BandwiseRing sizer, fully offline

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.
• Convert and share — dial in a size you know to read it in every other standard, then share it; measuring a finger adds wide-band fit advice.

Bandwise Pro (a one-time in-app purchase) adds the full international conversion chart, UK and JP converter results, 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.

PRICING Download Bandwise and start measuring right away: match a ring, calibrate, see US and EU/ISO sizes, and keep one saved measurement. Bandwise Pro is a one-time in-app purchase that unlocks the full conversion chart, UK and JP results in the size converter, the finger ruler, and unlimited saved measurements — no subscription.

FEEDBACK Questions or feature requests? Email obeliskclubclub@gmail.com — we usually reply within two business days. If Bandwise helps you find the right size, a review on the App Store helps a lot.