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AI voice agent platforms
12 platforms and frameworks for building phone and voice AI agents. Platforms, APIs and open-source frameworks for AI agents that hold spoken conversations on the phone or web. Compare telephony support, latency, model choice and per-minute billing.
How to read this page. The tools are grouped by category and are not ranked. Pricing labels come from vendors' own pages when we could confirm them. Always verify plans and limits on the vendor's site.
Voice & Speech (9)
| Tool | What it does | Pricing | Link |
|---|---|---|---|
| Air AI | AI phone agents for inbound and outbound business conversations. | See site | Official site |
| Bland AI | Platform for automating inbound and outbound phone calls with AI voice agents. | See site | Official site |
| LiveKit | Open-source real-time audio and video infrastructure with a framework for voice AI agents. | Freemium | Official site |
| Pipecat | Open-source framework for building real-time voice and multimodal conversational agents. | Free | Official site |
| Retell AI | Platform for building AI voice agents for phone calls. | See site | Official site |
| Synthflow | No-code platform for building AI voice assistants. | See site | Official site |
| Ultravox | Speech-native voice AI model and platform for real-time voice agents; now part of Inworld. | Freemium | Official site |
| Vapi | Developer platform for building and deploying voice AI agents. | See site | Official site |
| Vocode | Open-source library for building voice-based LLM phone and web agents. | Free | Official site |
Customer Support (3)
| Tool | What it does | Pricing | Link |
|---|---|---|---|
| Leaping AI | Voice AI agents that handle inbound customer service phone calls. | See site | Official site |
| PolyAI | Voice AI agents for customer service calls. | See site | Official site |
| Regal | AI voice, SMS and chat agents for enterprise contact centers in sales and service. | See site | Official site |