Get a screen-calibrated ring size in under a minute. Use it instantly in your browser right now, or grab the app for offline access and a home-screen shortcut.
Not ready to wait? Use the instant web app now →
Our web app already behaves like a native app — full screen, offline-friendly caching, and an icon on your home screen — without an app store review wait or storage download. Here's how to install it on each platform:
We looked at what's already out there before deciding how to build this. Most ring sizer apps on the store today ask for storage space, sometimes camera or account permissions, and vary a lot in review quality. Here's the honest comparison:
| Rings Sizes Web App | Typical Store Download | |
|---|---|---|
| Install required | No — works instantly | Yes, plus app store review wait |
| Storage used | 0 MB | Often 20–80 MB |
| Works on iPhone & Android | Same app, both platforms | Usually separate apps, separate reviews |
| Always up to date | Yes, automatically | Depends on user updating |
| Account or permissions required | None | Varies — some request camera/account access |
| Ads | None on the tool itself | Varies by app |
General comparison based on publicly listed feature sets and permissions of ring sizing apps as of 2026; individual apps vary.
Calibrates to your exact device using a ruler you hold up to it — not a fixed image.
Match a digital circle to a ring's inner edge for an instant reading.
No ring on hand? Size directly from your finger circumference.
US, UK, EU, Japan, and Australia sizes shown together, instantly.
No sign-up, no email gate — open it and start measuring.
No premium tier, no paywall, no in-app purchases.
Native apps for Google Play, the Apple App Store, and Galaxy Store are in progress. In the meantime, our web app offers the same calculator and can be added to your home screen for an app-like experience — see the install steps above.
Yes, completely free with no account, no premium tier, and no in-app purchases — on the web app today, and it will remain free once native apps launch.
Once loaded, core calculator functionality is cached in your browser for the session. For guaranteed full offline use, the native apps (once available) will be the better option.
The underlying math is identical — both rely on screen calibration against a physical reference. Accuracy depends far more on how carefully you calibrate and measure than on which platform you use. See our methodology page for the full technical explanation.
Yes, Galaxy Store support is planned alongside Google Play and the Apple App Store. Use the notify button above to be told as soon as any platform goes live.
Native apps aren't live yet — leave your email and we'll let you know the moment this store's app is available. In the meantime, the web app works instantly, no waiting required.