Vapi
Market LeaderDeveloper-first platform for building, testing, and deploying AI voice agents at scale
👥 500K+ developers users
✓ Last verified: March 2026
Vapi is a developer-focused voice AI platform that provides APIs and tools to build, test, and deploy AI voice assistants. Handling speech-to-text, LLM processing, and text-to-speech in real time, Vapi supports 100+ languages with automated testing suites. Powering over 300M calls for 500K+ developers, it offers bring-your-own-model flexibility for production voice AI.
Our Ratings
5
Ease of Use
8
Output Quality
6
Value
Support
Versatility
Key Features
- ✓API-native architecture with thousands of configurable parameters
- ✓100+ language support for global voice operations
- ✓Automated testing suites to catch hallucination risks
- ✓Bring your own transcription, LLM, and TTS models
- ✓Tool calling for external API integration during live calls
- ✓A/B experiments for prompt and voice optimization
Best For
- 👍 Developer teams building custom voice AI products
- 👍 Companies needing production-grade voice agents
- 👍 Technical teams wanting model provider flexibility
Limitations
- ⚠️ Per-minute costs reach $0.13-0.31 with third-party services
- ⚠️ HIPAA compliance costs $1,000/month extra
- ⚠️ Requires backend development skills
Integrations
TwilioVonageSlackHubSpotZapierMake
Quick Facts
DifficultyAdvanced
Team sizeany
API accessYes
Mobile appNo
Data privacymedium
Advertisement
Ad: tool-sidebar · sidebar