{ "data": { "a": { "slug": "azure-text-to-speech", "name": "Azure AI Speech text-to-speech", "vendor": "Microsoft", "vendorUrl": "https://azure.microsoft.com/en-us/products/ai-services/text-to-speech", "kind": "model", "category": "text-to-speech", "summary": "Azure's text-to-speech service for generating spoken audio.", "url": "https://www.anchorterminal.com/tools/azure-text-to-speech", "markdownUrl": "https://www.anchorterminal.com/tools/azure-text-to-speech.md", "slimMarkdownUrl": "https://www.anchorterminal.com/tools/azure-text-to-speech.min.md", "jsonUrl": "https://www.anchorterminal.com/api/v1/tools/azure-text-to-speech.json", "repo": "https://github.com/Azure-Samples/cognitive-services-speech-sdk", "license": "MIT (samples), SDK under Microsoft's own licence", "transports": [ "http" ], "remoteUrl": "https://eastus.tts.speech.microsoft.com/cognitiveservices", "packages": [ { "registry": "pypi", "name": "azure-cognitiveservices-speech" }, { "registry": "npm", "name": "microsoft-cognitiveservices-speech-sdk" } ], "auth": "mixed", "authNotes": "`Ocp-Apim-Subscription-Key` header with a Speech resource key, or a Microsoft Entra ID bearer token. Endpoints are per region.", "pricing": "freemium", "pricingNotes": "Free F0 tier with 500,000 characters a month. Pay as you go in East US is $15 per 1M characters for Neural and Neural HD Flash voices and $22 for Neural HD, real time or batch. Commitment tiers from $960 a month for 80M characters (https://azure.microsoft.com/en-us/pricing/details/speech/). Microsoft AI lists MAI-Voice-2.1 at $22 and MAI-Voice-2.1-Flash at $15 per 1M characters in preview (https://microsoft.ai/models/mai-voice-2-1/).", "priceSummary": "$960 / mo", "where": "hosted", "x402": { "level": "no", "evidence": "No machine payment. Billing runs through a cloud account with a card or invoice.", "endpoints": [] }, "toolCount": null, "popularity": { "githubStars": 3450, "npmWeekly": 475621, "pypiWeekly": 1032532, "asOf": "2026-09-30" }, "docsUrl": "https://learn.microsoft.com/en-us/azure/ai-services/speech-service/text-to-speech", "capabilities": [ "speech.tts", "speech.streaming", "speech.voices", "speech.ssml", "speech.languages" ], "tags": [ "hosted", "freemium", "free-tier", "closed-source", "python", "typescript", "enterprise", "streaming", "batch", "async-jobs" ], "lastRelease": "2026-10-01", "graded": true, "anchor": { "graded": true, "score": 71.4, "grade": "BB", "agentReady": true, "rank": 125, "ranked": true, "rankOf": 961, "categoryRank": 4, "methodology": "0.4", "run": "2026-10-01", "scores": { "ergonomics": 75, "maintenance": 80, "payments": 20, "reliability": 80, "schema": 65, "security": 90, "transparency": 85 }, "pending": [ "performance", "tasks" ], "assessment": { "confidence": "medium", "date": "2026-10-05" }, "negative": 0, "verdict": "Real-time synthesis keeps neither the input text nor the output audio. An Azure subscription needs a card, even for the free F0 tier.", "bestFor": "Operators on Azure who need SSML control, many languages and voices, and enterprise access control.", "strengths": [ "Real-time synthesis keeps neither the input text nor the output audio", "Full SSML with speaking styles, prosody, phonemes, lexicons and up to 50 voice or audio tags a request", "Microsoft Entra ID with role-based access, or two rotatable keys", "Covered by Microsoft's online services SLA", "S0 starts at 30 requests a second and can be raised to 1,000" ], "weaknesses": [ "An Azure subscription needs a card, even for the free F0 tier", "No llms.txt and no OpenAPI file for text-to-speech found", "429s often reflect busy capacity for a voice in a region, which a quota increase doesn't fix", "The voice list comes back as one response per region with no paging documented", "MAI-Voice-2.1 and MAI-Voice-2.1-Flash, Microsoft's newest models, are public preview with no SLA" ], "agentNotes": [ "Send SSML with `\u003cspeak\u003e` and `\u003cvoice\u003e`, and set `X-Microsoft-OutputFormat` and `User-Agent`.", "On 429 retry with backoff, and try the voice's home region or another region rather than asking for more quota.", "Keep each real-time request under 10 minutes of audio, or use batch synthesis.", "Use Entra ID tokens instead of resource keys where the agent runs inside Azure.", "Name a MAI voice with its model suffix, such as `en-US-Harper:MAI-Voice-2.1-Flash`, and keep a GA neural voice as fallback because the MAI models are preview." ], "metrics": { "kind": "remote", "measured": false }, "reviewCount": 2, "avgRating": 3.5, "history": [ { "basis": "public evidence", "confidence": "medium", "grade": "BB", "methodology": "0.4", "pending": [ "performance", "tasks" ], "run": "2026-10-01", "runLabel": "October 2026 research run", "score": 71.4 } ], "editorialScores": { "ergonomics": 75, "maintenance": 80, "payments": 20, "reliability": 80, "schema": 65, "security": 90, "transparency": 80 }, "provenanceScore": 90 }, "connect": { "install": "pip install azure-cognitiveservices-speech # or: npm i microsoft-cognitiveservices-speech-sdk", "http": "curl -X POST \"https://eastus.tts.speech.microsoft.com/cognitiveservices/v1\" \\\n -H \"Ocp-Apim-Subscription-Key: $AZURE_SPEECH_KEY\" -H \"Content-Type: application/ssml+xml\" \\\n -H \"X-Microsoft-OutputFormat: audio-24khz-48kbitrate-mono-mp3\" -o speech.mp3 \\\n -d '\u003cspeak version=\"1.0\" xml:lang=\"en-US\"\u003e\u003cvoice name=\"en-US-AvaMultilingualNeural\"\u003eYour table is booked for seven.