Vapi
The Voice AI infrastructure for developers to build conversational agents in minutes.
Voice AIDeveloper ToolsInfrastructureAPICustomer Support Agents
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LinkStart Verdict
We tested Vapi and found it to be the 'Stripe for Voice AI'. It elegantly abstracts the messy glue code required to connect transcribers, models, and synthesizers.
Why we love it
- Incredible Developer Experience (DX) with the CLI.
- Significant reduction in latency compared to DIY solutions.
- Flexible architecture allows swapping models easily.
Things to know
- Voice AI reliability relies heavily on upstream providers (e.g., Twilio quality).
- Cost can stack up (Vapi cost + LLM cost + Telephony cost).
About
Vapi is the orchestration layer for Voice AI, abstracting the complexity of Speech-to-Text, LLMs, and Text-to-Speech into a single, easy-to-use API. It handles the difficult engineering challenges of voice agents—like turn-taking, interruption handling, and latency optimization—so developers can focus on conversation logic. With a powerful CLI and SDKs, Vapi integrates seamlessly with Twilio, Vonage, and your existing tech stack (including n8n and Make) to deploy human-like voice assistants.
Key Features
- ✓Real-time turn-taking & interruption handling
- ✓Sub-second latency orchestration
- ✓Integrations with Twilio/Vonage
- ✓Supports BYO LLM (OpenAI, Groq, etc.)
- ✓Developer CLI & Webhooks