Private practice

Privacy policy

Effective 12 November 2026

Who we are

Mien is an iPhone app published by nooption (“we”, “us”). Contact us at [email protected].

Camera and face tracking

With your camera permission, Mien uses Apple’s ARKit face tracking to estimate facial movement. This drives the illustrated overlays in the live mirror and provides movement feedback during sessions and checks.

• Camera images and face-tracking information are processed on your iPhone in real time. They are not uploaded to us or a third-party service.
• Raw face-tracking geometry and expression coefficients are not saved. Check results and session summaries are saved as practice records on your device.
• Face-tracking information is not used to identify you, advertise to you or track you.

What is saved on your iPhone

• Movement-check results, session history, effective hold time, streaks and program progress.
• Your preferences, including app language, appearance, guidance and reminder settings.
• Photos you choose to keep or add. Automatic session photos are off by default. If you enable Session photo in Settings, Mien saves one photo from a session to its local photo records.

We cannot access these records. Your iPhone backup or a direct device transfer may include app data under Apple’s settings and terms. Mien does not provide its own cloud sync.

Photos, clips and sharing

You can take a photo or record a short silent clip in the mirror. Mien does not use your microphone. You choose whether to save or share a capture through iOS. Temporary clips are removed when their preview is closed.

If you export a file, it may be retained by the app or service you choose. Deleting an original in Mien does not remove copies you have exported.

Purchases and reminders

Mien Pro offers monthly and yearly subscriptions and a one-time lifetime purchase through Apple’s StoreKit. Apple handles payment. The app checks purchase entitlements to unlock features; we do not receive your payment details or Apple Account credentials.

If you enable a daily reminder, it is scheduled locally on your iPhone. Mien does not use a push-notification server.

Accounts, advertising and analytics

No account or sign-in is needed. The app does not include advertising, analytics or tracking SDKs. We do not sell your face data or practice records.

Deleting your records

In Mien’s Settings, use Delete all photos to remove saved photo records or Reset practice history to clear your practice records. These controls are available without Pro.

Deleting Mien removes its local app data. Exported files and device backups are managed separately. Deleting app data does not cancel an Apple subscription or erase purchase entitlements.

This website

This website does not use cookies, analytics or third-party scripts. The portrait-color preview runs locally in your browser and does not store your selection. The hosting provider may keep standard server logs, such as IP address and time of visit, for security and operation.

If you email us

We use your email address and message to reply and keep a record of the conversation. Please send only information needed to explain your question.

Children

Mien is not directed at children. We do not knowingly collect personal information from children through the app.

Changes and contact

We will update this page and its effective date when the policy changes. If a change affects how face data is handled, we will also explain it in the app before it takes effect.

Privacy questions: [email protected].