Asisto vs Retell AI
A developer platform for building and testing voice agents, billed per minute across separate components.
The short answer
Retell AI is a build-your-own voice agent platform with strong testing tools, billed per minute across the model, speech and telephony you choose. Asisto is a finished receptionist with none of that assembly required.
The honest read
Retell is a capable platform with genuinely good simulation and testing tooling, and it lets you pick the underlying model rather than living with someone else’s choice. Its pricing reflects what it is: a per-minute rate assembled from the language model, speech synthesis, voice infrastructure and telephony, plus monthly fees for concurrency and phone numbers. That is normal for infrastructure and awkward for a business owner who wants to know what next month costs. Asisto is the opposite trade - fewer choices, a finished product, and a bill you can predict.
Where Retell AI wins
- Choice of underlying language model, so you can tune cost against quality yourself.
- Simulation and testing tooling that is genuinely strong for iterating on an agent.
- Pay-as-you-go with free credits, so you can prototype for almost nothing.
- The right foundation if you are building voice AI into your own product.
Where Asisto wins
- One predictable price rather than a per-minute total assembled from four components.
- Nothing to build, integrate or maintain - the receptionist is configured, not written.
- Phone numbers, messaging registration and caller ID handled rather than provisioned by you.
- Calendar booking, routing, SMS and transcripts included on day one.
Side by side
| Feature | Asisto | Retell AI |
|---|---|---|
| Answers calls 24/7 | Included | Once you have built and deployed an agent |
| Books appointments on your calendar | Native Google and Microsoft calendar booking | Build it yourself |
| Two-way SMS conversations | AI-handled, with MMS photo understanding | Build it yourself |
| Outbound calling | Browser dialer plus automated lead callback | Yes, programmatically |
| Business phone numbers included | Local, mobile and toll-free in 30 countries | Rented per number, per month |
| Languages | 58, switching mid-call | Depends on the models you pick |
| Multi-location | Unlimited locations on every plan | Build the routing yourself |
| CRM integration | Native HubSpot, plus API and webhooks | Build it yourself |
| Setup effort | Guided onboarding, live in about ten minutes | An engineering project |
| Built for | Business owners who want their phone answered | Developers and agencies building voice agents |
How each one charges
Rates change, so no figures are quoted here. What matters when you compare is the shape of the bill, and that is below.
Asisto
One price for the whole thing, with unlimited minutes. Either per appointment booked or a flat monthly rate.
See the plansRetell AI
Per minute, assembled from the language model, text-to-speech, voice infrastructure and telephony you select, plus monthly charges for concurrency, knowledge bases and phone numbers. Free credits to start.
Their pricing pageQuestions people ask
- How much does Retell AI actually cost per call?
- It depends on the components you choose, because the per-minute rate is assembled from the language model, speech synthesis, voice infrastructure and telephony, with monthly fees on top for concurrency and numbers. Their pricing page breaks each part down - budget for the total rather than the headline.
- Do I need a developer to use Retell?
- Realistically, yes, for anything beyond a template. Agents are built and integrated through APIs and webhooks. Asisto is configured through onboarding with no code at all.
- Is a purpose-built receptionist less flexible?
- Yes, and that is the trade. Asisto will not do something outside answering, routing, booking and messaging for a business. In exchange it does those things on day one without you building or maintaining anything.
Where this came from
Claims about Retell AI were checked against its own website on . Products change - if something here is out of date, the sources below are the place to check, and tell us so it gets fixed.
Hear it answer your phone before you decide
Call the demo line and talk to the receptionist yourself. No signup, no sales call.
Asisto for your industry
What changes when the calls are dental appointments rather than emergency plumbing jobs: the questions callers ask, what gets booked, and what a missed call is worth.
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