Picks / Voice & TTS
Best platform to build AI voice agents
One pick, one backup, real prices from our database. Rankings are not for sale.
The pick
Vapi
Vapi gives developers the building blocks for phone and web voice agents: you plug in your choice of speech-to-text, LLM and voice, add tools and get a phone number. It's flexible enough for custom agents while handling the hard parts like latency and interruptions.
- Starting price
- Not verified — check current price
- Free tier
- Yes
- Skill level
- advanced
Last verified: 2026-10-15
Setup guide
- Sign up and create an assistant.
- Pick your transcriber, model and voice.
- Write the system prompt and add tools/functions.
- Attach a phone number or web widget.
- Test calls and review transcripts before going live.
Backup pick
Retell AI
Voice AI agent platform for calls. Good for: Call-center agents.
- Starting price
- Not verified — check current price
- Free tier
- Yes — page says: “$0, pay only for what you use…”
- Skill level
- intermediate
Last verified: 2026-10-15
Visit Retell AI ↗ Full Retell AI profile →Prices change; confirm on the official site before paying. How we rank.