Voice AI

Subcategory

AI that answers and makes phone calls — receptionists, support, and outbound. Tested and ranked.

Tap + Compareon any tools (up to 4) to see them side by side — same rubric, since they're all voice agents.

Top pick

Retell AI

Best-in-class voice quality and flexibility for technical teams — priced cheaper on the sticker than in practice.

6.8
/ 10

From Base $0.07/min (pay-as-you-go, no monthly minimum). Realistic all-in $0.13-$0.31/min once LLM + voice + telephony are combined. Free tier: $10 credits, 20 concurrent calls, first 100 AI-QA minutes free. Add-ons: Retell phone number $2/mo, SMS $20/mo, extra concurrency $8/call/mo, knowledge base $8/mo + $0.005/min, denoising/guardrails +$0.005/min, PII removal +$0.01/min, branded caller ID $0.10/outbound call. Enterprise is custom (reported to start around $8,000).

  • +Low, genuinely natural latency (~600ms) with a proprietary turn-taking model — among the best-sounding voice agents available
  • +No monthly minimum on pay-as-you-go, plus $10 free credits and 20 concurrent calls to test before spending
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Vapi

The most flexible, developer-first voice-agent platform — power at the price of assembly.

6.5
/ 10

From Build (pay-as-you-go): $0.05/min platform fee + pass-through STT/LLM/TTS/telephony (model costs $0 if you bring your own API keys); ~$0.15–$0.30/min all-in typical. 10 concurrent call lines included, then $10/line/mo. SMS/chat $0.005/msg. $10 free signup credit, no ongoing free tier. Add-ons: HIPAA $2,000/mo, zero-data-retention $1,000/mo. Scale plan is custom/volume-based (contact sales).

  • +Bring-your-own everything: pick any STT, LLM, TTS and telephony provider, so you're never locked into one vendor's voice or model
  • +Lowest headline platform fee in the category at $0.05/min, and $0 model markup if you supply your own provider API keys
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