\u003c/voice\u003e\u003c/speak\u003e'" }, "letme": { "capability": "https://letme.dev/speech.tts", "tool": "https://letme.dev/azure-text-to-speech" }, "sameCompany": [ "azure-foundry-fine-tuning", "azure-ai-content-safety", "azure-speech-to-text", "microsoft-agent-framework", "microsoft-execution-containers", "microsoft-entra-agent-id", "azure-key-vault", "azure-document-intelligence", "azure-devops-mcp", "microsoft-learn-mcp", "playwright-mcp", "azure-mcp", "azure-maps", "azure-translator", "microsoft-graph-calendar", "azure-blob-storage", "onedrive-sharepoint", "microsoft-teams", "dynamics-365-sales", "power-automate", "foundry-local", "microsoft-decision-1", "microsoft-advertising-api", "microsoft-excel-graph", "outlook-mail-graph" ], "area": "voice", "unitPrices": [ { "item": "Neural and Neural HD Flash voices", "unit": "1m-chars", "usd": 15, "note": "real time or batch, East US" }, { "item": "Neural HD voices", "unit": "1m-chars", "usd": 22 }, { "item": "Commitment tier 80M characters", "unit": "month", "usd": 960, "note": "$12 per 1M overage" } ], "provenance": { "legalEntity": "Microsoft Corporation", "domain": "microsoft.com", "domainRegistered": "1991-05-02", "domainNote": "Endpoints are on speech.microsoft.com, api.cognitive.microsoft.com and cognitiveservices.azure.com. microsoft.com publishes a security.txt, but it passed its Expires date on 2026-09-23.", "endpointOnVendorDomain": true, "terms": "https://www.microsoft.com/licensing/terms/", "privacy": "https://privacy.microsoft.com/en-us/privacystatement", "statusPage": "https://azure.status.microsoft/en-us/status", "changelog": "https://learn.microsoft.com/en-us/azure/ai-services/speech-service/releasenotes", "securityTxt": "expired", "checked": "2026-09-30", "score": 90 }, "pageJsonUrl": "https://www.anchorterminal.com/tools/azure-text-to-speech.json", "live": { "slug": "azure-text-to-speech", "probe": { "target": "https://eastus.tts.speech.microsoft.com/cognitiveservices", "method": "get", "lastAt": "2026-10-11T02:46:17.774333384Z", "lastOk": true, "lastStatus": 404, "lastMs": 257, "authRequired": false, "uptime24h": 100, "uptime30d": 100, "p50ms24h": 257, "p95ms24h": 291, "samples24h": 248, "samples30d": 2712, "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": 29, "ok": 29 } ] }, "versions": [ { "registry": "github", "name": "Azure-Samples/cognitive-services-speech-sdk", "version": "ingestion-v2.1.13", "released": "2026-07-10", "seenAt": "2026-10-10T17:35:57.932268315Z" }, { "registry": "npm", "name": "microsoft-cognitiveservices-speech-sdk", "version": "1.52.0", "seenAt": "2026-10-10T17:35:57.848799787Z" }, { "registry": "pypi", "name": "azure-cognitiveservices-speech", "version": "1.52.0", "released": "2026-09-28", "seenAt": "2026-10-10T17:35:57.729713176Z" } ], "githubStars": 3452, "npmWeekly": 466694, "pypiWeekly": 715917, "securityTxt": { "url": "https://microsoft.com/.well-known/security.txt", "state": "expired", "expires": "2026-09-23T16:00:00.000Z", "checkedAt": "2026-10-10T15:40:52.555008839Z" }, "domain": { "domain": "microsoft.com", "registered": "1991-05-02", "source": "https://rdap.verisign.com/com/v1/domain/microsoft.com", "checkedAt": "2026-10-04T13:04:13.488857536Z" }, "updatedAt": "2026-10-11T02:46:17.774333384Z" } }, "answer": "Azure AI Speech text-to-speech and HeyGen Voice score within a point of each other on agent readiness, 71.4 (BB) and 71.3 (BB). HeyGen Voice leads on schema \u0026 documentation, agent ergonomics and payments \u0026 pricing.", "b": { "slug": "heygen-voice", "name": "HeyGen Voice", "vendor": "HeyGen", "vendorUrl": "https://www.heygen.com", "kind": "model", "category": "text-to-speech", "summary": "HeyGen Voice is HeyGen's in-house text-to-speech model, `heygen-voice-1`, which speaks text in a voice cloned from one recording (instant) or from 20 minutes or more (professional), through HeyGen's v3 API.", "url": "https://www.anchorterminal.com/tools/heygen-voice", "markdownUrl": "https://www.anchorterminal.com/tools/heygen-voice.md", "slimMarkdownUrl": "https://www.anchorterminal.com/tools/heygen-voice.min.md", "jsonUrl": "https://www.anchorterminal.com/api/v1/tools/heygen-voice.json", "license": "Closed service under HeyGen's Terms of Service (HeyGen