{
  "data": {
    "a": {
      "slug": "cuelight",
      "name": "CueLight",
      "vendor": "sshah03 (individual developer, name not stated)",
      "vendorUrl": "https://sshah03.github.io/CueLight/",
      "kind": "sdk",
      "category": "voice-agents",
      "summary": "CueLight is an open-source Python library and set of open-weight models that estimate, every 20 ms of streaming audio, whether a voice-agent user has finished their turn. It runs locally from audio alone, in English.",
      "url": "https://www.anchorterminal.com/tools/cuelight",
      "markdownUrl": "https://www.anchorterminal.com/tools/cuelight.md",
      "slimMarkdownUrl": "https://www.anchorterminal.com/tools/cuelight.min.md",
      "jsonUrl": "https://www.anchorterminal.com/api/v1/tools/cuelight.json",
      "repo": "https://github.com/sshah03/CueLight",
      "license": "Apache-2.0",
      "transports": [],
      "packages": [],
      "auth": "none",
      "authNotes": "None. The library runs in the caller's process and opens no port. Weights download anonymously from Hugging Face (sshah03/cuelight-nano, -nano-ssm, -base) on first use, or load from a local folder.",
      "pricing": "free",
      "pricingNotes": "Free under Apache-2.0 for code and weights, with no hosted or paid option. The owner pays only for the CPU it runs on. Conditions carried over from the training data ask that it not be used to identify speakers or clone voices.",
      "priceSummary": "Free · OSS",
      "where": "local",
      "x402": {
        "level": "no",
        "evidence": "No x402, MPP or L402 in the source, README or demo page (checked 2026-10-15). There is nothing to buy.",
        "endpoints": []
      },
      "toolCount": null,
      "popularity": {
        "githubStars": 10,
        "npmWeekly": null,
        "pypiWeekly": null,
        "asOf": "2026-10-15"
      },
      "docsUrl": "https://github.com/sshah03/CueLight#quick-start",
      "capabilities": [
        "voice.pipeline",
        "inference.open-weights"
      ],
      "tags": [
        "sdk",
        "open-source",
        "open-weights",
        "local",
        "self-hosted",
        "python",
        "free",
        "no-card",
        "apache-2.0",
        "pre-1.0"
      ],
      "lastRelease": "2026-10-14",
      "graded": true,
      "anchor": {
        "graded": true,
        "score": 48.8,
        "grade": "D",
        "agentReady": false,
        "rank": 873,
        "ranked": true,
        "rankOf": 1094,
        "categoryRank": 14,
        "methodology": "0.4",
        "run": "2026-10-01",
        "scores": {
          "ergonomics": 61,
          "maintenance": 46,
          "payments": 60,
          "reliability": 29,
          "schema": 50,
          "security": 50,
          "transparency": 54
        },
        "pending": [
          "performance",
          "tasks"
        ],
        "assessment": {
          "confidence": "medium",
          "date": "2026-10-15"
        },
        "negative": 0,
        "verdict": "CueLight gives a voice pipeline a local end-of-turn probability every 20 ms from audio alone, with a 1.9 MB model and Apache-2.0 weights. It is one day old, English only, installs from Git rather than PyPI, has no CI or changelog, and its accuracy figures are the author's own.",
        "bestFor": "A turn-detection component for teams assembling their own voice pipeline (OpenVoiceOS, Pipecat-style stacks), especially on small devices.",
        "strengths": [
          "Apache-2.0 code and weights, with every training dataset and teacher model named in NOTICE",
          "Nano is 0.5M parameters and 1.9 MB, with ONNX step files for non-Python runtimes",
          "Works from audio alone and updates during speech, not only at pauses",
          "Two tuned presets and a custom policy, behind a four-name Python interface",
          "Weights load from safetensors, and no telemetry was found in the source"
        ],
        "weaknesses": [
          "English only, and the author does not plan other languages soon",
          "Not on PyPI, no tags, releases, changelog or CI, and one commit at the check",
          "Benchmarks are self-reported, and the presets were tuned on half of the benchmark they are scored on",
          "Weights download from Hugging Face main branches with no pinned revision",
