Knuckle vs Tape Measure

Knuckle turns your screen into a ring sizer. Lay a ring you already own flat on the display, match the gold circle to the inside of the band, and read the size. That is the whole thing. No camera, no printing, no paper strips to cut out, no trip to a jeweler. Before the first measurement you line a bank or ID card up against an outline, once, so Knuckle learns exactly how large a millimetre is on your particular screen. Every reading after that is true to your device. You get the inner diameter in millimetres next to the sizes people actually ask for - US, UK, EU, Japan, Australia, Hong Kong and Italy. Each result carries an honest confidence band instead of one number pretending to be certain. Sizes are worth keeping. Save one under the person it belongs to, note the finger and the hand, and look it up later while you are standing in the shop. Send a clean size card to whoever is buying. Nothing leaves your device. No account, no sign in, and it all works with the network switched off. Privacy Policy: https://docs.google.com/document/d/e/2PACX-1vTDX9pxPOlUJl_skVUHPi99mAw0y2B2BYd_v1mJkoF3xW3rlOcW5KlYd4t93MMbbGhctSTnBTy7d_l6/pub Terms of Use (EULA): https://www.apple.com/legal/internet-services/itunes/dev/stdeula/

Measure anything with your camera. Point, tap, done — your iPhone becomes an AR measuring tool. MEASURE DISTANCES Tap two points to measure. Chain points to measure like a real tape. LIVE TAPE MODE Drop a point and pull — the distance updates live as you move, with haptic ticks. AREA & PERIMETER Tap the corners of a floor, wall or table to get area and perimeter instantly. RING SIZER Find your ring size at home. Calibrate once with a bank card and match any ring on screen. SAVED HISTORY Every measurement is saved automatically. Rename, review and share whenever you need. UNITS Switch between metric (m, cm, mm) and imperial (ft, in) with one tap. SNAPSHOT & SHARE Capture your measurement with overlays and share it. Note: AR measurements are approximate (±1–2 cm) and are not a substitute for professional tools. Premium unlocks unlimited history, area measurement and the ring sizer. Payment is charged to your Apple ID account. Subscriptions renew automatically unless cancelled at least 24 hours before the end of the current period. Terms of Use (EULA): This app uses Apple's standard EULA: https://www.apple.com/legal/internet-services/itunes/dev/stdeula/ Privacy Policy: https://docs.google.com/document/d/1VTP4tpVMS5_EEFfYYFawgPgpUz2D17wce9fEVa_SVEY/edit?usp=sharing