A factual comparison for small businesses choosing between a ready-made receptionist and a build-your-own voice AI platform.
| Feature | AION | Retell AI |
|---|---|---|
| 24/7 Availability | ✅ | ✅ (once configured) |
| Appointment Booking | ✅ | ✅ (requires custom build) |
| Call Transfer | ✅ | ✅ (requires custom build) |
| Setup Time | < 10 min, self-service | Requires developer/API configuration |
| Price/month | $89 flat | Usage-based, $0.07-$0.31/min |
| Free Trial | ✅ | Varies by plan |
| AION Voice Receptionist | Retell AI | |
|---|---|---|
| What it is | Ready-made AI receptionist — no setup beyond entering your business info | Developer platform for building your own voice agent |
| Monthly price | $89/mo flat (300 min included) | No flat plan — usage-based |
| Per-minute cost | $0.15/min after included minutes | $0.07–$0.31/min depending on voice/model choice |
| Setup required | None — self-service form, live in under 20 min | Requires building/configuring your own agent (or hiring a developer) |
| Best for | A business owner who wants it working today | Developers/agencies building custom voice products |
Retell AI figures are their own publicly listed pricing as of the date this page was written — pricing changes over time, so please verify current rates directly on retellai.com before deciding. Retell AI is a serious platform (reported $40M ARR) — it's simply built for a different buyer than AION: developers assembling their own voice agent, not a business owner who wants a receptionist ready to go.