Developers who want to pick every part
You choose the AI model and the voice for each agent, build call flows in detail and connect a long list of tools. You manage the cost of each part yourself.
Retell AI pricing, line by line
Retell AI charges $0.055 a minute for its voice platform, plus separate per-minute fees for the voice and the AI model, so most calls cost about $0.12 to $0.18 a minute before add-ons. Stemvo charges €0.15 a minute with everything included.
Retell figures from retellai.com/pricing, checked 16 October 2026. Prices change, so check their page too.
What a Retell AI minute is made of
Each part of the call is billed on its own line.
| Part of the call | Retell AI | Stemvo |
|---|---|---|
| Voice platform | $0.055 / min | €0.15 / min, all of it |
| Voice (text to speech) | $0.015 to $0.10 / min | |
| AI model | $0.0016 to $0.64 / min, by model | |
| Knowledge base | +$0.005 / min, +$8 per extra base a month | Included |
| Noise reduction, guardrails | +$0.005 / min each | Included |
| Phone number | $2 a month | At cost, or keep yours |
| Extra concurrent calls | 20 free, then $8 per line a month | Included |
What a month costs
Two common Retell AI setups next to Stemvo, inbound calls on your own phone line.
| Setup | 1,000 minutes | 10,000 minutes |
|---|---|---|
| Retell AI, budget voice and model | $115 | $1,150 |
| Retell AI, premium voice and model | $175 | $1,750 |
| Stemvo, everything included | €150 | €1,500 |
Budget: $0.055 platform + $0.015 voice + $0.045 model. Premium: $0.055 + $0.04 + $0.08. Add-ons not included.
Retell AI or Stemvo: which fits you
Both run AI phone agents. They are built for different people.
Businesses and agencies who want it done
One price per minute that stays the same, agents live the same afternoon, your own brand for agencies, and call data kept in Europe.
Start freeMoving from Retell AI
Bring your agents over in an afternoon.
14:00
Copy your instructions
Paste your Retell AI prompt and knowledge into a new Stemvo agent.
14:20
Test the same calls
Call both agents with your usual questions and compare.
14:45
Point your number
Forward your number or move your SIP trunk. Keep Retell running until you are happy.
Retell AI pricing questions
How much does Retell AI cost per minute?
Retell AI lists $0.07 to $0.31 a minute. That is $0.055 for the voice platform plus the voice and AI model you choose. Common setups land between about $0.12 and $0.18 a minute before add-ons such as a knowledge base.
Does Retell AI have a monthly fee?
Retell AI is pay as you go, billed per second. Phone numbers cost $2 a month, and concurrent calls above 20 cost $8 per line a month.
Is Stemvo cheaper than Retell AI?
It depends on the setup. Stemvo costs €0.15 a minute with voice, AI model and add-ons included, so the price stays the same whichever model or voice your calls need.
Does Retell AI host data in the EU?
Retell AI’s compliance page says it does not currently operate services within the European Union. Stemvo keeps call data in Europe.
Can I move my Retell AI agents to Stemvo?
Yes. Copy your prompt and knowledge into a new agent, test it with your usual calls, then forward your number or move your SIP trunk.
One price. One line on your bill.
Start with 60 free minutes. No card needed.
Start freeSign-up opens at launch. This is a preview.