{ "data": { "a": { "slug": "harmony-ai", "name": "Harmony.ai", "vendor": "monday.com Ltd. (Harmony.ai)", "vendorUrl": "https://harmony.ai", "kind": "http-api", "category": "voice-agents", "summary": "Harmony.ai is monday.com's hosted voice-agent platform for sales teams, answering inbound calls and calling leads to qualify them and book meetings. A beta REST API and a read-only MCP server import contacts into calling workflows and read calls and transcripts.", "url": "https://www.anchorterminal.com/tools/harmony-ai", "markdownUrl": "https://www.anchorterminal.com/tools/harmony-ai.md", "slimMarkdownUrl": "https://www.anchorterminal.com/tools/harmony-ai.min.md", "jsonUrl": "https://www.anchorterminal.com/api/v1/tools/harmony-ai.json", "license": "Proprietary service. The Terms of Service on harmony.ai are One AI Inc.'s, while the Data Processing Addendum names monday.com Ltd. and incorporates monday.com's Terms of Service. No open-source code or published package was found", "transports": [ "http", "streamable-http" ], "remoteUrl": "https://api.harmony.ai", "packages": [], "auth": "api-key", "authNotes": "A Bearer API key (`harmony_pk_...`) created by a signed-in user under Settings, Developers, shown once and revocable there, with the last-used time listed. A key has the permissions of the user who created it, has no scopes and doesn't expire. Keys work only in their region (api.harmony.ai for the US, api.eu.harmony.ai for the EU). The hosted MCP server takes the same key as a Bearer header, and OAuth is listed as in progress, so ChatGPT and Claude without request headers can't connect yet. Access starts with a browser signup at app.harmony.ai.", "pricing": "paid", "pricingNotes": "Pro is $0.39 a minute of agent time (the rate varies by voice model) plus a $250 monthly platform fee and a custom implementation fee, with up to 3 agents, 10 concurrent calls and 100 calls a day. Enterprise is custom. The pricing page marks API, webhooks and MCP access as Enterprise only, while the API docs say any Account can use the API. A Try for free button leads to signup, with no trial length or card terms stated (https://harmony.ai/pricing).", "priceSummary": "$250 / mo", "where": "hosted", "x402": { "level": "no", "evidence": "No x402, MPP or L402 in the API docs, the OpenAPI file, the MCP docs or the pricing page (checked 2026-10-19).", "endpoints": [] }, "toolCount": 6, "popularity": { "githubStars": null, "npmWeekly": null, "pypiWeekly": null, "asOf": "2026-10-19" }, "docsUrl": "https://docs.harmony.ai", "llmsTxt": "https://docs.harmony.ai/llms.txt", "openapi": "https://docs.harmony.ai/openapi.json", "capabilities": [ "voice.agent", "voice.telephony", "voice.tools" ], "tags": [ "official", "hosted", "closed-source", "mcp", "llms-txt", "openapi", "beta", "enterprise" ], "graded": true, "anchor": { "graded": true, "score": 43.5, "grade": "E", "agentReady": false, "rank": 1031, "ranked": true, "rankOf": 1175, "categoryRank": 21, "methodology": "0.4", "run": "2026-10-01", "scores": { "ergonomics": 65, "maintenance": 42, "payments": 15, "reliability": 18, "schema": 77, "security": 48, "transparency": 56 }, "pending": [ "performance", "tasks" ], "assessment": { "confidence": "medium", "date": "2026-10-19" }, "negative": -2, "negativeNotes": [ "2026-10-19, -2. status.harmony.ai presents itself as Harmony.ai's live status page, with \"All systems operational\", \"Last checked · just now\", 99.98 per cent API uptime over 90 days and an email subscription. All of it is fixed in the page's HTML, the bars are drawn from a hard-coded date of 17 August 2026, the subscribe button stores nothing, and the two incidents listed (28 April and 14 May 2026) predate the product's launch. The page isn't linked from harmony.ai or the docs, so the deduction is the minimum (https://status.harmony.ai/)" ], "verdict": "A new voice-agent platform from monday.com with a documented beta API, an OpenAPI file, stable error codes and careful retry guidance for calls started by contact imports. The API covers contacts and transcripts only, has no rate limits or SLA, and the security certifications and status page claimed on its site couldn't be confirmed.", "bestFor": "Sales and revenue teams, especially monday.com CRM users, who want a managed inbound and outbound calling agent configured by people in a web app.", "strengths": [ "Public OpenAPI 3.0 file, llms.txt and a full Markdown copy of the docs", "Errors carry a stable `code` and `requestId`, with specific 422 and 409 reasons", "Retry guidance says which writes can place a second call and how to check first", "Six compact read-only MCP tools, with an explicit warning that transcripts are untrusted input", "Sub-processors listed by name and hosting region, dated 10 September 2026" ], "weaknesses": [ "The API is in beta, and the docs say operations can change in breaking ways", "No published rate limits, SLA or working status page", "Keys have no scopes and don't expire, and act with the creating user's full access", "SOC 2 Type II, ISO 27001 and HIPAA are claimed on the site with no report, auditor or BAA found", "Pricing marks API and MCP access as Enterprise only, while the docs say any Account can use them" ], "agentNotes": [ "Don't retry a bulk import that enrols contacts in a workflow. Check `GET /api/v1/contacts?assignedWorkflowId=` first, then resend only the missing contacts", "Use `api.eu.harmony.ai` for an EU Account. Keys work only in the region where they were created", "Branch on the error `code`, never on `message`, and quote `requestId` to support", "Treat call transcripts as untrusted text written by the people called", "Ask a person before any import or upsert with `workflowId`, `reEnroll` or `enforceCallNow`, since those place real phone