SizeStamp

Stop repeating measurements and second-guessing size charts. SizeStamp keeps reusable ring, foot, wrist and head measurements on your device, compares merchant dimensions against the allowance you choose, and exports a clear dated record. Calibrate the display with the 53.98 mm short edge of a standard bank or identity card, then match a ring's true inner edge to the on-screen guide. Enter foot length and width, wrist circumference, or head circumference from your own ruler or flexible tape. Before buying, enter the merchant's stated dimension and an acceptable allowance. SizeStamp shows whether it is below, within or above your selected range. The result is transparent arithmetic, not a fit guarantee. Keep useful results: • Dated PDF report • Compact PNG summary • CSV measurement and purchase-check data • Separate local profiles Private by design: • No account or sign-in • No camera, photo, contacts, location or health permissions • No backend, analytics, ads or tracking • No cloud sync or third-party SDK • Exports leave the device only when you choose a destination in the iOS share sheet Regional ring and footwear labels are reference estimates. Materials, shape, manufacturing tolerances, temperature and personal comfort can change fit. Always compare the saved millimeter measurement with the merchant's current chart before ordering. SizeStamp is a US$3.99 paid App Store download. Every feature is included. There are no subscriptions, in-app purchases, paywalls or external checkout.