Retell AI
Voice engine for conversational AI with native speech-to-speech models and turn-taking logic.
Ranked #4 of 16 in Voice AI & Inbound Calling by Autonomous Execution Score.
Only the top 3 earn a ranked badge. How badges work → Retell AI is an autonomous voice AI and telephony agent platform starting at $0/month. It achieves an Autonomous Execution Score of 72/100 and integrates natively with Twilio, Cal.com, OpenAI. Its key operational strength is state-of-the-art conversational turn-taking, while primary tradeoffs include primarily developer-facing.
- Autonomy
- 72/100
- Value
- 5.40
- From
- $0/mo
- Pricing
- freemium
- Updated
- Nov 2026
Strengths
- State-of-the-art conversational turn-taking
- Zero audio stuttering
- Direct Cal.com appointment booking
Tradeoffs
- Primarily developer-facing
- Limited out-of-the-box pre-built templates
Integrations
- Twilio
- Cal.com
- OpenAI
- Webhooks
Estimate your monthly cost
$110/mo
On the Pay as you go plan. Uses the vendor's $0.11/min example. Published range is $0.07 to $0.31.
How this score is built
- Autonomy base
- (100 − 25 human effort) × 0.8
- Integrations
- +12
- Setup friction
- −0
- Value inputs
- 22 features, 4.8 rating
Human effort, feature count and rating are editorial estimates, not test results.
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