Compare · Voice & speech

Conversational voice agents compared head to head

91 like-for-like comparisons of conversational voice-agent APIs, each pair scored category by category with prices, facts and verdicts side by side. Pairs are made only when both do the same job.

  • 91 comparisons
  • 1 job
  • 14 ranked

Ranked

  1. #1ElevenLabs Agents API + MCPBB71.3
  2. #2Retell AI API + MCPB69.1
  3. #3Deepgram Voice Agent APIB68.1
  4. #4AssemblyAI Voice Agent APIB64.4
  5. #5Bland AI API + MCPB63.8
  6. #6Vapi API + MCPB63.5
  7. #7OpenAI Realtime APIB63.3
  8. #8Ultravox Realtime APIC58.5
  9. #9Gemini Live APIC57.1
  10. #10Hume EVI (Empathic Voice Interface)C56.7
  11. #11Vocily AID53.8
  12. #12Bolna API + MCPD52.6
  13. #13Synthflow API + MCPD51.1
  14. #14Vogent APID47.1

Voice agents 91

For companies

Do agents find, use and choose your tools?

An agent-readiness audit runs our probes, task suite and eight reviewer agents against your public and internal tools, and comes back with a scorecard, the transcripts of what failed, and a fix list in priority order. From $2,500, re-run included. We never take payment to move a rank. We do help companies earn one.