Voice AI platform · built in the EU

The European voice AI platform. Phone agents that sound local.

Build an AI receptionist for your business, or sell voice agents under your own brand. Native voices in ten languages, data kept in the EU, one price per minute.

Build your agent White label for agencies

· 60 free minutes · no card

Sample greetings EU voices

Same receptionist, same script. Tap a city to hear her.

Who it’s for

One platform. Three ways in.

For businesses

An AI receptionist that answers every call.

Takes calls day and night, answers questions, books appointments in your calendar and sends you a summary. Live in an afternoon.

See the AI receptionist For agencies

Sell voice agents under your own brand.

Your logo, domain and invoices. A sub-account per client, your own price per minute, your margin on every call.

See white label For developers

An API for voice agents, hosted in the EU.

Create agents and calls over REST, get events by webhook, bring your own SIP trunk, import agents from Retell or Vapi.

See the API

Your callers don’t speak American English.

A Dutch receptionist shouldn’t sound like a tourist.

Many platforms are built for American English first. Callers hear the accent in the first second and ask for a human.

Someone will ask where the call went.

A privacy officer, a client or a patient. Speech, transcript and recording often pass through US services. With Stemvo every layer runs in an EU region, and you can show which one.

Five vendors, five invoices, a cost that moves.

Phone line, speech, model, voice and platform usually bill separately. We put them in one price per minute, so you know what a call costs before it happens.

Languages

Same receptionist. Ten languages.

Every language has its own voice, built for it. Not an English voice reading a translation.

Amsterdam · Dutch

How it works

Build it. Connect it. It answers.

Build: Pick a template for reception, bookings or lead qualification and describe your business in plain words. Test it in the browser first.
Connect: Get a local number or forward the line you have. Connect your calendar so it can book, move and cancel.
Answer: It picks up in the caller’s language, handles what it can, passes the rest to a person and sends you a summary.

Build your agent

Incoming call · +31 20 555 013400:00

Mila Goedemiddag, tandartspraktijk De Vries, u spreekt met Mila.
CallerIk wil graag een afspraak voor een controle.
Checked calendar · Thu 10:30 free
Mila Donderdag om half elf kan. Zal ik die voor u vastzetten?
CallerJa, graag.
Booked · confirmation sent by SMS
Summary emailed to the practice

ThursdayPractice calendar

09:45Check-up · Jansen

10:30FreeBooked · New patient

11:15Free

Dutch · EU regionScroll to play the call

For agencies

Your name on everything. Never ours.

Dashboard, login page, emails, invoices and the web address. Try it with your agency.

Your agency name

Brand colour

Custom domain and SSL
Client sub-accounts with their own numbers
Emails and invoices sent in your name
Your own price per minute for each client

app.northwinddigital.eu

Calls answered3,912

Minutes9,480

Your margin€1,422

Client	Lang	Minutes	Status
De Vries Tandartsen	NL	2,140	Live
Bäckerei Krüger	DE	1,385	Live
Cabinet Martin	FR	3,020	Live
Hotel Stella	IT	2,935	Testing

For developers

Everything in the dashboard. Also in the API.

Create agents, start outbound calls and read transcripts over REST. Webhooks for every call event, your own SIP trunk if you have one, and an importer for Retell and Vapi agents.

REST API and webhooks
SIP trunking and number porting
Import agents from Retell or Vapi

Get an API key

# Start an outbound call in Dutch
curl https://api.stemvo.eu/v1/calls \
  -H "Authorization: Bearer $STEMVO_KEY" \
  -d '{
    "agent_id": "agt_dentist_nl",
    "to": "+31 20 555 0134",
    "language": "nl",
    "region": "eu-west"
  }'

# 201 Created
{ "id": "call_8f2c", "status": "ringing" }

Pricing

One price per minute. Everything included.

€0.15/ minute

Speech, language model, voice and platform included
Phone numbers at cost
No monthly platform fee, no setup fee
Spend cap and an alert at 80%

Example: a practice that takes 600 minutes of calls a month pays €90.

Start free with 60 minutes

For agencies: what you keep each month

Clients 10 Minutes per client 800 Your price per minute €0.30

You bill€2,400

We bill you€1,200

Your margin€1,200

Phone numbers not included. Example only, your prices are yours to set.

Questions

Straight answers.

Can my business use Stemvo directly, without an agency?

Yes. Sign up, build your agent from a template, connect a phone number and go live. If you would rather have it set up for you, a partner agency can do it.

What is a white-label voice AI platform?

It is the engine behind AI phone agents that an agency sells under its own name. Stemvo runs the calls, voices and language model; your clients only see your brand, your domain and your invoices.

Which languages can my agents speak?

The ten languages you can hear on this page: English, Dutch, German, French, Spanish, Italian, Polish, Bulgarian, Romanian and Swedish. Each one uses a voice built for that language, not an English voice reading a translation.

Where is call data processed and stored?

Inside the European Union. Speech recognition, the language model, the voice and storage all run in EU regions, and the sub-processor list names every company and region.

How much does Stemvo cost?

One price per minute with speech, language model, voice and platform included. Phone numbers are charged at cost. There is no monthly platform fee.

Can I move agents from Retell or Vapi?

Yes. Import an agent’s prompt, tools and settings, test it side by side, then point the phone number to Stemvo when you are happy.

How fast can a business go live?

Most businesses go live the same day: pick a template, describe your business, connect your calendar and forward your number.

Is there an API?

Yes. Everything in the dashboard is in the REST API, with webhooks for every call event and SIP trunking for your own carrier.

Will my clients see the Stemvo name?

No. The dashboard, login page, emails and invoices carry your name, logo, colours and domain.

Tap to hear Mila

Every call answered, in your caller’s language.

Build your first agent today. 60 free minutes, no card.

Build your agent White label for agencies