Vapi

Vapi is an AI voice solution for developers, that lets enterprises deploy human-like voice agents in minutes. It can be used for building a voice product or for handling calls, Vapi’s infrastructure and APIs help to make it easier. Users can build voice agents with the flexibility and customizability of raw code, without having to build the entire voice stack from scratch.

Some of its features include:

• Multilingual - Talk to agents in English, Spanish, Mandarin, or one of 100+ other supported languages.
• API-native - Everything is exposed as an API, with 1000s of configurations and integrations.
• Automated testing - Design test suites of simulated voice agents to identify hallucination risks before going to production.
• Bring your own models - Bring your own API keys for transcription, LLM, or text-to-speech models. Or, plug in self-hosted models.
• Tool calling - Plug in APIs as tools to intelligently fetch data and perform actions on your server.
• A/B experiments - Test different variations of prompts, voices, and flows to continuously optimize performance.