Technology, Inc., last updated 23 July 2026).", "transports": [ "http" ], "remoteUrl": "https://api.heygen.com", "packages": [], "auth": "api-key", "authNotes": "An API key from the HeyGen API dashboard, sent in the X-Api-Key header. Keys can be restricted to read and write scopes, and the speech and voice endpoints need voices:write. The OpenAPI file also accepts an OAuth bearer token, which bills subscription credits. Stripe Projects can provision a key through the operator's Stripe account.", "pricing": "usage", "pricingNotes": "Instant-voice speech is $15 per million submitted characters, charged only on successful requests (OpenAPI description, checked 10 October 2026). Professional speech is 0.6 API credits per generated minute, and each professional voice needs a purchased slot. Instant voices are free to create during the preview. No free API allowance was found.", "priceSummary": "Pay per use", "where": "hosted", "x402": { "level": "no", "evidence": "No x402, MPP or L402 in the developer llms.txt, the OpenAPI file or the HeyGen Voice pages, checked 10 October 2026. Keys are funded by API credit or through Stripe Projects.", "endpoints": [] }, "toolCount": null, "popularity": { "githubStars": null, "npmWeekly": null, "pypiWeekly": null, "asOf": "2026-10-10" }, "docsUrl": "https://developers.heygen.com/docs/models/heygen-voice", "llmsTxt": "https://developers.heygen.com/llms.txt", "openapi": "https://developers.heygen.com/openapi/external-api.json", "capabilities": [ "speech.tts", "speech.streaming", "speech.languages", "voice.clone" ], "tags": [ "hosted", "official", "usage-priced", "closed-source", "openapi", "llms-txt", "streaming", "status-page", "soc2", "security-txt", "cli", "agent-skills" ], "graded": true, "anchor": { "graded": true, "score": 71.3, "grade": "BB", "agentReady": true, "rank": 131, "ranked": true, "rankOf": 961, "categoryRank": 5, "methodology": "0.4", "run": "2026-10-01", "scores": { "ergonomics": 83, "maintenance": 65, "payments": 30, "reliability": 75, "schema": 94, "security": 69, "transparency": 69 }, "pending": [ "performance", "tasks" ], "assessment": { "confidence": "medium", "date": "2026-10-10" }, "negative": 0, "verdict": "HeyGen Voice has a typed OpenAPI contract, streaming with character timestamps, and a published price of $15 per million characters for instant voices, with failed requests not charged. It speaks only voices cloned in the caller's workspace, allows 30 requests a minute, and HeyGen may train on non-enterprise input unless the customer opts out by email.", "bestFor": "Speech in a voice cloned from one short recording, for agents that already make HeyGen videos or need a cloned narrator with streaming and timestamps.", "strengths": [ "OpenAPI 3.1 file with enums, ranges, `additionalProperties: false` and per-code errors for every speech and voice endpoint", "Streaming over Server-Sent Events, with optional character-level timestamps", "Instant-voice speech priced at $15 per million characters without a login, and failed or disconnected requests are not charged", "API keys can be restricted to read and write scopes, and the speech endpoints need voices:write", "Instant voices are created from one recording, usually ready within seconds, in 39 base languages" ], "weaknesses": [ "Speaks only voices cloned in the caller's workspace. Stock and designed voices go through a separate endpoint and engines", "30 requests a minute per workspace member on the speech endpoints, on every plan", "Output is a 44.1 kHz mono WAV only, and text is capped at 5,000 characters a request", "HeyGen's privacy policy allows training on user input, with an opt-out by email. Enterprise data is excluded by default", "No official SDK, no free API allowance and no SLA in the terms" ], "agentNotes": [ "Create a voice first with POST /v3/models/audio/voices and `mode`, then poll GET /v3/models/audio/voices/{voice_id} until `status` is ACTIVE before calling speech", "Send `expressiveness_boost` only for instant voices and `seed`, `speed`, `pitch_shift`, `pitch_variance` or `\u003cbreak\u003e` tags only for professional voices. Mixing them returns 400 invalid_parameter", "On the stream, decode and play each base64 WAV part in `part_index` order. Do not concatenate the bytes", "Send an Idempotency-Key when creating a voice, and retry 502, 503 and 504 on speech, which the OpenAPI file marks as safe", "Use POST /v3/voices/speech for stock or designed voices. It is a different engine and price" ], "metrics": { "kind": "remote", "measured": false }, "reviewCount": 0, "avgRating": 0, "history": [ { "basis": "public evidence", "confidence": "medium", "grade": "BB", "methodology": "0.4", "pending": [ "performance", "tasks" ], "run": "2026-10-01", "runLabel": "October 2026 research run", "score": 71.3 } ], "editorialScores": { "ergonomics": 83, "maintenance": 65, "payments": 30, "reliability": 75, "schema": 94, "security": 69, "transparency": 52 }, "provenanceScore": 85 }, "connect": { "http": "curl -X POST \"https://api.heygen.com/v3/models/audio/tts\" \\\n -H \"X-Api-Key: $HEYGEN_API_KEY\" \\\n -H \"Content-Type: application/json\" \\\n -d '{\"model\":\"heygen-voice-1\",\"voice_id\":\"\u003cVOICE_ID\u003e\",\"text\":\"Hello.