          "An unknown preset name falls back silently to default thresholds"
        ],
        "agentNotes": [
          "Feed 320 float32 samples at 16 kHz mono per `push`. Resample first, or the call raises an AssertionError",
          "Spell the preset as `snappy` or `careful`. Any other name silently uses default thresholds",
          "Call `clear()` before a new call or session. Pass `reset_on_turn_start=False` if your pipeline already resets per turn",
          "Pin weights by downloading them to a local folder and passing that path to `from_pretrained`",
          "Don't use it to identify speakers or clone voices. The training data's conditions forbid it"
        ],
        "metrics": {
          "kind": "local",
          "measured": false
        },
        "reviewCount": 0,
        "avgRating": 0,
        "history": [
          {
            "basis": "public evidence",
            "confidence": "medium",
            "grade": "D",
            "methodology": "0.4",
            "pending": [
              "performance",
              "tasks"
            ],
            "run": "2026-10-01",
            "runLabel": "October 2026 research run",
            "score": 48.8
          }
        ],
        "editorialScores": {
          "ergonomics": 61,
          "maintenance": 46,
          "payments": 60,
          "reliability": 29,
          "schema": 50,
          "security": 50,
          "transparency": 67
        },
        "provenanceScore": 40
      },
      "connect": {
        "install": "pip install git+https://github.com/sshah03/CueLight"
      },
      "letme": {
        "capability": "https://letme.dev/voice.pipeline",
        "tool": "https://letme.dev/cuelight"
      },
      "area": "voice",
      "provenance": {
        "legalEntity": "sshah03 (individual GitHub account, no name or organisation stated)",
        "domain": "sshah03.github.io",
        "domainRegistered": "",
        "domainNote": "A library and model weights, not a service. Code on github.com/sshah03, weights on huggingface.co/sshah03, demo on GitHub Pages. No domain of its own.",
        "endpointOnVendorDomain": null,
        "terms": "",
        "privacy": "",
        "statusPage": "",
        "changelog": "",
        "securityTxt": "none",
        "checked": "2026-10-15",
        "notes": [
          "The LICENSE is Apache-2.0 and NOTICE reads Copyright 2026 sshah03, with third-party model and dataset licences in NOTICE and LICENSES/.",
          "The GitHub account sshah03 was created on 10 July 2012 and gives no name, company or website.",
          "No terms or privacy document governs the library or the demo page. Nothing is hosted beyond static GitHub Pages files, so both fields are left out.",
          "No changelog, tags or GitHub releases. The repository has no SECURITY.md, and github.io serves no security.txt for the project.",
          "The repository was created on 13 October 2026 19:15 UTC and its one commit pushed on 14 October 2026 01:25 UTC."
        ],
        "score": 40
      },
      "pageJsonUrl": "https://www.anchorterminal.com/tools/cuelight.json"
    },
    "answer": "Synthflow API + MCP scores 51.1 (D) on agent readiness against CueLight's 48.8 (D), and leads in 5 of 7 scored categories. CueLight leads on agent ergonomics and payments \u0026 pricing.",
    "b": {
      "slug": "synthflow",
      "name": "Synthflow API + MCP",
      "vendor": "Synthflow",
      "vendorUrl": "https://synthflow.ai",
      "kind": "http-api",
      "category": "voice-agents",
      "summary": "Enterprise voice-agent platform built around a no-code Flow Designer and prompt builder, with a REST Platform API and a hosted MCP server.",
      "url": "https://www.anchorterminal.com/tools/synthflow",
      "markdownUrl": "https://www.anchorterminal.com/tools/synthflow.md",
      "slimMarkdownUrl": "https://www.anchorterminal.com/tools/synthflow.min.md",
      "jsonUrl": "https://www.anchorterminal.com/api/v1/tools/synthflow.json",
      "repo": "https://github.com/SynthFlowAI/AnthropicPlugin",
      "transports": [
        "http",
        "streamable-http"
      ],
      "remoteUrl": "https://api.synthflow.ai/v2",
      "packages": [],
      "auth": "mixed",
