Bandwise
Ring sizer, fully offline
Only for iPhone
Free · In‑App Purchases · Designed for iPhone. Not verified for macOS.
iPhone
Bandwise is the calm, accurate way to find a ring size — and it works entirely on your device.
Two ways to measure:
• Match a ring — lay a ring you already own flat on the screen and size the on-screen circle to its inside edge.
• Measure a finger — wrap a paper strip around a finger and read its circumference on a true-to-scale ruler.
What makes Bandwise different:
• Accurate by design — calibrate once against any bank or ID card (a worldwide standard size) so on-screen millimetres are exact on your device.
• Truly offline — no accounts, no sign-in, no network, no tracking, no ads.
• Clean one-screen flow — your size updates live as you adjust.
• Every standard — see US, UK, EU/ISO and Japan sizes plus diameter and circumference in millimetres.
Bandwise Pro (a one-time unlock) adds the full international conversion chart, the finger ruler mode, and unlimited saved measurements for the people you shop for.
Always confirm with a jeweller before buying — Bandwise gives you a confident, well-calibrated estimate to start from.
Ratings & Reviews
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The developer, 永 张, indicated that the app’s privacy practices may include handling of data as described below. For more information, see the developer’s privacy policy .
Data Not Collected
The developer does not collect any data from this app.
Accessibility
The developer has not yet indicated which accessibility features this app supports. Learn More
Information
- Seller
- 永 张
- Size
- 628.7 KB
- Category
- Utilities
- Compatibility
Requires iOS 26.0 or later.
- iPhone
Requires iOS 26.0 or later. - Mac
Requires macOS 26.0 or later and a Mac with Apple M1 chip or later. - Apple Vision
Requires visionOS 26.0 or later.
- iPhone
- Languages
- English
- Age Rating
4+
- 4+
- In-App Purchases
Yes
- Bandwise Pro $4.99
- Copyright
- Copyright © 2026 Peter Zhang. All rights reserved.