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Build, test, and deploy AI phone agents
Pros
- $10 free credits to start
- 20 free concurrent calls
- Lower base than many bundled tools
- Enterprise rate can drop to $0.05/min
Cons
- No free tier
- True cost $0.11-$0.31/min
- Concurrency/knowledge bases cost extra
- Enterprise starts at $8,000
✓ Where it shines / best for
- Developers building AI phone agents for sales or support
- Call centers automating inbound/outbound calls
- Businesses needing multilingual voice automation with analytics
✕ Not the best fit for
- Simple text-to-speech narration needs
- Consumers wanting a flat low monthly subscription
- Offline/on-device voice processing
Features
- ✓ API access
- ✓ Free tier
- ✓ Real-time
- ✓ Multilingual
- ✓ Voice agents
- ✓ Speech To Speech
- ✓ Knowledge base
- ✓ Telephony
- ✓ Batch Calls
Pricing
| Plan | Price | Billing | Notes |
|---|---|---|---|
| Free / Pay-as-you-go (base) | 20 concurrent calls free | free tier | Free concurrency allotment; sign up and pay only for usage |
| Voice engine (TTS) | $0.07-0.08 | per minute | Underlying voice synthesis usage component |
| Speech to text | $0.07 | per minute | STT usage component |
| LLM | Varies | per minute | Depends on chosen model; passed through |
| Retell platform fee | $0.15 | per minute | Platform fee on top of voice/STT/LLM usage; includes 30+ languages, Knowledge Base, Batch Calls, custom analytics |
| Pay as you go (total) | $0.15/min platform fee + usage | per minute | Effective per-minute cost is platform fee plus voice + STT + LLM |
| Enterprise | Custom | custom | Volume discounts, dedicated support, SLA, HIPAA |
Pricing verified from the official source. Prices change often — confirm on the vendor's site before buying.
Specifications
| billing | per-minute + components |
| free_concurrency | 20 calls |
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A full review is being generated for this product and will appear here shortly.