This utility app provides a portable ruler for on-the-go measurements. It also includes a suite of additional tools like a protractor, spirit level, and various meters for diverse measurement needs.






250+ iOS apps curated and reviewed
The best free metric ruler apps on iPhone average 4.2★ across 250+ titles — we've ranked them by what real users actually keep on their phones. Updated October 2026.
| # | App | Price | Rating | Ads | In-App Purchases | Updated | |
|---|---|---|---|---|---|---|---|
| 1 | Free | 4.4★ (1.1K) | Yes | Yes | Nov 2026 | ||
| 2 | Free | 4.3★ (35K) | No | Yes | Nov 2026 | ||
| 3 | Free | 3.5★ (79) | Yes | No | Nov 2026 | ||
| 4 | Free | 4.4★ (90K) | No | Yes | Nov 2026 | ||
| 5 | Free | — | No | Yes | Sep 2026 | ||
| 6 | Free | 5.0★ (2) | Yes | Yes | Oct 2026 | ||
| 7 | Free | — | No | No | May 2026 | ||
| 8 | Free | — | No | No | Oct 2026 |






This utility app provides a portable ruler for on-the-go measurements. It also includes a suite of additional tools like a protractor, spirit level, and various meters for diverse measurement needs.




This app provides a versatile toolkit for all your measurement needs. It includes a classic ruler, a tape measure, and a camera ruler for precise measurements. Easily switch between units and document your findings by adding measurements directly to photos.



Measure lengths, widths, and diagonals accurately using your phone. Switch between metric and imperial units, and utilize flexible starting points for precise measurements in any direction. Features auto-calibration for minimal error and a screen lock to preserve readings.