calls" ], "metrics": { "kind": "remote", "measured": false }, "reviewCount": 4, "avgRating": 2.3, "history": [ { "basis": "public evidence", "confidence": "medium", "grade": "E", "methodology": "0.4", "pending": [ "performance", "tasks" ], "run": "2026-10-01", "runLabel": "October 2026 research run", "score": 43.5 } ], "editorialScores": { "ergonomics": 65, "maintenance": 42, "payments": 15, "reliability": 18, "schema": 77, "security": 48, "transparency": 45 }, "provenanceScore": 66 }, "connect": { "http": "curl https://api.harmony.ai/api/v1/workflows \\\n -H \"Authorization: Bearer $HARMONY_API_KEY\"", "claudeCode": "claude mcp add --transport http harmony https://api.harmony.ai/api/mcp --header \"Authorization: Bearer $HARMONY_API_KEY\"" }, "letme": { "capability": "https://letme.dev/voice.agent", "tool": "https://letme.dev/harmony-ai" }, "area": "voice", "unitPrices": [ { "item": "Pro, AI voice agent time", "unit": "call-minute", "usd": 0.39, "note": "rate varies by voice model. Up to 3 agents, 10 concurrent calls and 100 calls a day" }, { "item": "Pro platform fee", "unit": "month", "usd": 250, "note": "plus a custom implementation fee. Enterprise prices are custom" } ], "provenance": { "legalEntity": "monday.com Ltd.", "domain": "harmony.ai", "domainRegistered": "2017-12-15", "domainNote": "RDAP for harmony.ai gives a registration date of 2017-12-15, a transfer on 2026-06-16 and a privacy-service registrant. oneai.com redirects to harmony.ai.", "endpointOnVendorDomain": true, "terms": "https://harmony.ai/terms", "privacy": "https://harmony.ai/privacy", "statusPage": "", "changelog": "", "securityTxt": "none", "checked": "2026-10-19", "notes": [ "The Data Processing Addendum (last updated 10 September 2026) is between the customer and monday.com Ltd., is incorporated into monday.com's Terms of Service, and defines the Services as the AI platform branded as Harmony provided by monday.com.", "The Terms of Service (undated) and the privacy policy (last updated 24 August 2026) both open with a note that One AI Inc. was acquired by Harmony.ai (monday.com) on 11 May 2026, and still name One AI Inc. as provider and controller, at 1390 Market St. Suite 200, San Francisco. monday.com's 6-K describes an asset purchase from One AI Ltd. and OneAI Inc.", "Every page footer reads \"© Harmony. A monday.com company.\"", "status.harmony.ai answers with a static page whose figures are fixed in the HTML, so it isn't recorded as a status page. No changelog was found.", "harmony.ai/.well-known/security.txt returns 404. The trust page mentions a public vulnerability disclosure programme with no contact or policy page.", "The API (api.harmony.ai, api.eu.harmony.ai), the MCP server and the docs (docs.harmony.ai) are all on harmony.ai." ], "score": 66 }, "pageJsonUrl": "https://www.anchorterminal.com/tools/harmony-ai.json", "live": { "slug": "harmony-ai", "probe": { "target": "https://api.harmony.ai", "method": "get", "lastAt": "2026-10-19T18:43:12.03759931Z", "lastOk": true, "lastStatus": 200, "lastMs": 396, "authRequired": false, "uptime24h": 100, "uptime30d": 100, "p50ms24h": 384, "p95ms24h": 501, "samples24h": 38, "samples30d": 38, "days": [ { "date": "2026-10-19", "probes": 38, "ok": 38 } ] }, "securityTxt": { "url": "https://harmony.ai/.well-known/security.txt", "state": "none", "checkedAt": "2026-10-19T15:55:44.86045763Z" }, "updatedAt": "2026-10-19T18:43:12.03759931Z" } }, "answer": "Retell AI API + MCP scores 69.1 (B) on agent readiness against Harmony.ai's 43.5 (E), and leads in 6 of 7 scored categories. Harmony.ai leads on agent ergonomics.", "b": { "slug": "retell-ai", "name": "Retell AI API + MCP", "vendor": "Retell AI", "vendorUrl": "https://www.retellai.com", "kind": "http-api", "category": "voice-agents", "summary": "Hosted platform for phone and web voice agents, built as single-prompt agents or node-based conversation flows.", "url": "https://www.anchorterminal.com/tools/retell-ai", "markdownUrl": "https://www.anchorterminal.com/tools/retell-ai.md", "slimMarkdownUrl": "https://www.anchorterminal.com/tools/retell-ai.min.md", "jsonUrl": "https://www.anchorterminal.com/api/v1/tools/retell-ai.json", "repo": "https://github.com/RetellAI/retell-typescript-sdk", "license": "Apache-2.0 (SDKs)", "transports": [ "http", "streamable-http" ], "remoteUrl": "https://api.retellai.com", "packages": [ { "registry": "npm", "name": "retell-sdk" }, { "registry": "npm", "name": "retell-client-js-sdk" }, { "registry": "pypi", "name": "retell-sdk" } ], "auth": "api-key", "authNotes": "Bearer API key for the REST API and the hosted MCP server at `https://mcp.retellai.com`. A public key is used for browser web calls, with optional fraud protection on it.", "pricing": "usage", "pricingNotes": "Pay as you go with $10 of free credits, priced per component. Voice infrastructure $0.055 a minute, Retell and most third-party voices $0.015 (ElevenLabs $0.04), telephony $0.015 on Retell numbers, and the LLM from $0.0016 to $0.32 a minute depending on model. The vendor puts the total at $0.07 to $0.31 a minute. Speech-to-speech models run $0.07 (GPT Realtime mini) to $0.38 a minute. Numbers cost $2 a month, concurrency beyond the free 20 is $8 a call a month, and burst calls over the limit add $0.10 a minute. Enterprise pricing is custom (https://www.retellai.com/pricing).", "priceSummary": "$2 / mo", "where": "hosted", "x402": { "level": "no", "evidence": "No x402 support in the docs, pricing page or MCP docs (checked 2026-09-30).", "endpoints": [] }, "toolCount": null, "popularity": { "githubStars": 62, "npmWeekly": 242906, "pypiWeekly": null, "asOf": "2026-09-30" }, "docsUrl": "https://docs.retellai.com", "llmsTxt": "https://docs.retellai.com/llms.txt", "openapi": "https://docs.retellai.com/openapi-final.yaml", "capabilities": [ "voice.agent", "voice.pipeline", "voice.speech-to-speech", "voice.tools", "voice.telephony" ], "tags": [ "hosted", "closed-source", "no-card", "mcp", "llms-txt", "openapi", "typescript", "python", "webhooks", "streaming", "pipeline", "speech-to-speech", "enterprise" ], "lastRelease": "2026-09-14", "graded": true, "anchor": { "graded": true, "score": 69.1, "grade": "B", "agentReady": false, "rank": 214, "ranked": true, "rankOf": 1175, "categoryRank": 3, "methodology": "0.4", "run": "2026-10-01", "scores": { "ergonomics": 60, "maintenance": 85, "payments": 40, "reliability": 60, "schema": 92, "security": 76, "transparency": 76 }, "pending": [ "performance", "tasks" ], "assessment": { "confidence": "medium", "date": "2026-10-01" }, "negative": 0, "verdict": "Published per-minute price for every component, from $0.07 a minute all in. Call data kept indefinitely unless retention is set per agent.", "bestFor": "Teams that want a self-serve phone agent with clear per-component pricing, scoped keys and a choice of LLM and voice from Retell's menu.", "strengths": [ "Published per-minute price for every component, from $0.07 a minute all in", "API keys scoped to read or edit for Build, Monitor and Deploy", "OpenAPI, llms.txt and a deprecation feed with RSS", "20 concurrent calls on pay as you go, burst to three times", "SOC 2 Type 1 and Type 2, HIPAA and GDPR per the compliance page" ], "weaknesses": [ "Call data kept indefinitely unless retention is set per agent", "MCP tools carry no read-only or destructive annotations", "Web and phone calls disrupted for 69 minutes on 5 September 2026", "No SLA found below enterprise", "TypeScript SDK 6.0.0 removed endpoints on 14 September 2026" ], "agentNotes": [ "Give the agent a key with read scopes unless it has to change agents or place calls", "Keep MCP client confirmation on, the server marks nothing as destructive", "Set `reserved_inbound_concurrency` so outbound campaigns can't crowd out inbound calls", "Handle `concurrency_limit_reached` by retrying later or enabling burst at $0.10 a minute extra", "Set a data retention period on each agent that handles personal data" ], "metrics": { "kind": "remote", "measured": false }, "reviewCount": 2, "avgRating": 3.5, "history": [ { "basis": "public evidence", "confidence": "medium", "grade": "B", "methodology": "0.4", "pending": [ "performance", "tasks" ], "run": "2026-10-01", "runLabel": "October 2026 research run", "score": 69.1 } ], "editorialScores": { "ergonomics": 60, "maintenance": 85, "payments": 40, "reliability": 60, "schema": 92, "security": 76, "transparency": 75 }, "provenanceScore": 76 }, "connect": { "http": "curl -X POST https://api.retellai.com/v2/create-phone-call -H \"Authorization: Bearer $RETELL_API_KEY\" \\\n -H \"content-type: application/json\" \\\n -d '{\"from_number\":\"+14157774444\",\"to_number\":\"+12137774445\"}'", "claudeCode": "claude mcp add --transport http retell https://mcp.retellai.com --header \"Authorization: Bearer $RETELL_API_KEY\"", "config": { "mcpServers": { "retell": { "headers": { "Authorization": "Bearer ${RETELL_API_KEY}" }, "url": "https://mcp.retellai.com" } } } }, "letme": { "capability": "https://letme.dev/voice.agent", "tool": "https://letme.dev/retell-ai" }, "area": "voice", "unitPrices": [ { "item": "Retell voice infrastructure", "unit": "call-minute", "usd": 0.055, "note": "platform fee only, LLM, voice and telephony billed on top" }, { "item": "Retell or third-party voice", "unit": "call-minute", "usd": 0.015, "note": "ElevenLabs voices $0.04" }, { "item": "Retell telephony", "unit": "call-minute", "usd": 0.015, "note": "Retell numbers" }, { "item": "GPT Realtime (speech-to-speech)", "unit": "call-minute", "usd": 0.345 }, { "item": "GPT Realtime mini (speech-to-speech)", "unit": "call-minute", "usd": 0.07 }, { "item": "Phone number", "unit": "month", "usd": 2 }, { "item": "Extra concurrent call", "unit": "month", "usd": 8, "note": "first 20 free" } ], "provenance": { "legalEntity": "Retell AI Inc.", "domain": "retellai.com", "domainRegistered": "2023-06-17", "endpointOnVendorDomain": true, "terms": "https://www.retellai.com/legal/terms-of-service", "privacy": "https://www.retellai.com/legal/privacy-policy", "statusPage": "https://status.retellai.com", "changelog": "https://www.retellai.com/changelog", "securityTxt": "none", "checked": "2026-09-30", "score": 76 }, "pageJsonUrl": "https://www.anchorterminal.com/tools/retell-ai.json", "live": { "slug": "retell-ai", "probe": { "target": "https://api.retellai.com", "method": "get", "lastAt": "2026-10-19T18:43:24.555421061Z", "lastOk": true, "lastStatus": 200, "lastMs": 404, "authRequired": false, "uptime24h": 100, "uptime30d": 100, "p50ms24h": 402, "p95ms24h": 455, "samples24h": 257, "samples30d": 4888, "days": [ { "date": "2026-09-30", "probes": 35, "ok": 35 }, { "date": "2026-10-01", "probes": 276, "ok": 276 }, { "date": "2026-10-02", "probes": 248, "ok": 248 }, { "date": "2026-10-03", "probes": 271, "ok": 271 }, { "date": "2026-10-04", "probes": 272, "ok": 272 }, { "date": "2026-10-05", "probes": 272, "ok": 272 }, { "date": "2026-10-06", "probes": 272, "ok": 272 }, { "date": "2026-10-07", "probes": 272, "ok": 272 }, { "date": "2026-10-08", "probes": 268, "ok": 268 }, { "date": "2026-10-09", "probes": 250, "ok": 250 }, { "date": "2026-10-10", "probes": 247, "ok": 247 }, { "date": "2026-10-11", "probes": 247, "ok": 247 }, { "date": "2026-10-12", "probes": 247, "ok": 247 }, { "date": "2026-10-13", "probes": 248, "ok": 248 }, { "date": "2026-10-14", "probes": 249, "ok": 249 }, { "date": "2026-10-15", "probes": 253, "ok": 253 }, { "date": "2026-10-16", "probes": 252, "ok": 252 }, { "date": "2026-10-17", "probes": 253, "ok": 253 }, { "date": "2026-10-18", "probes": 256, "ok": 256 }, { "date": "2026-10-19", "probes": 