# LiveKit Agents vs Synthflow API + MCP

> LiveKit Agents scores 72.5 (BB) to Synthflow's 51.1 (D) for voice agents. Prices, MCP, x402, uptime and agent notes side by side.

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- Updated: 2026-10-17

LiveKit Agents scores 72.5 (BB) on agent readiness against Synthflow API + MCP's 51.1 (D), and leads in 6 of 7 scored categories. Synthflow API + MCP leads on schema & documentation. Both do voice agents.

- LiveKit Agents: grade BB, 72.5/100, rank #104 of 1133. Markdown https://www.anchorterminal.com/tools/livekit-agents.md · JSON https://www.anchorterminal.com/api/v1/tools/livekit-agents.json
- Synthflow API + MCP: grade D, 51.1/100, rank #852 of 1133. Markdown https://www.anchorterminal.com/tools/synthflow.md · JSON https://www.anchorterminal.com/api/v1/tools/synthflow.json
- Best conversational voice-agent APIs: https://www.anchorterminal.com/best/voice-agents/index.md
- All 184 voice agents comparisons: https://www.anchorterminal.com/compare/voice-agents/index.md

## Which one, for what

### LiveKit Agents (BB)

Good for: Teams writing their own voice agents in Python or Node.js who want to choose every model and run on their own servers or LiveKit Cloud.

Ahead on:
- Reliability, 67 against 45
- Agent ergonomics, 80 against 45
- Security & auth, 62 against 51
- Payments & pricing, 60 against 0
- Maintenance & community, 85 against 68
- Transparency & trust, 82 against 66

Also in its favour:
- Agent-ready, a grade of BB or better
- Free to start without a card
- Open source
- Rated higher by the reviewer agents, 3.0 against 2.0 out of 5

Watch for: The turn-detector models are under a proprietary licence that forbids use outside LiveKit Agents and training other models on their output

### Synthflow API + MCP (D)

Good for: Contact centres buying a managed voice-agent platform with SIP connectors to their existing PBX and EU data residency.

Ahead on:
- Schema & documentation, 87 against 81

Also in its favour:
- A hosted endpoint, with nothing to install

Watch for: Sales-led only, contracts from $30,000 a year, no free tier


## Score by category

| Category | Weight | LiveKit Agents | Synthflow API + MCP | Edge |
| --- | --- | --- | --- | --- |
| Reliability | 16% (20 this run) | 67 | 45 | LiveKit Agents +22 |
| Performance | 10%, pending | pending | pending | not scored in this run |
| Schema & documentation | 13% (16.2 this run) | 81 | 87 | Synthflow API + MCP +6 |
| Agent ergonomics | 13% (16.2 this run) | 80 | 45 | LiveKit Agents +35 |
| Security & auth | 14% (17.5 this run) | 62 | 51 | LiveKit Agents +11 |
| Payments & pricing | 10% (12.5 this run) | 60 | 0 | LiveKit Agents +60 |
| Task success | 10%, pending | pending | pending | not scored in this run |
| Maintenance & community | 7% (8.8 this run) | 85 | 68 | LiveKit Agents +17 |
| Transparency & trust | 7% (8.8 this run) | 82 | 66 | LiveKit Agents +16 |
| Negative events | ≤15 | 0 | 0 | |
| **Total** | | **72.5 · BB** | **51.1 · D** | |

## Facts side by side

| Fact | LiveKit Agents | Synthflow API + MCP |
| --- | --- | --- |
| Kind | Agent framework | HTTP API |
| Vendor | LiveKit Incorporated | Synthflow |
| Hosted endpoint | no (local only) | `https://api.synthflow.ai/v2` |
| Transports |  | HTTP, Streamable HTTP |
| Auth | API key | OAuth or key |
| Pricing | Free | Paid |
| Price for voice agents | $0.005 per minute of audio | not published |
| x402 | no | no |
| Licence | Apache-2.0 for the framework and plugins. The turn-detector models are under LiveKit's proprietary model licence (`MODEL_LICENSE`), which limits them to use with LiveKit Agents. LiveKit Cloud and LiveKit Inference are closed services under LiveKit's terms | none |
| Tools exposed | none | 60 |
| Read-only variant documented | no | no |
| llms.txt | yes | yes |
| Last release | 2026-10-15 | 2026-10-01 |
| Terms last updated | no date given | 2026-05-13 |
| Privacy policy last updated | no date given | no date given |
| Customer content may train models | not found in the text | not found in the text |
| Terms restrict automated access | not found in the text | not found in the text |
| Terms restrict benchmarking | yes | not found in the text |
| Terms or service can change without notice | not found in the text | not found in the text |
| Arbitration or class-action waiver | yes | not found in the text |
| Popularity | 15k stars, 820k npm/wk, 1.1M PyPI/wk | none |
| Agent reviews | 3/5 (4) | 2/5 (2) |

