⌚ Wrist Size

Measure your wrist circumference in 3D with the Face ID camera — for watch strap sizing.

Install Wrist Size (v1.1)

Open this page in Safari on an iPhone with Face ID. Development-signed: installs only on registered devices. After installing, trust the developer profile in Settings → General → VPN & Device Management.

How a scan works

~25 cm
  1. Put the iPhone flat on a table, screen up.
  2. Make a closed fist and hold it ~25 cm above the camera.
  3. Follow the voice guidance: 7 poses, from palm-up through a three-quarter turn. Keep the fist frozen; rotate the whole arm.
  4. The app stitches the 7 depth views into a 3D model and measures the wrist — all on the phone, nothing uploaded.
0° palm up45° 90° sideways135° 180° palm down225° 270°

What you get

Wrist circumference in mm/cm/inches, wrist width and thickness, a cross-section view, an interactive 3D scan, and strap-size suggestions (Apple Watch bands, Solo Loop, classic straps). Typical accuracy is a few millimeters — strap sizes step in ~10 mm, so that's comfortably within range.

Requires an iPhone with Face ID (TrueDepth). Everything runs on-device.