DIAMETRO vs Ring Sizer

Find your ring size in seconds, right on your iPhone. Place a ring you already own on the calibrated circle, slide until the bubble fills the inside of the ring, and DIAMETRO shows its size in EU/ISO, US, UK, CH and JP, plus the exact diameter and circumference. HOW IT WORKS • Calibrate once with a bank card or a coin for true physical scale • Lay your ring on the screen • Slide until it fits, then save the result DIAMETRO PRO • Finger measurement: enter the circumference of your finger and get a recommended size, with optional knuckle compensation • All accent colors • Unlimited saved measurements • Printable PDF sizer, export and backup (PDF, CSV, JSON) ALSO INSIDE • Light and Dark mode • English, Romanian and French PRIVATE BY DESIGN No account. No tracking. Your measurements stay on your device. Conversions are approximate. Confirm your size with a jeweler before buying.

Estimate your ring size with your iPhone camera and a standard-sized card. Measure an existing ring or a finger, check the detected edges, and compare sizes across international charts. MEASURE WITH A PHOTO Place a ring on or beside an 85.60 × 53.98 mm card on a flat surface. For fingers, place the card above a relaxed, spread-out hand. Use the level guide, take a photo, or choose an existing picture. The app uses the card as a scale reference and corrects perspective in the card’s plane. CHECK THE FIT Review the card corners and ring’s inner edge with a magnifying view. Move the ring circle’s center or radius to refine the result. For fingers, slide the measurement along the detected finger to check a wider section or knuckle. CONVERT RING SIZES Compare 15 sizing systems, including US/Canada, UK/Australia, European circumference, Japan, Hong Kong, mainland China, Taiwan, India, Brazil, South Korea, Argentina and Chile. Choose your country, preferred size system, and millimeters or inches. Published charts vary, so check your jeweler’s chart before ordering. KEEP YOUR MEASUREMENTS Save results, photos and adjustments in History. Reopen a measurement to review it, add a note, or compare sizes. Your measurement folders are also available in the Files app. Delete one measurement or clear them all in Settings. ON-DEVICE PROCESSING Measurement photos are processed on your iPhone. No account, advertising or tracking is required. The app does not upload measurement photos to a server. iOS backups and files you choose to share are controlled by you. BEFORE YOU ORDER Results are estimates, not a guaranteed fit. Lighting, camera angle, object height and card placement can affect accuracy. Finger circumference is estimated from visible width; fingers are not perfect circles. Scan a few times and confirm with a physical ring sizer or jeweler before purchasing. Terms of Use: https://www.x-tech.io/apps/ringsizer/terms Privacy Policy: https://www.x-tech.io/apps/ringsizer/privacy