Compare Lab
Retell AI vs Vapi
Choose Retell when one team wants to configure, test and review calls in a connected workflow. Choose Vapi when your engineering team wants to own provider selection and application behavior.
Choose Retell when one team wants to configure, test and review calls in a connected workflow. Choose Vapi when your engineering team wants to own provider selection and application behavior.
40 jointly documented catalog fields. This measures evidence coverage, not equivalent quality or an overall winner.
Test opening hours, booking conflicts and an unanswered transfer.
Start where the records differ.
Values and evidence states are compared together. Shared facts follow the differences; Unknown never means No.
| Decision point | Retell AI | Vapi |
|---|---|---|
| Billing modelDifferent records | component-stack | platform-plus-pass-through |
| Billing unitShared state | minute | minute |
| Bring your telephonyShared state | Yes | Yes |
| Bring your modelShared state | Yes | Yes |
| Warm transferShared state | Yes | Yes |
| HIPAA pathShared state | Yes | Yes |
Your requirements & next steps
Your requirements
Ready-made / AI receptionist · Strict evidence mode
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Reviewed current public offer; retain original billing scope and units.
Reviewed current public offer; retain original billing scope and units.
Reviewed current public offer; retain original billing scope and units.
Reviewed current public offer; retain original billing scope and units.
Reviewed current public offer; retain original billing scope and units.
Reviewed current public offer; retain original billing scope and units.
Zero platform fee is not zero total fixed cost.
Reviewed current public offer; retain original billing scope and units.
Paid extras$8/slot/month and$8/KB/month; usage separate.
Reviewed current public offer; retain original billing scope and units.
Reviewed current public offer; retain original billing scope and units.
Reviewed current public offer; retain original billing scope and units.
Reviewed current public offer; retain original billing scope and units.
Reviewed current public offer; retain original billing scope and units.
Reviewed current public offer; retain original billing scope and units.
Reviewed current public offer; retain original billing scope and units.
A headline configuration range is not a ceiling on telephony, model, add-on or burst charges.
Provider choices, tokens, carrier and optional support/compliance fees are not fixed by minutes alone.
Research conclusion about cost completeness, not a vendor capability.
Research conclusion about cost completeness, not a vendor capability.
Anyone with this link can view the encoded decision criteria.
Vendor documentation establishes a claim. Public model benchmarks are separate context, not measurements of these platforms.
Open saved comparison ↗What to verify together.
Retell AI
The advertised price band is not a ceiling for every model configuration.
Voice-agent configuration range $0.07–$0.31/min · V3.3 evidence review · Published configured-agent range lower reference; not a guaranteed all-in floor or ceiling
Excluded / confirm: Complete cost cannot be established from this reference. A headline configuration range is not a ceiling on telephony, model, add-on or burst charges. · Telephony, selected LLM/TTS, add-ons and concurrency burst can add charges
Reviewed current public offer; retain original billing scope and units.
Vapi
The $0.05 hosting charge is only one component of the call bill.
$0.05/min Vapi hosting · V3.3 evidence review · Hosting only; model, speech, carrier and compliance/support add-ons extra
Excluded / confirm: Complete cost cannot be established from this reference. Provider choices, tokens, carrier and optional support/compliance fees are not fixed by minutes alone. · LLM, transcriber, voice and carrier charges; HIPAA add-on $2,000/month
Reviewed current public offer; retain original billing scope and units.
The evidence overlap.
Both records have documented values for Product type, Call direction, Technical setup, Human fallback, Warm transfer, Cold transfer, Transfer with context, Pricing model, Published numeric pricing, SIP trunking, Bring your telephony, Telnyx and additional fields shown in Compare. Matching availability does not measure behavior under your call conditions.
Run the same booking, tool failure and unsuccessful human-transfer cases. Record both outcomes and billable units before signing a deployment agreement.
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