Vapi

Editorial Review

Vapi is the "voice agent stack as a service" answer for builders who don't want to assemble Twilio + Deepgram + ElevenLabs + an LLM provider themselves. The platform handles the full pipeline — call ingress, speech-to-text, LLM inference with tool use, text-to-speech, and call routing — and lets you swap any component (any LLM, any TTS provider) without changing your application code. Pricing is per-minute usage-based, which scales linearly with call volume. For teams building voice agents at scale, Vapi has become a leading infrastructure choice — competitors include Retell, Bland, and rolling your own. The trade-off is some lock-in to Vapi's orchestration; the win is shipping voice agents in days instead of weeks. For prototyping or low-volume use, a free trial credits balance is enough; production deployments quickly need paid tiers.

Key Features