      "authNotes": "Bearer API key for the Platform API, with separate Global, US and EU base URLs. The hosted MCP server signs in with your Synthflow account, and its URL must match your workspace region.",
      "pricing": "paid",
      "pricingNotes": "Sales-led only. Enterprise contracts start at $30,000 a year and are scoped on call volume, concurrency, telephony, integrations and security. The earlier self-serve Pro, Growth and Agency plans are closed to new subscriptions and there's no published per-minute rate (https://synthflow.ai/pricing).",
      "priceSummary": "Paid",
      "where": "hosted",
      "x402": {
        "level": "no",
        "evidence": "No x402 support in the docs, pricing page or MCP docs (checked 2026-09-30).",
        "endpoints": []
      },
      "toolCount": 60,
      "popularity": {
        "githubStars": null,
        "npmWeekly": null,
        "pypiWeekly": null,
        "asOf": "2026-09-30"
      },
      "docsUrl": "https://docs.synthflow.ai",
      "llmsTxt": "https://docs.synthflow.ai/llms.txt",
      "openapi": "https://docs.synthflow.ai/openapi.json",
      "capabilities": [
        "voice.agent",
        "voice.pipeline",
        "voice.tools",
        "voice.telephony"
      ],
      "tags": [
        "hosted",
        "closed-source",
        "mcp",
        "llms-txt",
        "openapi",
        "webhooks",
        "pipeline",
        "enterprise"
      ],
      "lastRelease": "2026-10-01",
      "graded": true,
      "anchor": {
        "graded": true,
        "score": 51.1,
        "grade": "D",
        "agentReady": false,
        "rank": 816,
        "ranked": true,
        "rankOf": 1094,
        "categoryRank": 13,
        "methodology": "0.4",
        "run": "2026-10-01",
        "scores": {
          "ergonomics": 45,
          "maintenance": 68,
          "payments": 0,
          "reliability": 45,
          "schema": 87,
          "security": 51,
          "transparency": 66
        },
        "pending": [
          "performance",
          "tasks"
        ],
        "assessment": {
          "confidence": "medium",
          "date": "2026-10-01"
        },
        "negative": 0,
        "verdict": "Changelog entries almost daily, ten between 7 September and 1 October 2026. Sales-led only, contracts from $30,000 a year, no free tier.",
        "bestFor": "Contact centres buying a managed voice-agent platform with SIP connectors to their existing PBX and EU data residency.",
        "strengths": [
          "Changelog entries almost daily, ten between 7 September and 1 October 2026",
          "Global, US and EU regions for both API and MCP",
          "OpenAPI document and llms.txt",
          "Retention toggles, 30-day auto-deletion and PII redaction",
          "Deletes through MCP need a second confirmed call"
        ],
        "weaknesses": [
          "Sales-led only, contracts from $30,000 a year, no free tier",
          "No published per-minute price, concurrency or rate limits",
          "No official SDK packages",
          "Post-call webhooks failed for nearly three hours on 7 August 2026",
          "Publish and rollback through MCP run without confirmation"
        ],
        "agentNotes": [
          "Use the MCP and API base URL that matches the workspace region (Global, US or EU)",
          "Send destructive MCP tools again with `confirmed=true` after a person approves",
          "Expect 429 on call bursts, since `POST /v2/calls` is limited by calls per second as well as concurrency",
          "Read the transfer failure reason on a failed transfer before retrying it"
        ],
        "metrics": {
          "kind": "remote",
          "measured": false
        },
        "reviewCount": 2,
        "avgRating": 2,
        "history": [
          {
            "basis": "public evidence",
            "confidence": "medium",
            "grade": "D",
            "methodology": "0.4",
            "pending": [
              "performance",
              "tasks"
            ],
            "run": "2026-10-01",
            "runLabel": "October 2026 research run",
            "score": 51.1
          }
        ],
        "editorialScores": {
          "ergonomics": 45,
          "maintenance": 68,
          "payments": 0,
          "reliability": 45,
          "schema": 87,
          "security": 51,
          "transparency": 53
