Compare · Vapi vs Retell
Vapi vs. Retell: prices side by side
Vapi’s platform rate is $0.05/min, with speech-to-text, the model and the voice billed separately at cost. Retell publishes a pay-as-you-go range of $0.07 to $0.31 a minute. Komms is $0.08/min, with the phone call, the AI and a standard voice included, plus $15 a month per phone number.
Vapi vs. Retell vs. Komms
| Voice AI | Vapi | Retell | Komms |
|---|---|---|---|
| Published rate | $0.05/min platform rate | From $0.07/min; published range $0.07 to $0.31 | $0.08/min, billed in 6-second steps |
| What the rate includes | The platform. Speech-to-text, model and voice are billed separately, at cost | The page gives a range, $0.07 to $0.31 a minute | Phone call, AI and a standard voice |
| Calls at the same time | 4 on usage-only accounts; the Core package ($29/mo) includes 10; then $10/line/mo | 20 included, then $8/call/mo | No concurrency limits |
| 10,000 minutes a month | $500 platform rate, before speech-to-text, model and voice | $700 to $3,100 on the published range | $815 with one number |
Each price is the one on the company’s own pricing page. The pages and the dates we read them are in the tables below.
The same month, three ways
Take 10,000 minutes a month. Vapi’s platform rate is 10,000 × $0.05/min = $500, before the speech-to-text, model and voice bills, which Vapi passes through at cost.
On Retell’s published range, the same minutes are $700 to $3,100 (our math).
On Komms, 10,000 × $0.08/min = $800, plus $15 for one phone number: $815 a month, with the phone call, the AI and a standard voice included (our math). Bring us your bill: lower prices may apply at your volume.
Vapi prices, with sources
| Platform rate | $0.05/min | Speech-to-text, model and text-to-speech billed separately: "Vapi Hosting Cost Excludes Model Provider Costs" — "Model Provider Cost (STT, LLM, TTS) ... At cost ($0 if you bring your own API key)." |
| Call concurrency | $10/line/mo | Usage-only accounts include 4 concurrent calls; the $29/mo Core package includes 10; then $10 per line per month |
| Core package | $29/mo | 10 concurrent calls and 5 phone numbers included |
Vapi rates read from vapi.ai/pricing on 29 September 2026.
Retell prices, with sources
| Retell | Komms | |
|---|---|---|
| Call minutes | $0.07/min Retell’s own published pay-as-you-go range: $0.07–$0.31/min. | $0.08/min phone call, AI, voice included |
| Extra concurrency | $8/call/mo past 20 included concurrent calls | no concurrency fee |
Retell rates read from www.retellai.com/pricing on 29 September 2026. Komms rates read from kx21.com/komms on 3 October 2026.
What Komms has
- Build an agent as a flow of questions, with no code, and test it in Chat before a call goes out.
- Inbound and outbound calls, with transfer to a person.
- English and Spanish in real time.
- Bring your own voice, or use a standard one.
- Call tools mid-call through webhooks and APIs, and answer from a knowledge base.
- No concurrency limits.
The price is $0.08/min, with the phone call, the AI and a standard voice included. Billing is in 6-second steps. Each phone number is $15 a month. New accounts start with 50,000 free tokens, about 625 minutes, with no card.
Questions
Which costs more, Vapi or Retell?
Vapi’s platform rate is $0.05/min, with speech-to-text, the model and the voice billed separately at cost. Retell publishes a range of $0.07 to $0.31 a minute. Komms is $0.08/min, with the phone call, the AI and a standard voice included.
Do Vapi and Retell limit calls at the same time?
Vapi usage-only accounts include 4 concurrent calls and its Core package 10, then $10/line/mo. Retell includes 20 concurrent calls, then $8/call/mo. Komms is $0.08/min, with the phone call, the AI and a standard voice included.
Is Komms cheaper than Vapi and Retell?
At the bottom of Retell’s range, no: $0.07 a minute is a cent below Komms, and the range runs up to $0.31. Vapi’s $0.05/min platform rate is below Komms too, before the speech-to-text, model and voice it bills separately. Komms is $0.08/min with the phone call, the AI and a standard voice included, plus $15 a month per phone number.
Can I try Komms for free?
Yes. New Komms accounts start with 50,000 free tokens, about 625 minutes of calls, with no card.