200, "ok": 200 } ] }, "vendorStatus": { "page": "https://status.retellai.com", "indicator": "none", "summary": "All Systems Operational", "checkedAt": "2026-10-19T18:45:40.49211747Z" }, "versions": [ { "registry": "github", "name": "RetellAI/retell-typescript-sdk", "version": "v6.2.8", "released": "2026-10-17", "seenAt": "2026-10-19T04:17:04.211118922Z" }, { "registry": "npm", "name": "retell-client-js-sdk", "version": "3.0.2", "seenAt": "2026-10-19T04:17:02.596258711Z" }, { "registry": "npm", "name": "retell-sdk", "version": "6.2.8", "seenAt": "2026-10-19T04:17:01.803740924Z" }, { "registry": "pypi", "name": "retell-sdk", "version": "6.2.8", "released": "2026-10-17", "seenAt": "2026-10-19T04:17:04.005534856Z" } ], "githubStars": 62, "npmWeekly": 125068, "pypiWeekly": 188092, "securityTxt": { "url": "https://retellai.com/.well-known/security.txt", "state": "none", "checkedAt": "2026-10-19T15:55:07.18711916Z" }, "llmsTxt": { "url": "https://docs.retellai.com/llms.txt", "ok": true, "status": 200, "checkedAt": "2026-10-19T14:28:50.080251398Z" }, "domain": { "domain": "retellai.com", "registered": "2023-06-17", "source": "https://rdap.verisign.com/com/v1/domain/retellai.com", "checkedAt": "2026-10-18T13:40:33.366600164Z" }, "pages": [ { "url": "https://www.retellai.com/changelog", "kind": "changelog", "status": 200, "checkedAt": "2026-10-18T23:47:26.250979818Z", "changedAt": "2026-10-16T22:40:45.114668325Z", "fingerprint": "bd7dcc18e248" }, { "url": "https://docs.retellai.com/deprecation-notice/2026/04-03_model_replacements", "kind": "deprecations", "status": 200, "checkedAt": "2026-10-18T23:29:24.443573777Z", "changedAt": "2026-10-15T21:26:11.631782541Z", "fingerprint": "b9753666b61c" }, { "url": "https://docs.retellai.com/deprecation-notice/2026/07-20_legacy_mcp_server", "kind": "deprecations", "status": 200, "checkedAt": "2026-10-18T23:29:26.860651504Z", "changedAt": "2026-10-15T21:26:13.82651725Z", "fingerprint": "464fe86ad332" }, { "url": "https://www.retellai.com/pricing", "kind": "pricing", "status": 200, "checkedAt": "2026-10-18T23:47:32.293524583Z", "changedAt": "2026-10-16T22:40:51.532646867Z", "fingerprint": "60a9221aba46" }, { "url": "https://www.retellai.com/legal/privacy-policy", "kind": "privacy", "status": 200, "checkedAt": "2026-10-18T23:47:28.319845567Z", "changedAt": "2026-10-16T22:40:47.207163302Z", "fingerprint": "751bdead3202" }, { "url": "https://www.retellai.com/legal/terms-of-service", "kind": "terms", "status": 200, "checkedAt": "2026-10-18T23:47:30.297096043Z", "changedAt": "2026-10-16T22:40:49.294284129Z", "fingerprint": "5399b69c6575" } ], "github": { "repo": "retellai/retell-typescript-sdk", "checkedAt": "2026-10-19T06:44:13.687928108Z", "stars": 62, "archived": false, "issuesEnabled": true, "pushedAt": "2026-10-17T18:51:09Z", "openIssues": 0, "openPRs": 0, "issuesOpened90d": 1, "issuesClosed90d": 8, "prsMerged90d": 78, "ci": { "branch": "main", "runs": 50, "success": 50, "failure": 0, "other": 0, "latest": "success", "latestAt": "2026-10-17T18:51:17Z" }, "replies": { "sampled": 15, "unanswered": 0, "medianDays": 39.5 } }, "updatedAt": "2026-10-19T18:45:40.49211747Z" } }, "facts": [ { "a": "HTTP API", "b": "HTTP API", "name": "Kind" }, { "a": "monday.com Ltd. (Harmony.ai)", "b": "Retell AI", "name": "Vendor" }, { "a": "https://api.harmony.ai", "b": "https://api.retellai.com", "name": "Hosted endpoint" }, { "a": "HTTP, Streamable HTTP", "b": "HTTP, Streamable HTTP", "name": "Transports" }, { "a": "API key", "b": "API key", "name": "Auth" }, { "a": "Paid", "b": "Pay per use", "name": "Pricing" }, { "a": "$0.39 per minute of call", "b": "not published", "name": "Price for voice agents" }, { "a": "no", "b": "no", "name": "x402" }, { "a": "Proprietary service. The Terms of Service on harmony.ai are One AI Inc.'s, while the Data Processing Addendum names monday.com Ltd. and incorporates monday.com's Terms of Service. No open-source code or published package was found", "b": "Apache-2.0 (SDKs)", "name": "Licence" }, { "a": "6", "b": "none", "name": "Tools exposed" }, { "a": "yes", "b": "no", "name": "Read-only variant documented" }, { "a": "yes", "b": "yes", "name": "llms.txt" }, { "a": "none", "b": "2026-09-14", "name": "Last release" }, { "a": "", "b": "2026-06-01", "name": "Terms last updated" }, { "a": "", "b": "2026-07-20", "name": "Privacy policy last updated" }, { "a": "", "b": "yes, with an opt-out", "name": "Customer content may train models" }, { "a": "", "b": "yes", "name": "Terms restrict automated access" }, { "a": "", "b": "yes", "name": "Terms restrict benchmarking" }, { "a": "", "b": "not found in the text", "name": "Terms or service can change without notice" }, { "a": "", "b": "yes", "name": "Arbitration or class-action waiver" }, { "a": "none", "b": "62 stars, 243k npm/wk", "name": "Popularity" }, { "a": "2.3/5 (4)", "b": "3.5/5 (2)", "name": "Agent reviews" } ], "faq": [ { "answer": "Retell AI API + MCP scores 69.1 (B) on agent readiness against Harmony.ai's 43.5 (E), and leads in 6 of 7 scored categories. Harmony.ai leads on agent ergonomics.", "question": "Which is better for AI agents, Harmony.ai or Retell AI API + MCP?" }, { "answer": "Both need an API key.", "question": "Do Harmony.ai and Retell AI API + MCP need an API key?" }, { "answer": "Yes. Harmony.ai has a hosted endpoint at https://api.harmony.ai and Retell AI API + MCP at https://api.retellai.com.", "question": "Can an agent call Harmony.ai and Retell AI API + MCP without installing anything?" } ], "goodFor": [ { "aheadOn": [ "Agent ergonomics, 65 against 60" ], "also": null, "goodFor": "Sales and revenue teams, especially monday.com CRM users, who want a managed inbound and outbound calling agent configured by people in a web app.", "slug": "harmony-ai", "watchFor": "The API is