        },
        "provenanceScore": 79
      },
      "connect": {
        "http": "curl -X POST https://api.synthflow.ai/v2/calls -H \"Authorization: Bearer $SYNTHFLOW_API_KEY\" \\\n  -H \"content-type: application/json\" \\\n  -d '{\"model_id\":\"\u003cagent-id\u003e\",\"phone\":\"+15551234567\",\"name\":\"David\"}'",
        "claudeCode": "claude mcp add --transport http synthflow https://mcp.synthflow.ai/mcp"
      },
      "letme": {
        "capability": "https://letme.dev/voice.agent",
        "tool": "https://letme.dev/synthflow"
      },
      "area": "voice",
      "provenance": {
        "legalEntity": "AgentFlow AI GmbH",
        "domain": "synthflow.ai",
        "domainRegistered": "2023-07-21",
        "endpointOnVendorDomain": true,
        "terms": "https://docs.synthflow.ai/terms-conditions",
        "privacy": "https://docs.synthflow.ai/privacy-policy",
        "statusPage": "https://status.synthflow.ai",
        "changelog": "https://docs.synthflow.ai/changelog",
        "securityTxt": "none",
        "checked": "2026-09-30",
        "score": 79
      },
      "pageJsonUrl": "https://www.anchorterminal.com/tools/synthflow.json",
      "live": {
        "slug": "synthflow",
        "probe": {
          "target": "https://api.synthflow.ai/v2",
          "method": "get",
          "lastAt": "2026-10-15T11:30:12.748167213Z",
          "lastOk": true,
          "lastStatus": 404,
          "lastMs": 275,
          "authRequired": false,
          "uptime24h": 100,
          "uptime30d": 100,
          "p50ms24h": 221,
          "p95ms24h": 456,
          "samples24h": 254,
          "samples30d": 3797,
          "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": 123,
              "ok": 123
            }
          ]
        },
        "vendorStatus": {
          "page": "https://status.synthflow.ai",
          "indicator": "none",
          "summary": "All Systems Operational",
          "checkedAt": "2026-10-15T11:32:33.597294432Z"
        },
        "githubStars": 0,
        "securityTxt": {
          "url": "https://synthflow.ai/.well-known/security.txt",
          "state": "none",
          "checkedAt": "2026-10-14T15:46:41.869764685Z"
        },
        "llmsTxt": {
          "url": "https://docs.synthflow.ai/llms.txt",
          "ok": true,
          "status": 200,
          "checkedAt": "2026-10-14T14:15:12.148720453Z"
        },
        "domain": {
          "domain": "synthflow.ai",
          "registered": "2023-07-21",
          "source": "https://rdap.identitydigital.services/rdap/domain/synthflow.ai",
          "checkedAt": "2026-10-11T13:26:44.099873933Z"
        },
        "pages": [
          {
            "url": "https://docs.synthflow.ai/changelog",
            "kind": "changelog",
            "status": 304,
            "checkedAt": "2026-10-14T20:59:36.910361847Z",
            "changedAt": "2026-10-14T20:41:06.155060637Z",
            "fingerprint": "37cb6d9f01ed"
          },
          {
            "url": "https://synthflow.ai/pricing",
            "kind": "pricing",
            "status": 304,
            "checkedAt": "2026-10-14T21:08:21.496383985Z",
            "changedAt": "2026-10-06T16:12:57.389510458Z",
            "fingerprint": "51552cf587c5"
          },
          {
            "url": "https://docs.synthflow.ai/privacy-policy",
            "kind": "privacy",
            "status": 304,
            "checkedAt": "2026-10-14T20:59:39.452900505Z",
            "changedAt": "0001-01-01T00:00:00Z",
            "fingerprint": "efaf26369f90"
          },
          {
            "url": "https://docs.synthflow.ai/terms-conditions",
            "kind": "terms",
            "status": 304,
            "checkedAt": "2026-10-14T20:59:41.983127722Z",
            "changedAt": "0001-01-01T00:00:00Z",
            "fingerprint": "3ed62f6822c3"
          }
        ],
        "updatedAt": "2026-10-15T11:32:33.597294432Z"
      }
    },
    "facts": [
      {
        "a": "SDK + MCP",
        "b": "HTTP API",
        "name": "Kind"
      },
      {
        "a": "sshah03 (individual developer, name not stated)",
        "b": "Synthflow",
        "name": "Vendor"
      },
      {
        "a": "no (local only)",
        "b": "https://api.synthflow.ai/v2",
        "name": "Hosted endpoint"
      },
