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Vapi vs Retell AI: which platform actually costs less
Both of these platforms lead with a number that is not the bill. Vapi advertises $0.05 a minute, but the $0.05 is the Vapi platform fee only; starts with $5 of free credits. Retell advertises $0.07, but the $0.07 figure is the cheapest possible component mix. Neither figure survives a real deployment. This page runs both platforms through the same two volumes with the realistic component mix each vendor names on its own pricing page, not a guess.
The short answer. At realistic settings the two are closer than their headlines suggest, and the component mix decides more than the brand. Retell's realistic build costs $290 at 2,000 minutes a month including the phone number, which sits above Vapi's own $160 to $260 range for the same volume. Pick Vapi if you already hold your own API keys and want at-cost billing on every component. Pick Retell if you want every component priced on one page, a stated phone number cost, and twice the free concurrency before line fees start.
How does the headline rate compare with the real one?
Read past the number on each homepage and the gap is enormous on both sides, just not the same shape.
| Platform | Headline | What the headline covers | Realistic rate |
|---|---|---|---|
| Vapi By Usage | $0.05/min | Vapi's own margin only. Speech to text, the model, the voice and telephony are all extra, billed at cost. | $0.08 to $0.13 |
| Retell Pay as you go | $0.07/min | The cheapest configuration that exists: basic voice, the cheapest model, no extras. | $0.14, plus $10/mo for the phone number |
Vapi's realistic range is 1.6 to 2.6 times its headline. Retell's realistic rate is 2.0 times its headline. Both price lists let you work the gap out, Retell component by component and Vapi through its calculator; neither leads with it.
What do 500 minutes a month cost?
A modest month, roughly 100 calls at five minutes each.
| Platform | Headline total | Realistic total |
|---|---|---|
| Vapi | $25 | $40 to $65 |
| Retell AI | $45 (incl. $10 phone) | $80 (incl. $10 phone) |
Working: Vapi's headline is 500 minutes at $0.05, or $25, with a phone number already included, because every Vapi package ships with at least one. The realistic range is 500 minutes at $0.08 to $0.13, or $40 to $65. Retell's headline is 500 minutes at $0.07 plus the $10 phone number, or $45. Its realistic figure is 500 minutes at $0.14 plus the phone number, or $80, which lands above Vapi's own realistic range for the same month.
What do 2,000 minutes a month cost?
A busy month for a small agency running multiple client numbers, roughly 400 calls at five minutes each.
| Platform | Headline total | Realistic total |
|---|---|---|
| Vapi | $100 | $160 to $260 |
| Retell AI | $150 (incl. $10 phone) | $290 (incl. $10 phone) |
At this volume the gap between headline and reality stops being academic. Budgeting Vapi at $100 instead of the realistic $160 to $260 misses the true cost by $60 to $160 a month. Budgeting Retell at $150 instead of $290 misses it by $140. Neither gap is small enough to round off.
Which fixed costs does neither headline rate include?
Per-minute rates are only half the bill. Both platforms charge for concurrency, and only one prices telephony and compliance in writing.
| Cost | Vapi | Retell AI |
|---|---|---|
| Concurrent calls included | 10 lines | 20 lines, double Vapi's allowance |
| Extra concurrent line | $10/mo each | $8/mo each |
| Phone number | Not priced: telephony comes from your own carrier | $10/mo, stated on the page |
| Compliance | HIPAA: $2,000/mo, stated on the page | BAA included on Enterprise; Enterprise itself is not priced |
Retell is more generous on concurrency and more specific about what a phone number costs. Vapi is more specific about what HIPAA costs, and Retell is not specific about its Enterprise tier at all. Neither company publishes everything; they just leave out different pieces, which is exactly why both need the realistic figure above instead of the number on the homepage.
Who should pick which?
You already hold your own API keys
Vapi. At-cost billing on transcription, the model and the voice means $0.05 really is close to the true platform margin if you are already paying those bills elsewhere. Budget the $0.08 to $0.13 range, not the headline, and add $10 a line past 10 concurrent calls.
You want one vendor and a stated worst case
Retell AI. A named $10 phone number, 20 free concurrent lines instead of 10, and a realistic rate of $0.14 that Retell states on its own page rather than leaving you to estimate it.
You do not want to assemble anything
Neither. Both are developer platforms with a build phase. If that is not what you signed up for, Rosie and NextPhone are finished products with a published monthly price and no components to choose. See Vapi alternatives and Retell AI alternatives for the fuller list, or Bland AI alternatives for the one per-minute platform with a single rate in this market.
Check both prices before you build anything
Read from each vendor's own pricing page on 2026-10-21. Neither Vapi nor Retell runs an affiliate program on this site, so these links carry no commission either way.
Where to go next
- Vapi alternatives, for anyone who wants out of the platform entirely
- Retell AI alternatives, including when to move to a single rate
- Bland AI alternatives, the one per-minute platform in this market with a single honest rate
- Every Retell AI plan, in full
- Best AI receptionists in 2026, if a platform was never what you needed
- The hidden costs of AI receptionists, every pass-through in this market in one place
- Per minute against flat rate, with the break-even minutes worked out
- Why Vapi has no pricing page of its own, or every published price in one table
Frequently asked questions
Is Vapi or Retell AI cheaper?
Neither headline number is what you pay. Vapi advertises $0.05 a minute, which is platform margin only, and our realistic range, built from the components it bills at cost, is $0.08 to $0.13. Retell advertises $0.07, which is the cheapest possible component mix, and a realistic build runs $0.14. At 2,000 minutes a month that is $160 to $260 for Vapi against $290 for Retell including the phone number. Retell's realistic figure sits above Vapi's range, so at realistic settings the two are closer than the headlines suggest, and whichever component mix you actually choose decides it more than the brand.
What is actually included in Vapi's $0.05 a minute?
Vapi's own platform fee and nothing else. Speech to text, the language model and the voice are billed at cost, meaning zero markup if you bring your own API keys, and telephony is not included or priced at all. Ten concurrent lines are included; extra lines cost $10 a month each, and HIPAA is $2,000 a month.
What is actually included in Retell's $0.07 a minute?
The cheapest configuration Retell can build: basic voice, the cheapest available model, no extras. A usable version (our estimate from their component prices: voice infrastructure $0.055 plus ElevenLabs Flash $0.04 plus GPT 4.1 at $0.045) comes out at $0.14 a minute, 2.0 times the headline. A phone number is a named $10 a month, and twenty concurrent lines are free before the $8-a-line charge starts.
Which one should a developer actually choose?
If you already hold your own API keys for transcription, the model and the voice, and you want to tune each one, Vapi's at-cost billing rewards that setup and its $0.05 margin is genuinely small. If you want a single vendor with two named price points, a phone number that costs a stated $10, and twice the free concurrency, Retell publishes more of the bill up front. Neither platform is the right pick if you do not want to assemble anything: see Vapi alternatives and Retell AI alternatives for the finished products both eventually point to.