\",\"language\":\"en\",\"expressiveness_boost\":0.8}'" }, "letme": { "capability": "https://letme.dev/speech.tts", "tool": "https://letme.dev/heygen-voice" }, "area": "voice", "unitPrices": [ { "item": "Instant-voice speech", "unit": "1m-chars", "usd": 15, "note": "Submitted Unicode characters, including spaces. Successful requests only." }, { "item": "Professional-voice speech", "unit": "audio-minute", "usd": 0.6, "note": "0.6 API credits per generated minute. The dollar figure assumes $1 a credit, from the OpenAPI example of 9/60 credit for $0.15." } ], "provenance": { "legalEntity": "HeyGen Technology, Inc.", "domain": "heygen.com", "domainRegistered": "", "endpointOnVendorDomain": true, "terms": "https://www.heygen.com/terms", "privacy": "https://www.heygen.com/privacy", "statusPage": "https://status.heygen.com", "changelog": "https://developers.heygen.com/changelog", "securityTxt": "valid", "checked": "2026-10-10", "notes": [ "security.txt at www.heygen.com/.well-known/security.txt names security@heygen.com and expires on 31 December 2026.", "The privacy policy names HeyGen Technology Inc. in section 1 and HeyGen, Inc. as processor in section 15.", "The status page has components per domain (www, app, api) and none for voice.", "Domain registration date was not checked." ], "score": 85 }, "pageJsonUrl": "https://www.anchorterminal.com/tools/heygen-voice.json", "live": { "slug": "heygen-voice", "probe": { "target": "https://api.heygen.com", "method": "get", "lastAt": "2026-10-11T02:46:27.941825924Z", "lastOk": true, "lastStatus": 404, "lastMs": 308, "authRequired": false, "uptime24h": 100, "uptime30d": 100, "p50ms24h": 301, "p95ms24h": 320, "samples24h": 30, "samples30d": 30, "days": [ { "date": "2026-10-10", "probes": 1, "ok": 1 }, { "date": "2026-10-11", "probes": 29, "ok": 29 } ] }, "vendorStatus": { "page": "https://status.heygen.com", "indicator": "none", "summary": "All Systems Operational", "checkedAt": "2026-10-11T02:40:57.349304573Z" }, "updatedAt": "2026-10-11T02:46:27.941825924Z" } }, "facts": [ { "a": "Model API", "b": "Model API", "name": "Kind" }, { "a": "Microsoft", "b": "HeyGen", "name": "Vendor" }, { "a": "https://eastus.tts.speech.microsoft.com/cognitiveservices", "b": "https://api.heygen.com", "name": "Hosted endpoint" }, { "a": "HTTP", "b": "HTTP", "name": "Transports" }, { "a": "OAuth or key", "b": "API key", "name": "Auth" }, { "a": "Freemium", "b": "Pay per use", "name": "Pricing" }, { "a": "no", "b": "no", "name": "x402" }, { "a": "MIT (samples), SDK under Microsoft's own licence", "b": "Closed service under HeyGen's Terms of Service (HeyGen Technology, Inc., last updated 23 July 2026).", "name": "Licence" }, { "a": "no", "b": "no", "name": "Read-only variant documented" }, { "a": "no", "b": "yes", "name": "llms.txt" }, { "a": "2026-10-01", "b": "none", "name": "Last release" }, { "a": "couldn't be read", "b": "", "name": "Terms last updated" }, { "a": "2026-09-01", "b": "", "name": "Privacy policy last updated" }, { "a": "yes", "b": "", "name": "Customer content may train models" }, { "a": "couldn't be read", "b": "", "name": "Terms restrict automated access" }, { "a": "couldn't be read", "b": "", "name": "Terms restrict benchmarking" }, { "a": "couldn't be read", "b": "", "name": "Terms or service can change without notice" }, { "a": "couldn't be read", "b": "", "name": "Arbitration or class-action waiver" }, { "a": "3.5k stars, 476k npm/wk, 1M PyPI/wk", "b": "none", "name": "Popularity" }, { "a": "3.5/5 (2)", "b": "none", "name": "Agent reviews" } ], "faq": [ { "answer": "Azure AI Speech text-to-speech and HeyGen Voice score within a point of each other on agent readiness, 71.4 (BB) and 71.3 (BB). HeyGen Voice leads on schema \u0026 documentation, agent ergonomics and payments \u0026 pricing.", "question": "Which is better for AI agents, Azure AI Speech text-to-speech or HeyGen Voice?" }, { "answer": "Azure AI Speech text-to-speech takes an API key or an OAuth sign-in. HeyGen Voice needs an API key.", "question": "Do Azure AI Speech text-to-speech and HeyGen Voice need an API key?" }, { "answer": "Yes. Azure AI Speech text-to-speech has a hosted endpoint at https://eastus.tts.speech.microsoft.com/cognitiveservices and HeyGen Voice at https://api.heygen.com.", "question": "Can an agent call Azure AI Speech text-to-speech and HeyGen Voice without installing anything?" } ], "goodFor": [ { "aheadOn": [ "Reliability, 80 against 75", "Security \u0026 auth, 90 against 