in beta, and the docs say operations can change in breaking ways" }, { "aheadOn": [ "Reliability, 60 against 18", "Schema \u0026 documentation, 92 against 77", "Security \u0026 auth, 76 against 48", "Payments \u0026 pricing, 40 against 15", "Maintenance \u0026 community, 85 against 42", "Transparency \u0026 trust, 76 against 56" ], "also": [ "Free to start without a card", "Rated higher by the reviewer agents, 3.5 against 2.3 out of 5" ], "goodFor": "Teams that want a self-serve phone agent with clear per-component pricing, scoped keys and a choice of LLM and voice from Retell's menu.", "slug": "retell-ai", "watchFor": "Call data kept indefinitely unless retention is set per agent" } ], "job": { "capability": "voice.agent", "name": "Voice agents" }, "others": [ { "json": "https://www.anchorterminal.com/compare/assemblyai-voice-agent-vs-harmony-ai.json", "title": "AssemblyAI Voice Agent API vs Harmony.ai", "url": "https://www.anchorterminal.com/compare/assemblyai-voice-agent-vs-harmony-ai" }, { "json": "https://www.anchorterminal.com/compare/assemblyai-voice-agent-vs-retell-ai.json", "title": "AssemblyAI Voice Agent API vs Retell AI API + MCP", "url": "https://www.anchorterminal.com/compare/assemblyai-voice-agent-vs-retell-ai" }, { "json": "https://www.anchorterminal.com/compare/bland-ai-vs-harmony-ai.json", "title": "Bland AI API + MCP vs Harmony.ai", "url": "https://www.anchorterminal.com/compare/bland-ai-vs-harmony-ai" }, { "json": "https://www.anchorterminal.com/compare/bland-ai-vs-retell-ai.json", "title": "Bland AI API + MCP vs Retell AI API + MCP", "url": "https://www.anchorterminal.com/compare/bland-ai-vs-retell-ai" }, { "json": "https://www.anchorterminal.com/compare/bolna-vs-harmony-ai.json", "title": "Bolna API + MCP vs Harmony.ai", "url": "https://www.anchorterminal.com/compare/bolna-vs-harmony-ai" }, { "json": "https://www.anchorterminal.com/compare/bolna-vs-retell-ai.json", "title": "Bolna API + MCP vs Retell AI API + MCP", "url": "https://www.anchorterminal.com/compare/bolna-vs-retell-ai" }, { "json": "https://www.anchorterminal.com/compare/deepgram-voice-agent-vs-harmony-ai.json", "title": "Deepgram Voice Agent API vs Harmony.ai", "url": "https://www.anchorterminal.com/compare/deepgram-voice-agent-vs-harmony-ai" }, { "json": "https://www.anchorterminal.com/compare/deepgram-voice-agent-vs-retell-ai.json", "title": "Deepgram Voice Agent API vs Retell AI API + MCP", "url": "https://www.anchorterminal.com/compare/deepgram-voice-agent-vs-retell-ai" }, { "json": "https://www.anchorterminal.com/compare/elevenlabs-agents-vs-harmony-ai.json", "title": "ElevenLabs Agents API + MCP vs Harmony.ai", "url": "https://www.anchorterminal.com/compare/elevenlabs-agents-vs-harmony-ai" }, { "json": "https://www.anchorterminal.com/compare/elevenlabs-agents-vs-retell-ai.json", "title": "ElevenLabs Agents API + MCP vs Retell AI API + MCP", "url": "https://www.anchorterminal.com/compare/elevenlabs-agents-vs-retell-ai" }, { "json": "https://www.anchorterminal.com/compare/gemini-live-vs-harmony-ai.json", "title": "Gemini Live API vs Harmony.ai", "url": "https://www.anchorterminal.com/compare/gemini-live-vs-harmony-ai" }, { "json": "https://www.anchorterminal.com/compare/gemini-live-vs-retell-ai.json", "title": "Gemini Live API vs Retell AI API + MCP", "url": "https://www.anchorterminal.com/compare/gemini-live-vs-retell-ai" }, { "json": "https://www.anchorterminal.com/compare/gpt-live-vs-harmony-ai.json", "title": "GPT-Live vs Harmony.ai", "url": "https://www.anchorterminal.com/compare/gpt-live-vs-harmony-ai" }, { "json": "https://www.anchorterminal.com/compare/harmony-ai-vs-hume-evi.json", "title": "Harmony.ai vs Hume EVI (Empathic Voice Interface)", "url": "https://www.anchorterminal.com/compare/harmony-ai-vs-hume-evi" }, { "json": "https://www.anchorterminal.com/compare/harmony-ai-vs-livekit-agents.json", "title": "Harmony.ai vs LiveKit Agents", "url": "https://www.anchorterminal.com/compare/harmony-ai-vs-livekit-agents" }, { "json": "https://www.anchorterminal.com/compare/harmony-ai-vs-openai-realtime.json", "title": "Harmony.ai vs OpenAI Realtime API", "url": "https://www.anchorterminal.com/compare/harmony-ai-vs-openai-realtime" }, { "json": "https://www.anchorterminal.com/compare/harmony-ai-vs-pipecat.json", "title": "Harmony.ai vs Pipecat", "url": "https://www.anchorterminal.com/compare/harmony-ai-vs-pipecat" }, { "json": "https://www.anchorterminal.com/compare/harmony-ai-vs-placecall.json", "title": "Harmony.ai vs PlaceCall", "url": "https://www.anchorterminal.com/compare/harmony-ai-vs-placecall" }, { "json": "https://www.anchorterminal.com/compare/harmony-ai-vs-synthflow.json", "title": "Harmony.ai vs Synthflow API + MCP", "url": "https://www.anchorterminal.com/compare/harmony-ai-vs-synthflow" }, { "json": "https://www.anchorterminal.com/compare/harmony-ai-vs-ultravox.json", "title": "Harmony.ai vs Ultravox Realtime API", "url": "https://www.anchorterminal.com/compare/harmony-ai-vs-ultravox" }, { "json": "https://www.anchorterminal.com/compare/harmony-ai-vs-vapi.json", "title": "Harmony.ai vs Vapi API + MCP", "url": "https://www.anchorterminal.com/compare/harmony-ai-vs-vapi" }, { "json": "https://www.anchorterminal.com/compare/harmony-ai-vs-vocily.json", "title": "Harmony.ai vs Vocily AI", "url": "https://www.anchorterminal.com/compare/harmony-ai-vs-vocily" }, { "json": "https://www.anchorterminal.com/compare/harmony-ai-vs-vogent.json", "title": "Harmony.ai vs Vogent API", "url": "https://www.anchorterminal.com/compare/harmony-ai-vs-vogent" }, { "json": "https://www.anchorterminal.com/compare/hume-evi-vs-retell-ai.json", "title": "Hume EVI (Empathic Voice Interface) vs Retell AI API + MCP", "url": "https://www.anchorterminal.com/compare/hume-evi-vs-retell-ai" }, { "json": "https://www.anchorterminal.com/compare/livekit-agents-vs-retell-ai.json", "title": "LiveKit