Retell AI is a pay-as-you-go platform for voice and chat agents. You pay per minute for voice calls, with optional enterprise add-ons such as a dedicated server.
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Three other voice tools listed in this directory.
Voice
Bland AI runs phone voice agents billed per minute. Plans include Start and Build, with Enterprise options for on-prem and VPC deployment.
Voice
Vapi is a platform for building voice AI agents. Hosting is usage-based, and you choose your own transcriber, model, and voice providers.
Voice
Hopper is a Y Combinator-backed inference service for building realtime voice agents. It serves Gemma 4 31B for chat, audio understanding, Qwen 3 speech with voice cloning, and Nemotron transcription, and it connects to Pipecat, LiveKit Agents, and Vapi.