Vapi
Developer platform to build voice AI agents (phone calls).
Vapi is a developer platform for building real-time voice AI agents that make and take phone calls, handling speech, turn-taking and tool calls via API. Usage-based pricing with free credits.
About Vapi
Vapi is one of 13 ai agents tools in our directory. It's positioned for voice agents, AI phone support/sales.
With a free tier, Vapi stands out in ai agents — 11 of 13 tools in this category offer free access. The free plan is often limited in features or users, so verify that trial access covers your use case.
Key capabilities include Voice agents over phone, Real-time speech + turn-taking, Tool/function calling. These are standard in modern ai agents platforms. Evaluate whether the tool's depth in each area matches your plant's needs and technical maturity.
Best for: voice agents, AI phone support/sales, developers. When choosing between similar tools, validate that Vapi has integrations with your existing systems (data historians, SCADA, ERP) and that support covers your region.
Key features
- Voice agents over phone
- Real-time speech + turn-taking
- Tool/function calling
- Choice of STT/LLM/TTS
- API and SDKs
Pros
- Real-time voice infra
- Model-flexible
- API-first
Cons
- Developer-only
- Per-minute cost
Alternatives to Vapi
Retell AI
Build and deploy AI voice agents for calls.
Cartesia
Ultra-low-latency streaming text-to-speech for real-time voice agents
Compare Vapi
Vapi FAQ
Is Vapi free?
Vapi has a free tier you can start with; paid plans start from Usage-based (per minute).
How much does Vapi cost?
Vapi pricing starts from Usage-based (per minute). Check the official site for current plans.
What are the best alternatives to Vapi?
Top alternatives to Vapi include Retell AI, Cartesia.
What is Vapi best for?
Vapi is best for voice agents, AI phone support/sales, developers.
Reviewed by the ToolGlance editorial team · Last updated 2026-06-12
How we rate: ToolGlance scores combine pricing, core features, user-review signals and update frequency, compiled from public sources and vendor documentation — see our methodology. Figures are indicative and change often; always verify pricing and features on the vendor site before buying. Last updated 2026-06-12. Compiled by the ToolGlance editorial team.