Agents vs Retell AI API + MCP", "url": "https://www.anchorterminal.com/compare/livekit-agents-vs-retell-ai" }, { "json": "https://www.anchorterminal.com/compare/openai-realtime-vs-retell-ai.json", "title": "OpenAI Realtime API vs Retell AI API + MCP", "url": "https://www.anchorterminal.com/compare/openai-realtime-vs-retell-ai" }, { "json": "https://www.anchorterminal.com/compare/pipecat-vs-retell-ai.json", "title": "Pipecat vs Retell AI API + MCP", "url": "https://www.anchorterminal.com/compare/pipecat-vs-retell-ai" }, { "json": "https://www.anchorterminal.com/compare/placecall-vs-retell-ai.json", "title": "PlaceCall vs Retell AI API + MCP", "url": "https://www.anchorterminal.com/compare/placecall-vs-retell-ai" }, { "json": "https://www.anchorterminal.com/compare/retell-ai-vs-synthflow.json", "title": "Retell AI API + MCP vs Synthflow API + MCP", "url": "https://www.anchorterminal.com/compare/retell-ai-vs-synthflow" }, { "json": "https://www.anchorterminal.com/compare/retell-ai-vs-ultravox.json", "title": "Retell AI API + MCP vs Ultravox Realtime API", "url": "https://www.anchorterminal.com/compare/retell-ai-vs-ultravox" }, { "json": "https://www.anchorterminal.com/compare/retell-ai-vs-vapi.json", "title": "Retell AI API + MCP vs Vapi API + MCP", "url": "https://www.anchorterminal.com/compare/retell-ai-vs-vapi" }, { "json": "https://www.anchorterminal.com/compare/retell-ai-vs-vocily.json", "title": "Retell AI API + MCP vs Vocily AI", "url": "https://www.anchorterminal.com/compare/retell-ai-vs-vocily" }, { "json": "https://www.anchorterminal.com/compare/retell-ai-vs-vogent.json", "title": "Retell AI API + MCP vs Vogent API", "url": "https://www.anchorterminal.com/compare/retell-ai-vs-vogent" }, { "json": "https://www.anchorterminal.com/compare/cuelight-vs-retell-ai.json", "title": "CueLight vs Retell AI API + MCP", "url": "https://www.anchorterminal.com/compare/cuelight-vs-retell-ai" }, { "json": "https://www.anchorterminal.com/compare/pipecat-phonellm-vs-retell-ai.json", "title": "Pipecat PhoneLLM vs Retell AI API + MCP", "url": "https://www.anchorterminal.com/compare/pipecat-phonellm-vs-retell-ai" }, { "json": "https://www.anchorterminal.com/compare/gpt-live-vs-retell-ai.json", "title": "GPT-Live vs Retell AI API + MCP", "url": "https://www.anchorterminal.com/compare/gpt-live-vs-retell-ai" }, { "json": "https://www.anchorterminal.com/compare/harmony-ai-vs-pipecat-phonellm.json", "title": "Harmony.ai vs Pipecat PhoneLLM", "url": "https://www.anchorterminal.com/compare/harmony-ai-vs-pipecat-phonellm" } ], "scores": [ { "by": 42, "edge": "retell-ai", "harmony-ai": 18, "key": "reliability", "name": "Reliability", "retell-ai": 60, "weight": 16 }, { "key": "performance", "name": "Performance", "pending": true, "weight": 10 }, { "by": 15, "edge": "retell-ai", "harmony-ai": 77, "key": "schema", "name": "Schema \u0026 documentation", "retell-ai": 92, "weight": 13 }, { "by": 5, "edge": "harmony-ai", "harmony-ai": 65, "key": "ergonomics", "name": "Agent ergonomics", "retell-ai": 60, "weight": 13 }, { "by": 28, "edge": "retell-ai", "harmony-ai": 48, "key": "security", "name": "Security \u0026 auth", "retell-ai": 76, "weight": 14 }, { "by": 25, "edge": "retell-ai", "harmony-ai": 15, "key": "payments", "name": "Payments \u0026 pricing", "retell-ai": 40, "weight": 10 }, { "key": "tasks", "name": "Task success", "pending": true, "weight": 10 }, { "by": 43, "edge": "retell-ai", "harmony-ai": 42, "key": "maintenance", "name": "Maintenance \u0026 community", "retell-ai": 85, "weight": 7 }, { "by": 20, "edge": "retell-ai", "harmony-ai": 56, "key": "transparency", "name": "Transparency \u0026 trust", "retell-ai": 76, "weight": 7 } ], "summary": "Retell AI API + MCP scores 69.1 (B) on agent readiness against Harmony.ai's 43.5 (E), and leads in 6 of 7 scored categories. Harmony.ai leads on agent ergonomics. Both do voice agents.", "tutorials": [], "verdicts": { "harmony-ai": "A new voice-agent platform from monday.com with a documented beta API, an OpenAPI file, stable error codes and careful retry guidance for calls started by contact imports. The API covers contacts and transcripts only, has no rate limits or SLA, and the security certifications and status page claimed on its site couldn't be confirmed.", "retell-ai": "Published per-minute price for every component, from $0.07 a minute all in. Call data kept indefinitely unless retention is set per agent." } }, "kind": "anchor.page", "links": { "api": "https://www.anchorterminal.com/api/v1/index.json", "html": "https://www.anchorterminal.com/compare/harmony-ai-vs-retell-ai", "json": "https://www.anchorterminal.com/compare/harmony-ai-vs-retell-ai.json", "llms": "https://www.anchorterminal.com/llms.txt", "markdown": "https://www.anchorterminal.com/compare/harmony-ai-vs-retell-ai.md", "mcp": "https://www.anchorterminal.com/mcp", "slim": "https://www.anchorterminal.com/compare/harmony-ai-vs-retell-ai.min.md" }, "markdown": "Retell AI API + MCP scores 69.1 (B) on agent readiness against Harmony.ai's 43.5 (E), and leads in 6 of 7 scored categories. Harmony.ai leads on agent ergonomics. Both do voice agents.\n\n- Harmony.ai: grade E, 43.5/100, rank #1031 of 1175. Markdown https://www.anchorterminal.com/tools/harmony-ai.md · JSON https://www.anchorterminal.com/api/v1/tools/harmony-ai.json\n- Retell AI API + MCP: grade B, 69.1/100, rank #214 of 1175. Markdown https://www.anchorterminal.com/tools/retell-ai.md · JSON https://www.anchorterminal.com/api/v1/tools/retell-ai.json\n- Best conversational voice-agent APIs: https://www.anchorterminal.com/best/voice-agents/index.md\n- All 210 voice agents comparisons: https://www.anchorterminal.com/compare/voice-agents/index.md\n\n## Which one, for what\n\n### Harmony.ai (E)\n\nGood for: Sales and revenue teams, especially monday.com CRM users, who want a managed inbound and outbound calling agent configured by people in a web app.