Compare · AI voice agent platforms
AI voice agent platforms compared: every feature, side by side
Komms reduces talk time 30–40% vs. your agents on the same script.
Komms pricing:
- $0.08 a minute, phone call included
- $15/mo per phone number
Start free — 625 minutesFree 30 Min Demo
Updated
Seven voice AI platforms, feature by feature, from each vendor’s own pricing page and docs. Where a vendor does not say, we write “Not listed”.
Komms vs. Vapi, Retell, Bland, ElevenLabs, Synthflow and Cartesia
| Feature | Komms | Vapi | Retell | Bland | ElevenLabs | Synthflow | Cartesia |
|---|---|---|---|---|---|---|---|
| Per-minute price | $0.08/min all in | $0.05/min platform rate, plus speech, model and voice | From $0.07/min | Start plan $0.14/min | $0.08/min for extra minutes, plus the AI model | Enterprise contracts from $30,000/yr | $0.06/min, plus the AI model |
| Phone calls included in that price | Yes, inbound and outbound | No, billed by your phone provider | No, telephony is a separate line | No, billed separately | No, your phone provider bills you | Set in the contract | No, $0.014/min on its numbers |
| Monthly platform fee | None | None on usage only; Core $29/mo | None | None on Start; Build $299/mo | Free plan; paid plans from $22/mo | Enterprise contract | Free plan; paid plans from $5/mo |
| Calls at the same time | No limit | 4, then $10/line/mo | 20, then $8/call/mo | 10 on Start | 4 on the free plan | Set in the contract | 8 on the free plan |
| Books into Google and Microsoft calendars | Yes, both | Google Calendar | Calendly, Cal.com, GoHighLevel | Cal.com | Google Calendar, Cal.com | Cal.com, GoHighLevel | Not listed; a webhook to your server |
| English and Spanish on the same call | Yes, asks the caller before switching | Yes | Detects the language of each reply | Yes | Yes, with its language detection tool | Yes | Spanish supported; one main language per agent |
| Bring your own voice | Yes | Yes | Yes, import or train a clone | Yes, clone your own | Yes, Starter plan and up | Yes, clone or import | Yes, cloned voices, Pro plan and up |
| Transfers the call to a person | Yes | Yes, warm or blind | Yes, cold or warm | Yes; warm transfer on Enterprise | Yes, blind or conference | Yes, cold or warm | Yes, cold |
| Knowledge base it answers from | Yes | Yes, uploaded files | Yes, URLs, documents and text | Yes, upload, website or text | Yes, files, URLs or text | Yes, documents, URLs and site crawls | Yes, uploaded documents |
| Calls your own API during the call | Yes, API tools on any step | Yes | Yes | Yes | Yes | Yes | Yes, webhook tools |
| Call transcripts | Yes, with each turn’s reply timing | Yes | Yes | Yes | Yes | Yes | Yes |
| Free to start | 50,000 free tokens, no card | $5 in free credits | $10 in free credits, no card | Free credits and a number, no card | 15 free minutes, non-commercial use | Demo only | Free plan, about 17 minutes |
Each cell names the cheapest plan that includes the feature. “Not listed” means the vendor’s own pages do not mention it. A lower per-minute rate can cost more once phone calls and the AI model are added on top. Read on 25 October 2026: Vapi · Retell · Bland · ElevenLabs · Synthflow · Cartesia, plus each vendor’s docs. Komms also charges a monthly fee for each phone number.
Komms pricing:
- $0.08 a minute, phone call included
- $15/mo per phone number
Start free — 625 minutes How Komms works AI receptionist pricing, low to high What’s new in Komms
Also compared: Vapi · Retell · Bland · ElevenLabs · Synthflow · Cartesia · Vapi vs. Retell
Questions
Which AI voice agent platforms include phone calls in the price?
Komms is $0.08/min with inbound and outbound phone calls, the AI model and the standard voice included. Vapi, Retell, Bland, ElevenLabs and Cartesia bill phone calls separately on their own pages; Synthflow sets it in the contract.
Is Komms cheaper than Bland?
Yes, per minute. Komms is $0.08/min with phone calls included. Bland’s Start plan is $0.14/min with no platform fee, and its pricing page says phone calls are billed separately.
Which voice AI platforms book into Google and Microsoft calendars?
Komms books on the call into Google or Microsoft calendars. Vapi and ElevenLabs list Google Calendar; Retell, Bland and Synthflow list Cal.com and other booking tools; Cartesia uses a webhook to your server. None of the other six lists Microsoft.
Does Komms limit calls at the same time?
No. Komms has no limit on calls at the same time. Vapi includes 4 on usage only, Retell 20, Bland 10 on Start, ElevenLabs 4 and Cartesia 8 on their free plans, with more for a fee or a higher plan.