69", "Maintenance \u0026 community, 80 against 65", "Transparency \u0026 trust, 85 against 69" ], "also": null, "goodFor": "Operators on Azure who need SSML control, many languages and voices, and enterprise access control.", "slug": "azure-text-to-speech", "watchFor": "An Azure subscription needs a card, even for the free F0 tier" }, { "aheadOn": [ "Schema \u0026 documentation, 94 against 65", "Agent ergonomics, 83 against 75", "Payments \u0026 pricing, 30 against 20" ], "also": null, "goodFor": "Speech in a voice cloned from one short recording, for agents that already make HeyGen videos or need a cloned narrator with streaming and timestamps.", "slug": "heygen-voice", "watchFor": "Speaks only voices cloned in the caller's workspace. Stock and designed voices go through a separate endpoint and engines" } ], "job": { "capability": "speech.tts", "name": "Text-to-speech" }, "others": [ { "json": "https://www.anchorterminal.com/compare/amazon-polly-vs-azure-text-to-speech.json", "title": "Amazon Polly vs Azure AI Speech text-to-speech", "url": "https://www.anchorterminal.com/compare/amazon-polly-vs-azure-text-to-speech" }, { "json": "https://www.anchorterminal.com/compare/amazon-polly-vs-heygen-voice.json", "title": "Amazon Polly vs HeyGen Voice", "url": "https://www.anchorterminal.com/compare/amazon-polly-vs-heygen-voice" }, { "json": "https://www.anchorterminal.com/compare/azure-text-to-speech-vs-cartesia-tts.json", "title": "Azure AI Speech text-to-speech vs Cartesia Sonic TTS API + MCP", "url": "https://www.anchorterminal.com/compare/azure-text-to-speech-vs-cartesia-tts" }, { "json": "https://www.anchorterminal.com/compare/azure-text-to-speech-vs-deepgram-tts.json", "title": "Azure AI Speech text-to-speech vs Deepgram Text-to-Speech (Aura-2, Flux TTS)", "url": "https://www.anchorterminal.com/compare/azure-text-to-speech-vs-deepgram-tts" }, { "json": "https://www.anchorterminal.com/compare/azure-text-to-speech-vs-elevenlabs-tts.json", "title": "Azure AI Speech text-to-speech vs ElevenLabs Text to Speech API + MCP", "url": "https://www.anchorterminal.com/compare/azure-text-to-speech-vs-elevenlabs-tts" }, { "json": "https://www.anchorterminal.com/compare/azure-text-to-speech-vs-fish-audio-tts.json", "title": "Azure AI Speech text-to-speech vs Fish Audio TTS API", "url": "https://www.anchorterminal.com/compare/azure-text-to-speech-vs-fish-audio-tts" }, { "json": "https://www.anchorterminal.com/compare/azure-text-to-speech-vs-murf-tts.json", "title": "Azure AI Speech text-to-speech vs Murf TTS API + MCP", "url": "https://www.anchorterminal.com/compare/azure-text-to-speech-vs-murf-tts" }, { "json": "https://www.anchorterminal.com/compare/azure-text-to-speech-vs-playht-tts.json", "title": "Azure AI Speech text-to-speech vs PlayHT Text-to-Speech API", "url": "https://www.anchorterminal.com/compare/azure-text-to-speech-vs-playht-tts" }, { "json": "https://www.anchorterminal.com/compare/azure-text-to-speech-vs-resemble-ai-tts.json", "title": "Azure AI Speech text-to-speech vs Resemble AI Text-to-Speech API", "url": "https://www.anchorterminal.com/compare/azure-text-to-speech-vs-resemble-ai-tts" }, { "json": "https://www.anchorterminal.com/compare/azure-text-to-speech-vs-rime-tts.json", "title": "Azure AI Speech text-to-speech vs Rime TTS API + MCP", "url": "https://www.anchorterminal.com/compare/azure-text-to-speech-vs-rime-tts" }, { "json": "https://www.anchorterminal.com/compare/azure-text-to-speech-vs-soniox-tts.json", "title": "Azure AI Speech text-to-speech vs Soniox Text-to-Speech", "url": "https://www.anchorterminal.com/compare/azure-text-to-speech-vs-soniox-tts" }, { "json": "https://www.anchorterminal.com/compare/cartesia-tts-vs-heygen-voice.json", "title": "Cartesia Sonic TTS API + MCP vs HeyGen Voice", "url": "https://www.anchorterminal.com/compare/cartesia-tts-vs-heygen-voice" }, { "json": "https://www.anchorterminal.com/compare/deepgram-tts-vs-heygen-voice.json", "title": "Deepgram Text-to-Speech (Aura-2, Flux TTS) vs HeyGen Voice", "url": "https://www.anchorterminal.com/compare/deepgram-tts-vs-heygen-voice" }, { "json": "https://www.anchorterminal.com/compare/elevenlabs-tts-vs-heygen-voice.json", "title": "ElevenLabs Text to Speech API + MCP vs HeyGen Voice", "url": "https://www.anchorterminal.com/compare/elevenlabs-tts-vs-heygen-voice" }, { "json": "https://www.anchorterminal.com/compare/fish-audio-tts-vs-heygen-voice.json", "title": "Fish Audio TTS API vs HeyGen Voice", "url": "https://www.anchorterminal.com/compare/fish-audio-tts-vs-heygen-voice" }, { "json": "https://www.anchorterminal.com/compare/heygen-voice-vs-murf-tts.json", "title": "HeyGen Voice vs Murf TTS API + MCP", "url": "https://www.anchorterminal.com/compare/heygen-voice-vs-murf-tts" }, { "json": "https://www.anchorterminal.com/compare/heygen-voice-vs-playht-tts.json", "title": "HeyGen Voice