What Vapi AI does
Vapi provides a complete stack for building, testing, and deploying voice AI agents including real-time speech processing, function calling, and analytics. The SDK supports web and phone channels with sub-500ms latency.
How Vapi AI compares with its closest alternatives
All 5 closest alternatives have a free plan, as Vapi AI does. Among the 2 that list a starting price, the cheapest is Inkbox at $30 a month and the median is $65. 3 of the 5 offer an API, as Vapi AI does. Vapi AI offers a web app. Of the 3 alternatives with platforms on record, all 3 offer a web app. Vapi AI was founded in 2023; the alternatives were founded between 2023 and 2025. Vapi AI is based in San Francisco, United States; all the 3 alternatives with a known headquarters are in the United States too.