Head-to-head comparison
VapivsRetell AI
The two developer-friendly platforms for phone voice agents. Vapi is API-first and lets you choose every provider in the stack; Retell bundles telephony and models behind a visual flow builder and one per-minute price.
At a glance
| Vapi | Retell AI | |
|---|---|---|
| Category | Voice | Voice |
| Function | Voice agent platform | Voice agent platform |
| Pricing | Paid | Paid |
| Starting price | Pay per minute (platform fee from $0.05/min plus provider costs); free trial credit | Pay as you go from about $0.07/min; free trial minutes |
| Released | January 2024 | December 2023 |
Vapi
Pros
- Most flexible provider choice of the voice-agent platforms
- Developer-grade API and SDKs
- Scales from a hobby project to a call centre
Cons
- Per-minute costs stack across platform plus three providers
- Requires real engineering — not a no-code builder
- Voice quality and latency depend on the providers you pick
Retell AI
Pros
- Faster to a working agent than pure API platforms
- Bundled pricing is simpler to forecast
- Good compliance posture for regulated industries
Cons
- Less provider flexibility than Vapi
- Flow builder becomes unwieldy for complex conversations
- Enterprise features gated behind higher tiers
Which one should you pick?
Pick Vapi if
You have engineers, want to pick your own speech and language models, and need fine control over latency, interruptions, and tool calls.
See Vapi details →Pick Retell AI if
You want a working agent quickly, prefer designing conversations visually, and value simple, predictable pricing over maximum flexibility.
See Retell AI details →Bottom line
Vapi for engineering teams building something custom. Retell for operations teams who need a reliable agent without a build phase. Both scale to real call volumes.