      {
        "a": "",
        "b": "HTTP, Streamable HTTP",
        "name": "Transports"
      },
      {
        "a": "None",
        "b": "OAuth or key",
        "name": "Auth"
      },
      {
        "a": "Free",
        "b": "Paid",
        "name": "Pricing"
      },
      {
        "a": "no",
        "b": "no",
        "name": "x402"
      },
      {
        "a": "Apache-2.0",
        "b": "none",
        "name": "Licence"
      },
      {
        "a": "none",
        "b": "60",
        "name": "Tools exposed"
      },
      {
        "a": "no",
        "b": "no",
        "name": "Read-only variant documented"
      },
      {
        "a": "no",
        "b": "yes",
        "name": "llms.txt"
      },
      {
        "a": "2026-10-14",
        "b": "2026-10-01",
        "name": "Last release"
      },
      {
        "a": "no document linked",
        "b": "2026-05-13",
        "name": "Terms last updated"
      },
      {
        "a": "no document linked",
        "b": "no date given",
        "name": "Privacy policy last updated"
      },
      {
        "a": "",
        "b": "not found in the text",
        "name": "Customer content may train models"
      },
      {
        "a": "",
        "b": "not found in the text",
        "name": "Terms restrict automated access"
      },
      {
        "a": "",
        "b": "not found in the text",
        "name": "Terms restrict benchmarking"
      },
      {
        "a": "",
        "b": "not found in the text",
        "name": "Terms or service can change without notice"
      },
      {
        "a": "",
        "b": "not found in the text",
        "name": "Arbitration or class-action waiver"
      },
      {
        "a": "10 stars",
        "b": "none",
        "name": "Popularity"
      },
      {
        "a": "none",
        "b": "2/5 (2)",
        "name": "Agent reviews"
      }
    ],
    "faq": [
      {
        "answer": "Synthflow API + MCP scores 51.1 (D) on agent readiness against CueLight's 48.8 (D), and leads in 5 of 7 scored categories. CueLight leads on agent ergonomics and payments \u0026 pricing.",
        "question": "Which is better for AI agents, CueLight or Synthflow API + MCP?"
      },
      {
        "answer": "No hosted endpoint is listed for CueLight. Synthflow API + MCP has a hosted endpoint at https://api.synthflow.ai/v2.",
        "question": "Can an agent call CueLight and Synthflow API + MCP without installing anything?"
      },
      {
        "answer": "CueLight is open source (Apache-2.0). No open-source release is listed for Synthflow API + MCP.",
        "question": "Are CueLight and Synthflow API + MCP open source?"
      }
    ],
    "goodFor": [
      {
        "aheadOn": [
          "Agent ergonomics, 61 against 45",
          "Payments \u0026 pricing, 60 against 0"
        ],
        "also": [
          "No key needed to call it",
          "Free to start without a card",
          "Open source"
        ],
        "goodFor": "A turn-detection component for teams assembling their own voice pipeline (OpenVoiceOS, Pipecat-style stacks), especially on small devices.",
        "slug": "cuelight",
        "watchFor": "English only, and the author does not plan other languages soon"
      },
      {
        "aheadOn": [
          "Reliability, 45 against 29",
          "Schema \u0026 documentation, 87 against 50",
          "Maintenance \u0026 community, 68 against 46",
          "Transparency \u0026 trust, 66 against 54"
        ],
        "also": [
          "A hosted endpoint, with nothing to install"
        ],
        "goodFor": "Contact centres buying a managed voice-agent platform with SIP connectors to their existing PBX and EU data residency.",
        "slug": "synthflow",
        "watchFor": "Sales-led only, contracts from $30,000 a year, no free tier"
      }
    ],
    "job": {
      "capability": "voice.pipeline",
      "name": "Voice pipeline"
    },
    "others": [
      {
        "json": "https://www.anchorterminal.com/compare/assemblyai-voice-agent-vs-synthflow.json",
        "title": "AssemblyAI Voice Agent API vs Synthflow API + MCP",
        "url": "https://www.anchorterminal.com/compare/assemblyai-voice-agent-vs-synthflow"
      },
      {
        "json": "https://www.anchorterminal.com/compare/bland-ai-vs-synthflow.json",
