Vapi

✨Key Features

• ▸API-Native & Highly Configurable: Everything exposed via API (TypeScript/Python SDKs, cURL); thousands of settings for prompts, voices, flows, tool calling, knowledge bases, and custom logic.
• ▸Bring Your Own Stack: Integrate your preferred LLMs (GPT-4o, Claude, Gemini, etc.), TTS providers (ElevenLabs, Play.ht, Azure), STT (Deepgram, AssemblyAI), or self-hosted models for full control.
• ▸Real-Time Performance: Sub-500ms voice-to-voice latency, 99.99% uptime, scales to millions of calls daily; supports filler words, interruptions, and natural conversation flow.
• ▸Advanced Tools: Tool calling for API actions (e.g., fetch data, book appointments), automated testing suites, A/B experiments on prompts/voices, multilingual support (100+ languages).
• ▸Integrations & Deployment: 40+ apps, telephony (SIP/phone numbers), web widgets, webhooks; enterprise-grade security (SOC2, HIPAA, PCI), guardrails against hallucinations.
• ▸Use Cases: Customer support, outbound sales/prospecting, appointment scheduling, market research, receptionists, lead qualification; used by companies saving engineering hours.
• ▸Developer-Friendly: Templates, automated testing, monitoring dashboard, community support; quick setup for production-ready agents.
• ▸Notable Stats: Powers 400,000+ daily calls; trusted by innovative teams for reliable, high-volume voice AI.