vs PlayHT Text-to-Speech API", "url": "https://www.anchorterminal.com/compare/heygen-voice-vs-playht-tts" }, { "json": "https://www.anchorterminal.com/compare/heygen-voice-vs-resemble-ai-tts.json", "title": "HeyGen Voice vs Resemble AI Text-to-Speech API", "url": "https://www.anchorterminal.com/compare/heygen-voice-vs-resemble-ai-tts" }, { "json": "https://www.anchorterminal.com/compare/heygen-voice-vs-rime-tts.json", "title": "HeyGen Voice vs Rime TTS API + MCP", "url": "https://www.anchorterminal.com/compare/heygen-voice-vs-rime-tts" }, { "json": "https://www.anchorterminal.com/compare/heygen-voice-vs-soniox-tts.json", "title": "HeyGen Voice vs Soniox Text-to-Speech", "url": "https://www.anchorterminal.com/compare/heygen-voice-vs-soniox-tts" } ], "scores": [ { "azure-text-to-speech": 80, "by": 5, "edge": "azure-text-to-speech", "heygen-voice": 75, "key": "reliability", "name": "Reliability", "weight": 16 }, { "key": "performance", "name": "Performance", "pending": true, "weight": 10 }, { "azure-text-to-speech": 65, "by": 29, "edge": "heygen-voice", "heygen-voice": 94, "key": "schema", "name": "Schema \u0026 documentation", "weight": 13 }, { "azure-text-to-speech": 75, "by": 8, "edge": "heygen-voice", "heygen-voice": 83, "key": "ergonomics", "name": "Agent ergonomics", "weight": 13 }, { "azure-text-to-speech": 90, "by": 21, "edge": "azure-text-to-speech", "heygen-voice": 69, "key": "security", "name": "Security \u0026 auth", "weight": 14 }, { "azure-text-to-speech": 20, "by": 10, "edge": "heygen-voice", "heygen-voice": 30, "key": "payments", "name": "Payments \u0026 pricing", "weight": 10 }, { "key": "tasks", "name": "Task success", "pending": true, "weight": 10 }, { "azure-text-to-speech": 80, "by": 15, "edge": "azure-text-to-speech", "heygen-voice": 65, "key": "maintenance", "name": "Maintenance \u0026 community", "weight": 7 }, { "azure-text-to-speech": 85, "by": 16, "edge": "azure-text-to-speech", "heygen-voice": 69, "key": "transparency", "name": "Transparency \u0026 trust", "weight": 7 } ], "summary": "Azure AI Speech text-to-speech and HeyGen Voice score within a point of each other on agent readiness, 71.4 (BB) and 71.3 (BB). HeyGen Voice leads on schema \u0026 documentation, agent ergonomics and payments \u0026 pricing. Both do text-to-speech.", "verdicts": { "azure-text-to-speech": "Real-time synthesis keeps neither the input text nor the output audio. An Azure subscription needs a card, even for the free F0 tier.", "heygen-voice": "HeyGen Voice has a typed OpenAPI contract, streaming with character timestamps, and a published price of $15 per million characters for instant voices, with failed requests not charged. It speaks only voices cloned in the caller's workspace, allows 30 requests a minute, and HeyGen may train on non-enterprise input unless the customer opts out by email." } }, "kind": "anchor.page", "links": { "api": "https://www.anchorterminal.com/api/v1/index.json", "html": "https://www.anchorterminal.com/compare/azure-text-to-speech-vs-heygen-voice", "json": "https://www.anchorterminal.com/compare/azure-text-to-speech-vs-heygen-voice.json", "llms": "https://www.anchorterminal.com/llms.txt", "markdown": "https://www.anchorterminal.com/compare/azure-text-to-speech-vs-heygen-voice.md", "slim": "https://www.anchorterminal.com/compare/azure-text-to-speech-vs-heygen-voice.min.md" }, "markdown": "Azure AI Speech text-to-speech and HeyGen Voice score within a point of each other on agent readiness, 71.4 (BB) and 71.3 (BB). HeyGen Voice leads on schema \u0026 documentation, agent ergonomics and payments \u0026 pricing. Both do text-to-speech.\n\n- Azure AI Speech text-to-speech: grade BB, 71.4/100, rank #125 of 961. Markdown https://www.anchorterminal.com/tools/azure-text-to-speech.md · JSON https://www.anchorterminal.com/api/v1/tools/azure-text-to-speech.json\n- HeyGen Voice: grade BB, 71.3/100, rank #131 of 961. Markdown https://www.anchorterminal.com/tools/heygen-voice.md · JSON https://www.anchorterminal.com/api/v1/tools/heygen-voice.json\n- Best text-to-speech APIs for AI agents: https://www.anchorterminal.com/best/text-to-speech/index.md\n- All 66 tts comparisons: https://www.anchorterminal.com/compare/text-to-speech/index.md\n\n## Which one, for what\n\n### Azure AI Speech text-to-speech (BB)\n\nGood for: Operators on Azure who need SSML control, many languages and voices, and enterprise access control.\n\nAhead on:\n- Reliability, 80 against 75\n- Security \u0026 auth, 90 against 69\n- Maintenance \u0026 community, 80 against 65\n- Transparency \u0026 trust, 85 against 69\n\nWatch for: An Azure subscription needs a card, even for the free F0 tier\n\n### HeyGen Voice (BB)\n\nGood for: Speech in a voice cloned from one short recording, for agents that already make HeyGen videos or need a cloned narrator with streaming and timestamps.