Smile coach for iOS & Android

Train the smile that reaches your eyes

Duchenne is a pocket smile coach. On-device AI reads your eye crinkle, mouth lift, and symmetry, then coaches you to a genuine smile in five-second sessions.

Get it on iPhone Get it on Android

Free to start. No account. Your camera never leaves your phone.

Duchenne mascot, a fluffy orange creature, waving hello

Smile Score 92

Streak 7 days

Eye crinkle detected

Three steps. Five seconds at a time.

Open the app, smile, and let the coach do the rest. Here is the whole loop.

Point the camera

Look at the front camera and you are training. No account, no calibration maze, and every frame is processed on the phone itself.
Get coached live

The AI scores your eye crinkle, mouth lift, and symmetry each second, and nudges you while you hold the smile, not after.
Keep the streak alive

Daily challenges, 30+ achievements, and event countdowns turn a quick rep into a habit your photos will thank you for.

Duchenne app Quick Train screen with the mascot wearing a training headband

Duchenne app home screen showing smile score, streak card and training activity heatmap

The one smile you can't fake

Anyone can lift the corners of their mouth. A genuine Duchenne smile also fires the orbicularis oculi, the ring of muscle that crinkles your eyes. People spot the difference in about 50 milliseconds, which is why forced photo smiles feel off.

The app watches three signals from your front camera and scores authenticity from 0 to 100, live.

Eye crinkleorbicularis oculi
Mouth liftzygomatic major
Symmetryleft-right balance

92 Smile Score

Built like a coach, not a filter

Everything in the app exists to make your real smile better, on either platform.

Event Prep Mode

Wedding in June? Interview on Friday? Set the date and get a focused 7-day training window with a countdown that keeps you honest.

Tom's wedding · 7 days to go

Streaks & achievements

A heatmap for your face. Show up daily, watch it warm up, and unlock 30+ badges.

On-device privacy

Every frame is analysed on your phone. No uploads, no cloud, no exceptions.

Real-time coaching

Feedback lands while you are still smiling. Hold, adjust, and feel the score move with you.

Smile gallery

Save your best takes and watch the progression from week one to wedding day.

Quick facts about Duchenne

The short version — in case you're skimming.

What is Duchenne?: Duchenne is a smile-training mobile app for iOS and Android that uses on-device AI to coach the genuine Duchenne smile in real time.
Who built it?: Built by DS Development. Released on Google Play in 2025; iOS launched on the App Store in May 2026.
How does it work?: The app analyses three signals from the front camera — eye crinkle (orbicularis oculi), mouth lift (zygomatic major), and left-right symmetry — and scores authenticity 0–100 in real time. All processing runs locally; no images leave the device.
What does it cost?: Free tier with 2 sessions per day. Premium: $4.99/month, $29.99/year, or $49.99 lifetime.
Who is it for?: People preparing for weddings, job interviews, professional headshots, dating-profile photos, or anyone with camera anxiety.

From the blog

Science, technique, and prep guides for genuine smiles.

Pillar What is a smile coach? The category-defining guide to AI-powered smile training. Science The science behind a genuine Duchenne smile Why fake smiles get spotted in 50 milliseconds. How to How to smile naturally: 7 techniques that work Facial-muscle exercises you can start today.

Duchenne mascot celebrating with arms raised

Ready to train your smile?

Pick your platform and run your first five-second session tonight.