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From your expertise to a scalable AI coach

Turn your coaching methodology into AI practice scenarios. Build them in minutes, deploy to hundreds of students, and let them practice whenever they need to.

Trainer reviewing AI voice coaching conversations at a standing desk in a modern office

Four steps to your AI voice coach

Documents flowing into the twinvoice platform, showing feedback model, sales technique, and conversation guide being uploaded to the knowledge base
Upload your knowledge
Add your methodology documents, exercises, or scripts. Our AI reads your content and understands how you coach.
The twinvoice coach builder interface surrounded by configuration options for voice, personality, language, and coaching style
Build your coach
Give your coach a name, personality, and coaching style. Write a system prompt or let AI generate one from your uploaded content.
Voice cloning interface showing audio waveforms being processed to create an AI voice that sounds like the trainer
Choose your voice
Pick from professional stock voices in 29+ languages. Want something more personal? Upload 1 to 3 minutes of audio and Twinvoice creates a voice that sounds like you.
Invite code creation form with student avatars, showing how trainers share access to their coaching programme
Invite your students
Create a program, generate invite codes, and share them with your students. They log in, pick a scenario, and start practising immediately.

Everything you need to build and scale

One platform for creating, deploying, and managing AI voice coaches. No developers needed.

Coach builder
Create AI voice coaches with custom system prompts, dynamic variables, and configurable personas. No coding required.
Voice cloning
Upload a short audio sample and get an AI voice that sounds like you. Powered by ElevenLabs instant voice cloning.
Knowledge base
Upload methodology documents, exercises, and scripts. Your coach references them during conversations to stay on brand.
Multi-language support
Build coaches that work in Dutch, English, German, French, or Spanish. Switch languages per session, not per coach.
Analytics and transcripts
Track student usage, review conversation transcripts (optional), and monitor engagement across your entire coaching programme.
Invite codes
Generate partner-specific invite codes, control who can access each program, and allocate minutes per student or team.

Your data stays where it belongs

GDPR compliant
Built for European data protection standards from day one. Full compliance with GDPR requirements.
1-day voice retention
Voice conversations are processed through ElevenLabs with a 1-day retention policy. Transcripts are then stored exclusively on our EU servers.
EU hosted and operated
100%
EU data hosting
All data stored on EU servers in Paris, France. Your coaching content and student data never leave the EU.
Row-level security
Every database query is scoped to the authenticated user. Trainers only see their own coaches, students only see their own programs

Trainers building with twinvoice

"My sales students were terrified of cold calling. Now they practice with AI prospects until they're confident. I can hear the difference in their real calls within a week."
Lana van Mourik
Founder
"We built an AI coach that teaches the 4G feedback method in my voice. Our clients now practise difficult conversations whenever they need to, not just in workshops. It's transformed how we deliver training."
Peter Straatsma
Founder
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Everything you need to know

Get clear answers to the questions we hear most so you can focus on what truly matters.

Do I need technical skills to create an AI voice coach?

No. Twinvoice is designed for trainers and coaches, not developers. You write your coaching instructions in plain language, upload your methodology documents, and choose a voice. The platform handles the technical side. Most trainers build and test their first coach within 30 minutes.

How does voice cloning work?

You upload 1 to 3 minutes of clear audio of your voice. Twinvoice uses ElevenLabs instant voice cloning to create a digital version that sounds like you. The cloned voice is private, remains your property, and can be deleted at any time. You can also skip cloning and choose from professional stock voices in 29+ languages.

What types of coaching can I build?

Twinvoice supports four coach types: roleplay (the AI plays a character like a prospect or interviewer), coaching (the AI guides users through exercises or reflection), hybrid (roleplay followed by coaching feedback), and Q&A (answers based on uploaded documents). This covers applications from sales training and leadership development to interview preparation and mental health support.

How do students access the AI coach?

You create a program, generate invite codes, and share them with your students. They register with the code, log in, pick a scenario, and start practising immediately. Students need a device with a microphone and internet connection. No app download required.

What languages does twinvoice support?

Twinvoice supports Dutch, English, German, French, and Spanish. You set the language per session, not per coach, so one coach can work with students in multiple languages.