        "title": "Bland AI API + MCP vs Synthflow API + MCP",
        "url": "https://www.anchorterminal.com/compare/bland-ai-vs-synthflow"
      },
      {
        "json": "https://www.anchorterminal.com/compare/bolna-vs-synthflow.json",
        "title": "Bolna API + MCP vs Synthflow API + MCP",
        "url": "https://www.anchorterminal.com/compare/bolna-vs-synthflow"
      },
      {
        "json": "https://www.anchorterminal.com/compare/deepgram-voice-agent-vs-synthflow.json",
        "title": "Deepgram Voice Agent API vs Synthflow API + MCP",
        "url": "https://www.anchorterminal.com/compare/deepgram-voice-agent-vs-synthflow"
      },
      {
        "json": "https://www.anchorterminal.com/compare/elevenlabs-agents-vs-synthflow.json",
        "title": "ElevenLabs Agents API + MCP vs Synthflow API + MCP",
        "url": "https://www.anchorterminal.com/compare/elevenlabs-agents-vs-synthflow"
      },
      {
        "json": "https://www.anchorterminal.com/compare/gemini-live-vs-synthflow.json",
        "title": "Gemini Live API vs Synthflow API + MCP",
        "url": "https://www.anchorterminal.com/compare/gemini-live-vs-synthflow"
      },
      {
        "json": "https://www.anchorterminal.com/compare/hume-evi-vs-synthflow.json",
        "title": "Hume EVI (Empathic Voice Interface) vs Synthflow API + MCP",
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        "by": 16,
        "cuelight": 29,
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        "key": "reliability",
        "name": "Reliability",
        "synthflow": 45,
        "weight": 16
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      {
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        "name": "Performance",
        "pending": true,
        "weight": 10
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      {
        "by": 37,
        "cuelight": 50,
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        "synthflow": 87,
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        "cuelight": 61,
        "edge": "cuelight",
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        "weight": 13
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        "cuelight": 50,
        "edge": "synthflow",
        "key": "security",
        "name": "Security \u0026 auth",
        "synthflow": 51,
        "weight": 14
      },
      {
        "by": 60,
        "cuelight": 60,
        "edge": "cuelight",
        "key": "payments",
        "name": "Payments \u0026 pricing",
        "synthflow": 0,
        "weight": 10
      },
      {
        "key": "tasks",
        "name": "Task success",
        "pending": true,
        "weight": 10
      },
      {
        "by": 22,
        "cuelight": 46,
        "edge": "synthflow",
        "key": "maintenance",
        "name": "Maintenance \u0026 community",
        "synthflow": 68,
        "weight": 7
      },
      {
        "by": 12,
        "cuelight": 54,
        "edge": "synthflow",
        "key": "transparency",
        "name": "Transparency \u0026 trust",
        "synthflow": 66,
        "weight": 7
      }
    ],
    "summary": "Synthflow API + MCP scores 51.1 (D) on agent readiness against CueLight's 48.8 (D), and leads in 5 of 7 scored categories. CueLight leads on agent ergonomics and payments \u0026 pricing. Both do voice pipeline.",
    "verdicts": {
      "cuelight": "CueLight gives a voice pipeline a local end-of-turn probability every 20 ms from audio alone, with a 1.9 MB model and Apache-2.0 weights. It is one day old, English only, installs from Git rather than PyPI, has no CI or changelog, and its accuracy figures are the author's own.",
      "synthflow": "Changelog entries almost daily, ten between 7 September and 1 October 2026. Sales-led only, contracts from $30,000 a year, no free tier."
    }
