Voice agents
Vapi
Developer platform for building, testing and deploying voice AI agents.
The most flexible developer platform: pick your own models, voices and telephony.
Verified
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AI tool directory / Voice agents / Alternatives
Retell AI: Platform for AI voice agents that answer and make phone calls. These 8 voice agents do similar jobs, listed from highest to lowest RobotWise score. Descriptions come from each vendor's own site.
Developer platform for building, testing and deploying voice AI agents.
The most flexible developer platform: pick your own models, voices and telephony.
Verified
ElevenLabs' platform for building conversational voice and chat agents.
Verified
Open-source realtime infrastructure and Agents framework for voice, video and physical AI.
Verified
Enterprise voice AI platform for phone agents.
Verified
Mistral's speech-to-text and text-to-speech models plus a voice agent SDK for real-time calls over phone or web, on an EU-hosted API or self-hosted. Announced October 20, 2026.
Verified
xAI's speech-to-speech model, available in the Speech to Speech API at $0.08 per minute ($4.80 per hour), the same price as Grok Voice 2.0. Announced October 14, 2026.
Verified
Rime's speech-to-speech model for enterprise voice agents, with an inspectable text checkpoint before it speaks and tool calls in parallel with speech. Launched October 28, 2026.
Verified
End-to-end voice AI platform with in-house telephony for deploying AI agents that automate sales and support phone calls.
Verified