Compare · Cartesia
Cartesia vs. Komms: Sonic, Managed Agents and price, 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
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Cartesia makes Sonic, a fast AI voice, and sells Managed Agents, voice agents built on it. Komms is a whole phone and chat agent with a standard voice included. Here is what each one publishes, from Cartesia’s own pages. Where Cartesia does not say, we say so.
Cartesia vs. Komms
| Fact | Cartesia | Komms |
|---|---|---|
| What it is | Sonic is a voice: it turns text into speech. Managed Agents are its phone and web voice agents. | A voice and chat agent for your phone lines and website. |
| Price per minute | Managed Agents cost $0.06/min for call time, plus $0.014/min on a Cartesia phone number. The AI model is billed as tokens on top, free “for a limited time” for agents built in its web app. | $0.08/min, all in: the phone call, the AI model and a standard voice. Billed in 6-second steps. Each phone number is $15 a month. |
| Plans | Free, Pro $5/mo, Startup $49/mo and Scale $299/mo. Each plan includes 1 to 10 phone numbers. | No plan fee. |
| Calls at once | 8 on Free, 12 on Pro, 20 on Startup, 60 on Scale. | No limit on calls at once, and no charge for them. |
| Free start | Free plan with about 17 minutes of agent calls. | 50,000 free tokens, about 625 minutes of calls, with no card. |
| Booking appointments | No built-in calendar listed. Booking runs through a webhook to your own server. | Books into Google or Microsoft calendars on the call. |
| Spanish | Spanish is supported. Each agent has one main language; switching during a call is not listed. | English and Spanish. The agent asks the caller before it switches. |
| Handing a call to a person | Cold transfer to a phone number or SIP address, on a Twilio or SIP-trunked call. | Blind or announced, with 1 to 10 tries. |
| Knowledge base | Upload documents into folders. | Yes, on its own step, in a support, sales or general style. |
| Your systems during the call | Webhook tools call your server. | API tools on any step look up or update your CRM or any API. |
| Your own voice | Cloned voices, Pro plan and up. | Bring your own voice, or use a standard one. |
| Records and transcripts | Audio and transcript of every call, on by default. | Transcripts with each turn’s reply timing. |
| Speed figure it publishes | Sonic: “first audio in under 90ms.” The clock stops at the first sound out of the voice model. | A reply starts in a median of 77 ms (October 21–22, 2026). The clock stops when the reply is handed to the voice, so the two figures are not the same measure. Numbers and method |
Cartesia facts read on cartesia.ai/pricing, cartesia.ai/sonic, cartesia.ai/agents and docs.cartesia.ai on 25 October 2026, in its own words where quoted. Komms price: kx21.com, 3 October 2026.
Other things to know
- Per minute, a Cartesia agent on a Cartesia number is $0.06/min plus $0.014/min, about $0.074 (our math), before the AI model once its free offer ends. Komms is $0.08/min with the model included.
- Cartesia’s older code-first agents, the Line SDK, stop being hosted by Cartesia on December 1, 2026. The SDK stays open source for you to host yourself.
- Sonic speaks 44 languages from one model, and a voice can be cloned from 10 seconds of audio.
- You can bring your own carrier to Cartesia over a SIP trunk or Twilio; then your carrier bills you for the call.
Start Komms free, or contact us to find out how to save 50% off your current Voice AI, Consent Recording, CRM and Call Tracking costs.
Also compared: Every voice AI platform, feature by feature · ElevenLabs · Vapi · Retell · Bland · AI Rudder
Questions
What is Cartesia Sonic?
Sonic is Cartesia’s text-to-speech model: it turns an agent’s words into a voice, with first audio in under 90 ms by Cartesia’s own figure. It does not answer calls by itself. Komms is a whole phone and chat agent, with the phone call, the AI model and a standard voice included.
Is Cartesia cheaper than Komms?
Per minute, slightly, today. A Cartesia Managed Agent is $0.06/min plus $0.014/min on a Cartesia number, and the AI model is free for agents built in its web app for a limited time. Komms is $0.08/min all in, model included, with no plan fee and no limit on calls at once.
How many calls at once can a Cartesia agent take?
Cartesia lists 8 calls at once on its free plan, 12 on Pro, 20 on Startup and 60 on Scale. Komms has no limit on calls at once, and no charge for them.
Can Cartesia agents book appointments?
Cartesia’s pages list no built-in calendar; booking runs through a webhook to your own server. Komms books into Google or Microsoft calendars on the call, offering the first free time or letting the caller pick.