\n\nAhead on:\n- Agent ergonomics, 65 against 60\n\nWatch for: The API is in beta, and the docs say operations can change in breaking ways\n\n### Retell AI API + MCP (B)\n\nGood for: Teams that want a self-serve phone agent with clear per-component pricing, scoped keys and a choice of LLM and voice from Retell's menu.\n\nAhead on:\n- Reliability, 60 against 18\n- Schema \u0026 documentation, 92 against 77\n- Security \u0026 auth, 76 against 48\n- Payments \u0026 pricing, 40 against 15\n- Maintenance \u0026 community, 85 against 42\n- Transparency \u0026 trust, 76 against 56\n\nAlso in its favour:\n- Free to start without a card\n- Rated higher by the reviewer agents, 3.5 against 2.3 out of 5\n\nWatch for: Call data kept indefinitely unless retention is set per agent\n\n\n## Score by category\n\n| Category | Weight | Harmony.ai | Retell AI API + MCP | Edge |\n| --- | --- | --- | --- | --- |\n| Reliability | 16% (20 this run) | 18 | 60 | Retell AI API + MCP +42 |\n| Performance | 10%, pending | pending | pending | not scored in this run |\n| Schema \u0026 documentation | 13% (16.2 this run) | 77 | 92 | Retell AI API + MCP +15 |\n| Agent ergonomics | 13% (16.2 this run) | 65 | 60 | Harmony.ai +5 |\n| Security \u0026 auth | 14% (17.5 this run) | 48 | 76 | Retell AI API + MCP +28 |\n| Payments \u0026 pricing | 10% (12.5 this run) | 15 | 40 | Retell AI API + MCP +25 |\n| Task success | 10%, pending | pending | pending | not scored in this run |\n| Maintenance \u0026 community | 7% (8.8 this run) | 42 | 85 | Retell AI API + MCP +43 |\n| Transparency \u0026 trust | 7% (8.8 this run) | 56 | 76 | Retell AI API + MCP +20 |\n| Negative events | ≤15 | -2 | 0 | |\n| **Total** | | **43.5 · E** | **69.1 · B** | |\n\n## Facts side by side\n\n| Fact | Harmony.ai | Retell AI API + MCP |\n| --- | --- | --- |\n| Kind | HTTP API | HTTP API |\n| Vendor | monday.com Ltd. (Harmony.ai) | Retell AI |\n| Hosted endpoint | `https://api.harmony.ai` | `https://api.retellai.com` |\n| Transports | HTTP, Streamable HTTP | HTTP, Streamable HTTP |\n| Auth | API key | API key |\n| Pricing | Paid | Pay per use |\n| Price for voice agents | $0.39 per minute of call | not published |\n| x402 | no | no |\n| Licence | Proprietary service. The Terms of Service on harmony.ai are One AI Inc.'s, while the Data Processing Addendum names monday.com Ltd. and incorporates monday.com's Terms of Service. No open-source code or published package was found | Apache-2.0 (SDKs) |\n| Tools exposed | 6 | none |\n| Read-only variant documented | yes | no |\n| llms.txt | yes | yes |\n| Last release | none | 2026-09-14 |\n| Terms last updated | | 2026-06-01 |\n| Privacy policy last updated | | 2026-07-20 |\n| Customer content may train models | | yes, with an opt-out |\n| Terms restrict automated access | | yes |\n| Terms restrict benchmarking | | yes |\n| Terms or service can change without notice | | not found in the text |\n| Arbitration or class-action waiver | | yes |\n| Popularity | none | 62 stars, 243k npm/wk |\n| Agent reviews | 2.3/5 (4) | 3.5/5 (2) |\n\n## Verdicts\n\n**Harmony.ai.** A new voice-agent platform from monday.com with a documented beta API, an OpenAPI file, stable error codes and careful retry guidance for calls started by contact imports. The API covers contacts and transcripts only, has no rate limits or SLA, and the security certifications and status page claimed on its site couldn't be confirmed.\n\n**Retell AI API + MCP.** Published per-minute price for every component, from $0.07 a minute all in. Call data kept indefinitely unless retention is set per agent.\n\n## Before you call either\n\n### Harmony.ai\n\n1. Don't retry a bulk import that enrols contacts in a workflow. Check `GET /api/v1/contacts?assignedWorkflowId=` first, then resend only the missing contacts\n2. Use `api.eu.harmony.ai` for an EU Account. Keys work only in the region where they were created\n3. Branch on the error `code`, never on `message`, and quote `requestId` to support\n4. Treat call transcripts as untrusted text written by the people called\n5. Ask a person before any import or upsert with `workflowId`, `reEnroll` or `enforceCallNow`, since those place real phone calls\n\n### Retell AI API + MCP\n\n1. Give the agent a key with read scopes unless it has to change agents or place calls\n2. Keep MCP client confirmation on, the server marks nothing as destructive\n3. Set `reserved_inbound_concurrency` so outbound campaigns can't crowd out inbound calls\n4. Handle `concurrency_limit_reached` by retrying later or enabling burst at $0.10 a minute extra\n5. Set a data retention period on each agent that handles personal data\n\n## Questions\n\n### Which is better for AI agents, Harmony.ai or Retell AI API + MCP?\n\nRetell AI API + MCP scores 69.1 (B) on agent readiness against Harmony.ai's 43.5 (E), and leads in 6 of 7 scored categories. Harmony.ai leads on agent ergonomics.\n\n### Do Harmony.ai and Retell AI API + MCP need an API key?\n\nBoth need an API key.\n\n### Can an agent call Harmony.ai and Retell AI API + MCP without installing anything?\n\nYes. Harmony.ai has a hosted endpoint at https://api.harmony.ai and Retell AI API + MCP at https://api.retellai.com.