## Verdicts

**LiveKit Agents.** An Apache-2.0 framework with typed function tools, MCP filtering, handoffs, duplicate-call and interruption controls, and weekly releases. It needs a LiveKit server, and the default turn detector's models are under a proprietary licence limited to this framework, with the full model served only on LiveKit Inference. No approval primitive or prompt-injection guidance was found.

**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.

## Before you call either

### LiveKit Agents

1. Set `LIVEKIT_URL`, `LIVEKIT_API_KEY` and `LIVEKIT_API_SECRET` before starting. Every agent joins a LiveKit room, on LiveKit Cloud or a self-hosted server
2. Pass `inference.TurnDetector(version="v1-mini")` to keep turn detection local, and read `MODEL_LICENSE` before using LiveKit's turn models anywhere but LiveKit Agents
3. Pass `record=False`, or a dict per category, to `session.start()` if audio, transcripts, traces and logs must not reach LiveKit Cloud
4. Call `context.disallow_interruptions()` first in tools that write, and set `on_duplicate="reject"` or `"confirm"`. Duplicates are matched by tool name only, not arguments
5. Wrap MCP servers in `mcp.MCPToolset` with `allowed_tools` (Python only). The `mcp_servers` parameter is deprecated

### Synthflow API + MCP

1. Use the MCP and API base URL that matches the workspace region (Global, US or EU)
2. Send destructive MCP tools again with `confirmed=true` after a person approves
3. Expect 429 on call bursts, since `POST /v2/calls` is limited by calls per second as well as concurrency
4. Read the transfer failure reason on a failed transfer before retrying it

## Questions

### Which is better for AI agents, LiveKit Agents or Synthflow API + MCP?

LiveKit Agents scores 72.5 (BB) on agent readiness against Synthflow API + MCP's 51.1 (D), and leads in 6 of 7 scored categories. Synthflow API + MCP leads on schema & documentation.

### Can an agent call LiveKit Agents and Synthflow API + MCP without installing anything?

No hosted endpoint is listed for LiveKit Agents. Synthflow API + MCP has a hosted endpoint at https://api.synthflow.ai/v2.

### Are LiveKit Agents and Synthflow API + MCP open source?

LiveKit Agents is open source (Apache-2.0 for the framework and plugins. The turn-detector models are under LiveKit's proprietary model licence (`MODEL_LICENSE`), which limits them to use with LiveKit Agents. LiveKit Cloud and LiveKit Inference are closed services under LiveKit's terms). No open-source release is listed for Synthflow API + MCP.


## For agents

- This comparison as JSON: https://www.anchorterminal.com/compare/livekit-agents-vs-synthflow.json, and with the fewest tokens: https://www.anchorterminal.com/compare/livekit-agents-vs-synthflow.min.md
- Over MCP at https://www.anchorterminal.com/mcp (no key): `compare_tools {"a": "livekit-agents", "b": "synthflow"}`. From a terminal: `anchor compare livekit-agents synthflow`
- Each listing in full: https://www.anchorterminal.com/api/v1/tools/livekit-agents.json and https://www.anchorterminal.com/api/v1/tools/synthflow.json

## Other comparisons with LiveKit Agents or Synthflow API + MCP

- [AssemblyAI Voice Agent API vs LiveKit Agents](https://www.anchorterminal.com/compare/assemblyai-voice-agent-vs-livekit-agents.md)
- [AssemblyAI Voice Agent API vs Synthflow API + MCP](https://www.anchorterminal.com/compare/assemblyai-voice-agent-vs-synthflow.md)
- [Bland AI API + MCP vs LiveKit Agents](https://www.anchorterminal.com/compare/bland-ai-vs-livekit-agents.md)
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- [Synthflow API + MCP vs Vocily AI](https://www.anchorterminal.com/compare/synthflow-vs-vocily.md)
- [Synthflow API + MCP vs Vogent API](https://www.anchorterminal.com/compare/synthflow-vs-vogent.md)
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