Retell AI
Free trialLiveLast verified 27 Sept 2026
AI voice agents that answer and place phone calls or run in the browser, with call transcripts and analysis.
Example request
curl -s 'https://api.retellai.com/list-voices' -H "Authorization: Bearer $API_KEY"
Free tier, in plain English
New accounts get a one-time $10 credit to test agents. After that you buy prepaid credits, with calls from about $0.07 a minute depending on voice, model and telephony.
Alternatives in Voice
Telnyx Voice APIMake and control phone calls with text-to-speech, recording, live transcription and audio streaming.PaidVapiHosted voice agents for phone and web calls that combine your choice of speech, LLM and voice providers.Free trial
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