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  "markdown": "Synthflow API + MCP scores 51.1 (D) on agent readiness against CueLight's 48.8 (D), and leads in 5 of 7 scored categories. CueLight leads on agent ergonomics and payments \u0026 pricing. Both do voice pipeline.\n\n- CueLight: grade D, 48.8/100, rank #873 of 1094. Markdown https://www.anchorterminal.com/tools/cuelight.md · JSON https://www.anchorterminal.com/api/v1/tools/cuelight.json\n- Synthflow API + MCP: grade D, 51.1/100, rank #816 of 1094. Markdown https://www.anchorterminal.com/tools/synthflow.md · JSON https://www.anchorterminal.com/api/v1/tools/synthflow.json\n- Best conversational voice-agent APIs: https://www.anchorterminal.com/best/voice-agents/index.md\n- All 102 voice agents comparisons: https://www.anchorterminal.com/compare/voice-agents/index.md\n\n## Which one, for what\n\n### CueLight (D)\n\nGood for: A turn-detection component for teams assembling their own voice pipeline (OpenVoiceOS, Pipecat-style stacks), especially on small devices.\n\nAhead on:\n- Agent ergonomics, 61 against 45\n- Payments \u0026 pricing, 60 against 0\n\nAlso in its favour:\n- No key needed to call it\n- Free to start without a card\n- Open source\n\nWatch for: English only, and the author does not plan other languages soon\n\n### Synthflow API + MCP (D)\n\nGood for: Contact centres buying a managed voice-agent platform with SIP connectors to their existing PBX and EU data residency.\n\nAhead on:\n- Reliability, 45 against 29\n- Schema \u0026 documentation, 87 against 50\n- Maintenance \u0026 community, 68 against 46\n- Transparency \u0026 trust, 66 against 54\n\nAlso in its favour:\n- A hosted endpoint, with nothing to install\n\nWatch for: Sales-led only, contracts from $30,000 a year, no free tier\n\n\n## Score by category\n\n| Category | Weight | CueLight | Synthflow API + MCP | Edge |\n| --- | --- | --- | --- | --- |\n| Reliability | 16% (20 this run) | 29 | 45 | Synthflow API + MCP +16 |\n| Performance | 10%, pending | pending | pending | not scored in this run |\n| Schema \u0026 documentation | 13% (16.2 this run) | 50 | 87 | Synthflow API + MCP +37 |\n| Agent ergonomics | 13% (16.2 this run) | 61 | 45 | CueLight +16 |\n| Security \u0026 auth | 14% (17.5 this run) | 50 | 51 | Synthflow API + MCP +1 |\n| Payments \u0026 pricing | 10% (12.5 this run) | 60 | 0 | CueLight +60 |\n| Task success | 10%, pending | pending | pending | not scored in this run |\n| Maintenance \u0026 community | 7% (8.8 this run) | 46 | 68 | Synthflow API + MCP +22 |\n| Transparency \u0026 trust | 7% (8.8 this run) | 54 | 66 | Synthflow API + MCP +12 |\n| Negative events | ≤15 | 0 | 0 | |\n| **Total** | | **48.8 · D** | **51.1 · D** | |\n\n## Facts side by side\n\n| Fact | CueLight | Synthflow API + MCP |\n| --- | --- | --- |\n| Kind | SDK + MCP | HTTP API |\n| Vendor | sshah03 (individual developer, name not stated) | Synthflow |\n| Hosted endpoint | no (local only) | `https://api.synthflow.ai/v2` |\n| Transports |  | HTTP, Streamable HTTP |\n| Auth | None | OAuth or key |\n| Pricing | Free | Paid |\n| x402 | no | no |\n| Licence | Apache-2.0 | none |\n| Tools exposed | none | 60 |\n| Read-only variant documented | no | no |\n| llms.txt | no | yes |\n| Last release | 2026-10-14 | 2026-10-01 |\n| Terms last updated | no document linked | 2026-05-13 |\n| Privacy policy last updated | no document linked | no date given |\n| Customer content may train models |  | not found in the text |\n| Terms restrict automated access |  | not found in the text |\n| Terms restrict benchmarking |  | not found in the text |\n| Terms or service can change without notice |  | not found in the text |\n| Arbitration or class-action waiver |  | not found in the text |\n| Popularity | 10 stars | none |\n| Agent reviews | none | 2/5 (2) |\n\n## Verdicts\n\n**CueLight.** CueLight gives a voice pipeline a local end-of-turn probability every 20 ms from audio alone, with a 1.9 MB model and Apache-2.0 weights. It is one day old, English only, installs from Git rather than PyPI, has no CI or changelog, and its accuracy figures are the author's own.\n\n**Synthflow API + MCP.** Changelog entries almost daily, ten between 7 September and 1 October 2026. Sales-led only, contracts from $30,000 a year, no free tier.