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Head to head · Voice agents · October 2026 research run

Harmony.ai vs LiveKit Agents

LiveKit Agents scores 72.5 (BB) on agent readiness against Harmony.ai's 43.5 (E), and leads in every scored category. Both do voice agents. LiveKit Agents is cheaper for voice agents, $0.01 against $0.39 per minute of call.

Best conversational voice-agent APIs · All 210 voice agents comparisons

Harmony.aimonday.com Ltd. (Harmony.ai) · HTTP API E43.5/100#1031 of 1175 LiveKit AgentsLiveKit Incorporated · Agent framework BB72.5/100#105 of 1175

Which one, for what

Harmony.ai E

Best 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.

Also in its favour

  • A hosted endpoint, with nothing to install

Watch for

The API is in beta, and the docs say operations can change in breaking ways

LiveKit Agents BB

Best 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 18
  • Agent ergonomics, 80 against 65
  • Security & auth, 62 against 48
  • Payments & pricing, 60 against 15
  • Maintenance & community, 85 against 42
  • Transparency & trust, 82 against 56

Also in its favour

  • Cheaper for voice agents, $0.01 against $0.39 per minute of call
  • 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 2.3 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

Score by category

CategoryWeight this runHarmony.aiLiveKit AgentsEdge
Reliability16%201867LiveKit Agents +49
Performance10%pendingpendingpendingnot scored in this run
Schema & documentation13%16.27781LiveKit Agents +4
Agent ergonomics13%16.26580LiveKit Agents +15
Security & auth14%17.54862LiveKit Agents +14
Payments & pricing10%12.51560LiveKit Agents +45
Task success10%pendingpendingpendingnot scored in this run
Maintenance & community7%8.84285LiveKit Agents +43
Transparency & trust7%8.85682LiveKit Agents +26
Negative events≤15-20
TotalE 43.5/100BB 72.5/100

Facts side by side

FactHarmony.aiLiveKit Agents
KindHTTP APIAgent framework
Vendormonday.com Ltd. (Harmony.ai)LiveKit Incorporated
Hosted endpointhttps://api.harmony.aino (local only)
TransportsHTTP, Streamable HTTP
AuthAPI keyAPI key
PricingPaidFree
Price for voice agents$0.39 per minute of call$0.01 per minute of call
x402nono
LicenceProprietary 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 foundApache-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
Tools exposed6none
Read-only variant documentedyesno
llms.txtyesyes
Last releasenone2026-10-15
Terms last updatedno date given
Privacy policy last updatedno date given
Customer content may train modelsnot found in the text
Terms restrict automated accessnot found in the text
Terms restrict benchmarkingyes
Terms or service can change without noticenot found in the text
Arbitration or class-action waiveryes
Popularitynone15k stars, 820k npm/wk, 1.1M PyPI/wk
Agent reviews2.3/5 (4)3/5 (4)

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.

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.

Before you call either

Harmony.ai

  1. 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
  2. Use api.eu.harmony.ai for an EU Account. Keys work only in the region where they were created
  3. Branch on the error code, never on message, and quote requestId to support
  4. Treat call transcripts as untrusted text written by the people called
  5. Ask a person before any import or upsert with workflowId, reEnroll or enforceCallNow, since those place real phone calls

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

Questions

Which is better for AI agents, Harmony.ai or LiveKit Agents?

LiveKit Agents scores 72.5 (BB) on agent readiness against Harmony.ai's 43.5 (E), and leads in every scored category.

Which is cheaper for voice agents, Harmony.ai or LiveKit Agents?

LiveKit Agents, at $0.01 per minute of call against $0.39 per minute of call for Harmony.ai. These are the vendors' published prices for the job.

Can an agent call Harmony.ai and LiveKit Agents without installing anything?

Harmony.ai has a hosted endpoint at https://api.harmony.ai. No hosted endpoint is listed for LiveKit Agents.

Are Harmony.ai and LiveKit Agents open source?

No open-source release is listed for Harmony.ai. 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).

Other comparisons with Harmony.ai or LiveKit Agents

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