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Fonoster vs Vapi
People
Price
Usage-based
Usage-based
AI Voice Agents
Annual estimate10 people, entry price
Usage-based
Usage-based
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AI Voice Agents
Overview
Focus
AI Voice Agents
AI Voice Agents
Product
Open-source voice and AI telephony infrastructure for building programmable voice agents and SIP applications.
Vapi is a developer platform for building, testing, and deploying voice AI agents that can handle phone calls with natural conversation capabilities and tool integrations.
Headquarters
San Francisco, California
San Francisco, California
Company size
11-50 employees
11-50 employees
Founded
2020
2023
Pricing details
Published rate
Usage-based
Usage-based
Free options
Free plan, Free trial
Free plan
Source updated
Oct 29, 2026
Oct 29, 2026