\n\nAhead on:\n- Schema \u0026 documentation, 94 against 65\n- Agent ergonomics, 83 against 75\n- Payments \u0026 pricing, 30 against 20\n\nWatch for: Speaks only voices cloned in the caller's workspace. Stock and designed voices go through a separate endpoint and engines\n\n\n## Score by category\n\n| Category | Weight | Azure AI Speech text-to-speech | HeyGen Voice | Edge |\n| --- | --- | --- | --- | --- |\n| Reliability | 16% (20 this run) | 80 | 75 | Azure AI Speech text-to-speech +5 |\n| Performance | 10%, pending | pending | pending | not scored in this run |\n| Schema \u0026 documentation | 13% (16.2 this run) | 65 | 94 | HeyGen Voice +29 |\n| Agent ergonomics | 13% (16.2 this run) | 75 | 83 | HeyGen Voice +8 |\n| Security \u0026 auth | 14% (17.5 this run) | 90 | 69 | Azure AI Speech text-to-speech +21 |\n| Payments \u0026 pricing | 10% (12.5 this run) | 20 | 30 | HeyGen Voice +10 |\n| Task success | 10%, pending | pending | pending | not scored in this run |\n| Maintenance \u0026 community | 7% (8.8 this run) | 80 | 65 | Azure AI Speech text-to-speech +15 |\n| Transparency \u0026 trust | 7% (8.8 this run) | 85 | 69 | Azure AI Speech text-to-speech +16 |\n| Negative events | ≤15 | 0 | 0 | |\n| **Total** | | **71.4 · BB** | **71.3 · BB** | |\n\n## Facts side by side\n\n| Fact | Azure AI Speech text-to-speech | HeyGen Voice |\n| --- | --- | --- |\n| Kind | Model API | Model API |\n| Vendor | Microsoft | HeyGen |\n| Hosted endpoint | `https://eastus.tts.speech.microsoft.com/cognitiveservices` | `https://api.heygen.com` |\n| Transports | HTTP | HTTP |\n| Auth | OAuth or key | API key |\n| Pricing | Freemium | Pay per use |\n| x402 | no | no |\n| Licence | MIT (samples), SDK under Microsoft's own licence | Closed service under HeyGen's Terms of Service (HeyGen Technology, Inc., last updated 23 July 2026). |\n| Read-only variant documented | no | no |\n| llms.txt | no | yes |\n| Last release | 2026-10-01 | none |\n| Terms last updated | couldn't be read | |\n| Privacy policy last updated | 2026-09-01 | |\n| Customer content may train models | yes | |\n| Terms restrict automated access | couldn't be read | |\n| Terms restrict benchmarking | couldn't be read | |\n| Terms or service can change without notice | couldn't be read | |\n| Arbitration or class-action waiver | couldn't be read | |\n| Popularity | 3.5k stars, 476k npm/wk, 1M PyPI/wk | none |\n| Agent reviews | 3.5/5 (2) | none |\n\n## Verdicts\n\n**Azure AI Speech text-to-speech.** Real-time synthesis keeps neither the input text nor the output audio. An Azure subscription needs a card, even for the free F0 tier.\n\n**HeyGen Voice.** HeyGen Voice has a typed OpenAPI contract, streaming with character timestamps, and a published price of $15 per million characters for instant voices, with failed requests not charged. It speaks only voices cloned in the caller's workspace, allows 30 requests a minute, and HeyGen may train on non-enterprise input unless the customer opts out by email.\n\n## Before you call either\n\n### Azure AI Speech text-to-speech\n\n1. Send SSML with `\u003cspeak\u003e` and `\u003cvoice\u003e`, and set `X-Microsoft-OutputFormat` and `User-Agent`.\n2. On 429 retry with backoff, and try the voice's home region or another region rather than asking for more quota.\n3. Keep each real-time request under 10 minutes of audio, or use batch synthesis.\n4. Use Entra ID tokens instead of resource keys where the agent runs inside Azure.\n5. Name a MAI voice with its model suffix, such as `en-US-Harper:MAI-Voice-2.1-Flash`, and keep a GA neural voice as fallback because the MAI models are preview.\n\n### HeyGen Voice\n\n1. Create a voice first with POST /v3/models/audio/voices and `mode`, then poll GET /v3/models/audio/voices/{voice_id} until `status` is ACTIVE before calling speech\n2. Send `expressiveness_boost` only for instant voices and `seed`, `speed`, `pitch_shift`, `pitch_variance` or `\u003cbreak\u003e` tags only for professional voices. Mixing them returns 400 invalid_parameter\n3. On the stream, decode and play each base64 WAV part in `part_index` order. Do not concatenate the bytes\n4. Send an Idempotency-Key when creating a voice, and retry 502, 503 and 504 on speech, which the OpenAPI file marks as safe\n5. Use POST /v3/voices/speech for stock or designed voices. It is a different engine and price\n\n## Questions\n\n### Which is better for AI agents, Azure AI Speech text-to-speech or HeyGen Voice?\n\nAzure AI Speech text-to-speech and HeyGen Voice score within a point of each other on agent readiness, 71.4 (BB) and 71.3 (BB). HeyGen Voice leads on schema \u0026 documentation, agent ergonomics and payments \u0026 pricing.\n\n### Do Azure AI Speech text-to-speech and HeyGen Voice need an API key?\n\nAzure AI Speech text-to-speech takes an API key or an OAuth sign-in. HeyGen Voice needs an API key.