Support

Any iPhone with Face ID, running iOS 17 or later. Scanning uses the TrueDepth camera, so iPhones with Touch ID (such as iPhone SE) can open the app and view the sample report, but can't scan.

• Hold the phone at eye level, about 30 cm (a forearm's length) from your face.
• Use even, soft lighting and avoid strong light from one side.
• Keep hair off your forehead and take off glasses.
• Relax your face, with a neutral expression and teeth lightly together.
• When asked, circle your head slowly, like setting up Face ID.

Depth noise grows quickly with distance. Hold the phone a little closer (about 30 cm), keep it steady, and complete the full head circle slowly, then scan again.

The report shows a noise floor, the level of difference the sensor can't tell apart from noise. Differences below it aren't meaningful. Cleaning the front camera area and avoiding direct sunlight also helps.

The app shows how consistent the measurement was across frames (the measurement spread). Treat it as an estimate: check it against an optician's measurement before ordering prescription lenses.

Distance PD (looking into the distance) is the number most glasses retailers ask for. Near PD is measured while you look at your phone, and is useful for reading glasses.

Only on your iPhone. Camera images are used during the scan to find facial landmarks and are not saved. Scans, depth data, 3D models and measurements are never uploaded and are never shared with the advertising SDK. They may be included in your own iCloud or computer backups. See the privacy policy.

• One scan: on the home screen, touch and hold the scan, then choose Delete scan.
• Everything: delete the app (touch and hold the Symmetry icon, then Remove App › Delete App). This removes all scans from your iPhone.
• Exports you saved or shared (PDFs, images, 3D models, videos) live wherever you put them, such as Photos or Files, and need to be deleted there.

Share cards (PNG), a full PDF report, 3D models (USDZ for AR Quick Look, PLY for Blender and MeshLab, STL for 3D printing) and a timelapse video (MP4) of your scans.

Exports are created on your iPhone and go only where you send them with the iOS share sheet. We never receive a copy.

Symmetry is free and shows ads from Google AdMob. Ads never have access to your face data.

• Tracking: go to Settings › Privacy & Security › Tracking and turn Symmetry off (or turn off Allow Apps to Request to Track).
• Ad consent (EEA, UK, Switzerland): you are asked on first launch. To change your choice at any time, tap Privacy choices at the bottom of the app’s home screen. Choosing “Ask App Not to Track” above also stops your advertising identifier being shared, whatever you chose.
• Apple ad personalisation: Settings › Privacy & Security › Apple Advertising.