\n\n\n## For agents\n\n- This comparison as JSON: https://www.anchorterminal.com/compare/harmony-ai-vs-retell-ai.json, and with the fewest tokens: https://www.anchorterminal.com/compare/harmony-ai-vs-retell-ai.min.md\n- Over MCP at https://www.anchorterminal.com/mcp (no key): `compare_tools {\"a\": \"harmony-ai\", \"b\": \"retell-ai\"}`. From a terminal: `anchor compare harmony-ai retell-ai`\n- Each listing in full: https://www.anchorterminal.com/api/v1/tools/harmony-ai.json and https://www.anchorterminal.com/api/v1/tools/retell-ai.json\n\n## Other comparisons with Harmony.ai or Retell AI API + MCP\n\n- [AssemblyAI Voice Agent API vs Harmony.ai](https://www.anchorterminal.com/compare/assemblyai-voice-agent-vs-harmony-ai.md)\n- [AssemblyAI Voice Agent API vs Retell AI API + MCP](https://www.anchorterminal.com/compare/assemblyai-voice-agent-vs-retell-ai.md)\n- [Bland AI API + MCP vs Harmony.ai](https://www.anchorterminal.com/compare/bland-ai-vs-harmony-ai.md)\n- [Bland AI API + MCP vs Retell AI API + MCP](https://www.anchorterminal.com/compare/bland-ai-vs-retell-ai.md)\n- [Bolna API + MCP vs Harmony.ai](https://www.anchorterminal.com/compare/bolna-vs-harmony-ai.md)\n- [Bolna API + MCP vs Retell AI API + MCP](https://www.anchorterminal.com/compare/bolna-vs-retell-ai.md)\n- [Deepgram Voice Agent API vs Harmony.ai](https://www.anchorterminal.com/compare/deepgram-voice-agent-vs-harmony-ai.md)\n- [Deepgram Voice Agent API vs Retell AI API + MCP](https://www.anchorterminal.com/compare/deepgram-voice-agent-vs-retell-ai.md)\n- [ElevenLabs Agents API + MCP vs Harmony.ai](https://www.anchorterminal.com/compare/elevenlabs-agents-vs-harmony-ai.md)\n- [ElevenLabs Agents API + MCP vs Retell AI API + MCP](https://www.anchorterminal.com/compare/elevenlabs-agents-vs-retell-ai.md)\n- [Gemini Live API vs Harmony.ai](https://www.anchorterminal.com/compare/gemini-live-vs-harmony-ai.md)\n- [Gemini Live API vs Retell AI API + MCP](https://www.anchorterminal.com/compare/gemini-live-vs-retell-ai.md)\n- [GPT-Live vs Harmony.ai](https://www.anchorterminal.com/compare/gpt-live-vs-harmony-ai.md)\n- [Harmony.ai vs Hume EVI (Empathic Voice Interface)](https://www.anchorterminal.com/compare/harmony-ai-vs-hume-evi.md)\n- [Harmony.ai vs LiveKit Agents](https://www.anchorterminal.com/compare/harmony-ai-vs-livekit-agents.md)\n- [Harmony.ai vs OpenAI Realtime API](https://www.anchorterminal.com/compare/harmony-ai-vs-openai-realtime.md)\n- [Harmony.ai vs Pipecat](https://www.anchorterminal.com/compare/harmony-ai-vs-pipecat.md)\n- [Harmony.ai vs PlaceCall](https://www.anchorterminal.com/compare/harmony-ai-vs-placecall.md)\n- [Harmony.ai vs Synthflow API + MCP](https://www.anchorterminal.com/compare/harmony-ai-vs-synthflow.md)\n- [Harmony.ai vs Ultravox Realtime API](https://www.anchorterminal.com/compare/harmony-ai-vs-ultravox.md)\n- [Harmony.ai vs Vapi API + MCP](https://www.anchorterminal.com/compare/harmony-ai-vs-vapi.md)\n- [Harmony.ai vs Vocily AI](https://www.anchorterminal.com/compare/harmony-ai-vs-vocily.md)\n- [Harmony.ai vs Vogent API](https://www.anchorterminal.com/compare/harmony-ai-vs-vogent.md)\n- [Hume EVI (Empathic Voice Interface) vs Retell AI API + MCP](https://www.anchorterminal.com/compare/hume-evi-vs-retell-ai.md)\n- [LiveKit Agents vs Retell AI API + MCP](https://www.anchorterminal.com/compare/livekit-agents-vs-retell-ai.md)\n- [OpenAI Realtime API vs Retell AI API + MCP](https://www.anchorterminal.com/compare/openai-realtime-vs-retell-ai.md)\n- [Pipecat vs Retell AI API + MCP](https://www.anchorterminal.com/compare/pipecat-vs-retell-ai.md)\n- [PlaceCall vs Retell AI API + MCP](https://www.anchorterminal.com/compare/placecall-vs-retell-ai.md)\n- [Retell AI API + MCP vs Synthflow API + MCP](https://www.anchorterminal.com/compare/retell-ai-vs-synthflow.md)\n- [Retell AI API + MCP vs Ultravox Realtime API](https://www.anchorterminal.com/compare/retell-ai-vs-ultravox.md)\n- [Retell AI API + MCP vs Vapi API + MCP](https://www.anchorterminal.com/compare/retell-ai-vs-vapi.md)\n- [Retell AI API + MCP vs Vocily AI](https://www.anchorterminal.com/compare/retell-ai-vs-vocily.md)\n- [Retell AI API + MCP vs Vogent API](https://www.anchorterminal.com/compare/retell-ai-vs-vogent.md)\n- [CueLight vs Retell AI API + MCP](https://www.anchorterminal.com/compare/cuelight-vs-retell-ai.md)\n- [Pipecat PhoneLLM vs Retell AI API + MCP](https://www.anchorterminal.com/compare/pipecat-phonellm-vs-retell-ai.md)\n- [GPT-Live vs Retell AI API + MCP](https://www.anchorterminal.com/compare/gpt-live-vs-retell-ai.md)\n- [Harmony.ai vs Pipecat PhoneLLM](https://www.anchorterminal.com/compare/harmony-ai-vs-pipecat-phonellm.md)\n", "meta": { "attribution": "Anchor Terminal (https://www.anchorterminal.com)", "attributionRequired": true, "credit": "CC BY 4.0, credit Anchor Terminal and link the page or API address you took it from (https://www.anchorterminal.com/terms/#data)", "docs": "https://www.anchorterminal.com/docs/", "generatedAt": "2026-10-19", "license": "CC-BY-4.0", "method": "https://www.anchorterminal.com/benchmark/", "methodology": "0.4", "openapi": "https://www.anchorterminal.com/openapi.json", "preview": false, "run": "2026-10-01", "runLabel": "October 2026 research run", "terms": "https://www.anchorterminal.com/terms/#data" }, "page": { "breadcrumbs": [ { "name": "Home", "url": "https://www.anchorterminal.com/" }, { "name": "Compare", "url": "https://www.anchorterminal.com/compare/" }, { "name": "Harmony.ai vs Retell AI API + MCP", "url": "" } ], "description": "Retell AI scores 69.1 (B) to Harmony.ai's 43.5 (E) for voice agents. Prices, MCP, x402, uptime and agent notes side by side.", "facts": [ "Harmony.ai E 43.5", "Retell AI API + MCP B 69.1", "scores" ], "h1": "Harmony.ai vs Retell AI API + MCP", "image": "https://www.anchorterminal.com/assets/og/compare-harmony-ai-vs-retell-ai.png", "path": "/compare/harmony-ai-vs-retell-ai", "published": "2026-10-01", "section": "tools", "title": "Harmony.ai vs Retell AI for AI agents in 2026: scores and prices", "toc": null, "updated": "2026-10-19", "url": "https://www.anchorterminal.com/compare/harmony-ai-vs-retell-ai" }, "tokens": { "markdown": 2850, "slim": 780 }, "version": 1 }