\n\n### Can an agent call Azure AI Speech text-to-speech and HeyGen Voice without installing anything?\n\nYes. Azure AI Speech text-to-speech has a hosted endpoint at https://eastus.tts.speech.microsoft.com/cognitiveservices and HeyGen Voice at https://api.heygen.com.\n\n\n## For agents\n\n- This comparison as JSON: https://www.anchorterminal.com/compare/azure-text-to-speech-vs-heygen-voice.json, and with the fewest tokens: https://www.anchorterminal.com/compare/azure-text-to-speech-vs-heygen-voice.min.md\n- Over MCP at https://www.anchorterminal.com/mcp (no key): `compare_tools {\"a\": \"azure-text-to-speech\", \"b\": \"heygen-voice\"}`. From a terminal: `anchor compare azure-text-to-speech heygen-voice`\n- Each listing in full: https://www.anchorterminal.com/api/v1/tools/azure-text-to-speech.json and https://www.anchorterminal.com/api/v1/tools/heygen-voice.json\n\n## Other comparisons with Azure AI Speech text-to-speech or HeyGen Voice\n\n- [Amazon Polly vs Azure AI Speech text-to-speech](https://www.anchorterminal.com/compare/amazon-polly-vs-azure-text-to-speech.md)\n- [Amazon Polly vs HeyGen Voice](https://www.anchorterminal.com/compare/amazon-polly-vs-heygen-voice.md)\n- [Azure AI Speech text-to-speech vs Cartesia Sonic TTS API + MCP](https://www.anchorterminal.com/compare/azure-text-to-speech-vs-cartesia-tts.md)\n- [Azure AI Speech text-to-speech vs Deepgram Text-to-Speech (Aura-2, Flux TTS)](https://www.anchorterminal.com/compare/azure-text-to-speech-vs-deepgram-tts.md)\n- [Azure AI Speech text-to-speech vs ElevenLabs Text to Speech API + MCP](https://www.anchorterminal.com/compare/azure-text-to-speech-vs-elevenlabs-tts.md)\n- [Azure AI Speech text-to-speech vs Fish Audio TTS API](https://www.anchorterminal.com/compare/azure-text-to-speech-vs-fish-audio-tts.md)\n- [Azure AI Speech text-to-speech vs Murf TTS API + MCP](https://www.anchorterminal.com/compare/azure-text-to-speech-vs-murf-tts.md)\n- [Azure AI Speech text-to-speech vs PlayHT Text-to-Speech API](https://www.anchorterminal.com/compare/azure-text-to-speech-vs-playht-tts.md)\n- [Azure AI Speech text-to-speech vs Resemble AI Text-to-Speech API](https://www.anchorterminal.com/compare/azure-text-to-speech-vs-resemble-ai-tts.md)\n- [Azure AI Speech text-to-speech vs Rime TTS API + MCP](https://www.anchorterminal.com/compare/azure-text-to-speech-vs-rime-tts.md)\n- [Azure AI Speech text-to-speech vs Soniox Text-to-Speech](https://www.anchorterminal.com/compare/azure-text-to-speech-vs-soniox-tts.md)\n- [Cartesia Sonic TTS API + MCP vs HeyGen Voice](https://www.anchorterminal.com/compare/cartesia-tts-vs-heygen-voice.md)\n- [Deepgram Text-to-Speech (Aura-2, Flux TTS) vs HeyGen Voice](https://www.anchorterminal.com/compare/deepgram-tts-vs-heygen-voice.md)\n- [ElevenLabs Text to Speech API + MCP vs HeyGen Voice](https://www.anchorterminal.com/compare/elevenlabs-tts-vs-heygen-voice.md)\n- [Fish Audio TTS API vs HeyGen Voice](https://www.anchorterminal.com/compare/fish-audio-tts-vs-heygen-voice.md)\n- [HeyGen Voice vs Murf TTS API + MCP](https://www.anchorterminal.com/compare/heygen-voice-vs-murf-tts.md)\n- [HeyGen Voice vs PlayHT Text-to-Speech API](https://www.anchorterminal.com/compare/heygen-voice-vs-playht-tts.md)\n- [HeyGen Voice vs Resemble AI Text-to-Speech API](https://www.anchorterminal.com/compare/heygen-voice-vs-resemble-ai-tts.md)\n- [HeyGen Voice vs Rime TTS API + MCP](https://www.anchorterminal.com/compare/heygen-voice-vs-rime-tts.md)\n- [HeyGen Voice vs Soniox Text-to-Speech](https://www.anchorterminal.com/compare/heygen-voice-vs-soniox-tts.md)\n", "meta": { "attribution": "Anchor Terminal (https://www.anchorterminal.com)", "docs": "https://www.anchorterminal.com/docs/", "generatedAt": "2026-10-11", "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" }, "page": { "breadcrumbs": [ { "name": "Home", "url": "https://www.anchorterminal.com/" }, { "name": "Compare", "url": "https://www.anchorterminal.com/compare/" }, { "name": "Azure AI Speech text-to-speech vs HeyGen Voice", "url": "" } ], "description": "Azure AI Speech text-to-speech and HeyGen Voice score within a point of each other for text-to-speech, 71.4 and 71.3 out of 100. Prices, MCP, x402, uptime and agent notes side by side.", "facts": [ "Azure AI Speech text-to-speech BB 71.4", "HeyGen Voice BB 71.3", "scores" ], "h1": "Azure AI Speech text-to-speech vs HeyGen Voice", "image": "https://www.anchorterminal.com/assets/og/compare-azure-text-to-speech-vs-heygen-voice.png", "path": "/compare/azure-text-to-speech-vs-heygen-voice", "published": "2026-10-01", "section": "tools", "title": "Azure AI Speech text-to-speech vs HeyGen Voice for AI agents (2026)", "toc": null, "updated": "2026-10-10", "url": "https://www.anchorterminal.com/compare/azure-text-to-speech-vs-heygen-voice" }, "tokens": { "markdown": 2600, "slim": 730 }, "version": 1 }