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Voice Agent Weekly

Developer platforms

Retell AI

Platform for building and deploying conversational voice agents.

retellai.com

Our coverage of Retell AI

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Where Retell AI fits

Retell AI (retellai.com) is listed in our directory under developer platforms: APIs and SDKs for building custom phone and voice agents.

Developer platforms expose APIs and SDKs for assembling a voice agent from speech recognition, a language model, speech synthesis and telephony. Teams trade setup effort for control over prompts, models, call flows and integrations.

Questions to ask developer platforms

Generic evaluation questions for this category — put them to Retell AI and to its peers.

  1. Which speech-to-text, LLM and text-to-speech providers can you choose, and can you bring your own keys?
  2. How is usage billed (per minute, per call, platform fee) and which provider costs are passed through?
  3. What end-to-end latency does the vendor document, and under which configuration?
  4. How are telephony numbers, SIP trunking and call transfer handled?
  5. What logging, call recording and analytics are available, and where is data stored?