Ring Sizer vs Caliper
Price, ratings, monetisation and update history for both apps, side by side โ with what reviewers say about each.
Ring Sizer
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Ring Sizer is a simple on-screen tool to find your ring size at home. Place a ring on the screen and resize the guide until it matches the inner edge, or measure your finger with the stencil and side slider. Ring Sizer also includes a real centimetre and inch ruler. Get clear US, UK, and EU sizes, save measurements on your device, and calibrate with a bank card for better accuracy. This app uses the standard Apple Terms of Use (EULA): https://www.apple.com/legal/internet-services/itunes/dev/stdeula/
Caliper
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Caliper is a pocket precision toolbox โ the measuring tools you reach for around the house, in one clean app. FOUR INSTRUMENTS โข Bubble Level โ 1-axis and surface. A real glycerin vial that turns true at 0.0ยฐ. โข Ruler โ an on-screen scale in mm, cm, or inches. โข Angle Finder โ a protractor and a tilt clinometer, with roof pitch and grade. โข Sound โ a quick decibel check of the room. GUIDED JOBS Do not just read a number โ get the job done. Hang a Picture, Level a Shelf, Roof Pitch, Level Furniture: each walks you through it and saves the result. A MEASUREMENT LOG Keep every reading and group them into projects โ the kitchen shelf, the living-room frames. PRECISION Calibrate the level and ruler with a fine tilt offset, and feel a firm haptic tick the moment a reading is true. HONEST BY DESIGN No ads. No tracking. No accounts. Everything is measured on your device and stays there โ Caliper collects no data. The four instruments are free, and the log keeps your most recent 25 readings. Caliper Pro unlocks every guided Job, the unlimited log with projects, and precision calibration. Note: readings depend on your device sensors and are intended for everyday use, not certified measurement. Caliper Pro is an auto-renewing subscription, offered monthly or yearly with a 7-day free trial. Payment is charged to your Apple Account at confirmation of purchase. It renews automatically unless cancelled at least 24 hours before the current period ends; manage or cancel in Settings > Apple Account > Subscriptions. Terms of Use: https://theknack2020-sketch.github.io/caliper/terms-of-use.html Privacy Policy: https://theknack2020-sketch.github.io/caliper/privacy-policy.html
Screenshots
Verdict
The clearest difference is iOS requirement: Ring Sizer at 15.1 against Caliper's 17.0. On price, update cadence, ads and in-app purchases there is nothing between them.
Scored on Price ยท Rating ยท Positive reviews ยท Number of ratings ยท Update frequency ยท Ads ยท In-app purchases ยท Monetization ยท Best chart rank ยท Devices ยท Requires iOS
Both are free to download. Neither carries in-app purchases, so what you see is what you pay.
Ring Sizer ships an update every 2 weeks, Caliper every 6 days. The most recent releases landed on October 25, 2026 and November 2, 2026 respectively.
| Parameter | Ring Sizer | Caliper |
|---|---|---|
| Price | Free | Free |
| Update frequency | Every 2 weeks | Every 6 days โ better |
| Ads | No | No |
| In-app purchases | No | No |
| Devices | iPhone, iPod โ better | iPhone |
| Requires iOS | 15.1 โ better | 17.0 |
| Further details โ not scored | ||
| Size | 49 MB | 2 MB |
| Age rating | 4+ | 4+ |
| Developer | Yaroslav Trofimov | UFUK OZDEMIR |
In-app purchases
Ring Sizer
No in-app purchases
Caliper
No in-app purchases









