All Stacks
Voice AI

Voice AI Developer Stack

Build phone agents, voice interfaces, and speech-powered products — with the transcription, synthesis, and conversation management tools developers use.

Tools in This Stack

1
Vapi logo
Vapi

Developer Tools

freemium

Build phone-based AI agents with sub-second response times. The developer platform for inbound and outbound voice AI that handles the full speech stack.

2
Deepgram logo
Deepgram

Developer Tools

freemium

Production-grade speech recognition API for real-time and pre-recorded audio — best-in-class accuracy, streaming support, and the reliability your voice applications need.

3
ElevenLabs logo
ElevenLabs

Audio

freemium

Clone a voice, narrate a script, or build a talking product — ElevenLabs sets the bar for speech that actually sounds human.

4
Retell AI logo
Retell AI

Automation

freemium

Build AI phone agents for inbound and outbound calls with natural latency, branching call logic, and built-in CRM integration — no voice infrastructure to manage.

5
ChatGPT logo
ChatGPT

Writing

freemium

Your go-to for drafts, research, brainstorming, and first passes on almost anything. The most versatile AI in the room.