Reusable size records for more confident purchases.
Save ring, foot, wrist and head measurements once, compare merchant dimensions with your chosen allowance, and export a dated result without creating an account.
Calibrated ring guide
Match a standard card's 53.98 mm short edge, then align the ring's true inner edge with an on-screen circle.
Reusable body-item dimensions
Record foot length and width, wrist circumference and head circumference from your own ruler or flexible tape.
Transparent purchase check
Enter the merchant's stated dimension and your acceptable allowance. SizeStamp shows below, within or above the selected range.
Portable results
Create a dated PDF report, compact PNG summary or CSV data file whenever you need a durable record.
How it works
Create a local profile. Calibrate the display for ring measurement or enter a manual measurement. Save the millimeter value. Compare it with the merchant's current chart or stated dimension. Export the result.
Private by design
No account, backend, analytics, advertising, tracking, cloud sync or third-party SDK. SizeStamp requests no camera, photo, contact, location or health permission.
Measurement limits
SizeStamp compares dimensions; it cannot account for material stretch, shape, manufacturing tolerance, temperature, swelling or personal comfort, and it never guarantees fit. Regional labels are reference estimates. Check the merchant's current chart before ordering.
Method references
The on-screen ring workflow uses millimeter diameter and circumference relationships described by ISO 8653. The GIA ring-size chart is a practical cross-check for common US and UK labels. Merchant charts remain authoritative for a purchase.
Pricing
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.