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Voice Agent Weekly

Developer platforms

Vapi

Developer platform for building voice AI agents.

vapi.ai

Our coverage of Vapi

We haven't published an article focused on Vapi yet. New coverage appears here automatically.

Where Vapi fits

Vapi (vapi.ai) 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 Vapi 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?