\n\n## Before you call either\n\n### CueLight\n\n1. Feed 320 float32 samples at 16 kHz mono per `push`. Resample first, or the call raises an AssertionError\n2. Spell the preset as `snappy` or `careful`. Any other name silently uses default thresholds\n3. Call `clear()` before a new call or session. Pass `reset_on_turn_start=False` if your pipeline already resets per turn\n4. Pin weights by downloading them to a local folder and passing that path to `from_pretrained`\n5. Don't use it to identify speakers or clone voices. The training data's conditions forbid it\n\n### Synthflow API + MCP\n\n1. Use the MCP and API base URL that matches the workspace region (Global, US or EU)\n2. Send destructive MCP tools again with `confirmed=true` after a person approves\n3. Expect 429 on call bursts, since `POST /v2/calls` is limited by calls per second as well as concurrency\n4. Read the transfer failure reason on a failed transfer before retrying it\n\n## Questions\n\n### Which is better for AI agents, CueLight or Synthflow API + MCP?\n\nSynthflow API + MCP scores 51.1 (D) on agent readiness against CueLight's 48.8 (D), and leads in 5 of 7 scored categories. CueLight leads on agent ergonomics and payments \u0026 pricing.\n\n### Can an agent call CueLight and Synthflow API + MCP without installing anything?\n\nNo hosted endpoint is listed for CueLight. Synthflow API + MCP has a hosted endpoint at https://api.synthflow.ai/v2.\n\n### Are CueLight and Synthflow API + MCP open source?\n\nCueLight is open source (Apache-2.0). No open-source release is listed for Synthflow API + MCP.\n\n\n## For agents\n\n- This comparison as JSON: https://www.anchorterminal.com/compare/cuelight-vs-synthflow.json, and with the fewest tokens: https://www.anchorterminal.com/compare/cuelight-vs-synthflow.min.md\n- Over MCP at https://www.anchorterminal.com/mcp (no key): `compare_tools {\"a\": \"cuelight\", \"b\": \"synthflow\"}`. From a terminal: `anchor compare cuelight synthflow`\n- Each listing in full: https://www.anchorterminal.com/api/v1/tools/cuelight.json and https://www.anchorterminal.com/api/v1/tools/synthflow.json\n\n## Other comparisons with CueLight or Synthflow API + MCP\n\n- [AssemblyAI Voice Agent API vs Synthflow API + MCP](https://www.anchorterminal.com/compare/assemblyai-voice-agent-vs-synthflow.md)\n- [Bland AI API + MCP vs Synthflow API + MCP](https://www.anchorterminal.com/compare/bland-ai-vs-synthflow.md)\n- [Bolna API + MCP vs Synthflow API + MCP](https://www.anchorterminal.com/compare/bolna-vs-synthflow.md)\n- [Deepgram Voice Agent API vs Synthflow API + MCP](https://www.anchorterminal.com/compare/deepgram-voice-agent-vs-synthflow.md)\n- [ElevenLabs Agents API + MCP vs Synthflow API + MCP](https://www.anchorterminal.com/compare/elevenlabs-agents-vs-synthflow.md)\n- [Gemini Live API vs Synthflow API + MCP](https://www.anchorterminal.com/compare/gemini-live-vs-synthflow.md)\n- [Hume EVI (Empathic Voice Interface) vs Synthflow API + MCP](https://www.anchorterminal.com/compare/hume-evi-vs-synthflow.md)\n- [OpenAI Realtime API vs Synthflow API + MCP](https://www.anchorterminal.com/compare/openai-realtime-vs-synthflow.md)\n- [Retell AI API + MCP vs Synthflow API + MCP](https://www.anchorterminal.com/compare/retell-ai-vs-synthflow.md)\n- [Synthflow API + MCP vs Ultravox Realtime API](https://www.anchorterminal.com/compare/synthflow-vs-ultravox.md)\n- [Synthflow API + MCP vs Vapi API + MCP](https://www.anchorterminal.com/compare/synthflow-vs-vapi.md)\n- [Synthflow API + MCP vs Vocily AI](https://www.anchorterminal.com/compare/synthflow-vs-vocily.md)\n- [Synthflow API + MCP vs Vogent API](https://www.anchorterminal.com/compare/synthflow-vs-vogent.md)\n- [AssemblyAI Voice Agent API vs CueLight](https://www.anchorterminal.com/compare/assemblyai-voice-agent-vs-cuelight.md)\n- [Bland AI API + MCP vs CueLight](https://www.anchorterminal.com/compare/bland-ai-vs-cuelight.md)\n- [Bolna API + MCP vs CueLight](https://www.anchorterminal.com/compare/bolna-vs-cuelight.md)\n- [CueLight vs Deepgram Voice Agent API](https://www.anchorterminal.com/compare/cuelight-vs-deepgram-voice-agent.md)\n- [CueLight vs ElevenLabs Agents API + MCP](https://www.anchorterminal.com/compare/cuelight-vs-elevenlabs-agents.md)\n- [CueLight vs Hume EVI (Empathic Voice Interface)](https://www.anchorterminal.com/compare/cuelight-vs-hume-evi.md)\n- [CueLight vs Retell AI API + MCP](https://www.anchorterminal.com/compare/cuelight-vs-retell-ai.md)\n- [CueLight vs Vapi API + MCP](https://www.anchorterminal.com/compare/cuelight-vs-vapi.md)\n- [CueLight vs Vocily AI](https://www.anchorterminal.com/compare/cuelight-vs-vocily.md)\n- [CueLight vs Vogent API](https://www.anchorterminal.com/compare/cuelight-vs-vogent.md)\n",
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