246+ iOS apps curated and reviewed
If you already know Ruler, this is the deeper bench. 246+ mm ruler free apps for iPhone, all reviewed and ranked by user rating, recency, and download trend as of August 2026.
| # | App | Price | Rating | Ads | In-App Purchases | Updated |
|---|---|---|---|---|---|---|
| 1 |  | Free | 3.5★ (79) | Yes | Yes | Aug 2026 |
| 2 |  | Free | 3.9★ (205) | No | No | May 2026 |
| 3 |  | Free | 3.6★ (23) | Yes | Yes | Aug 2026 |
| 4 |  | Free | 4.3★ (35K) | No | Yes | Aug 2026 |
| 5 |  | Free | 4.5★ (1K) | Yes | Yes | Aug 2026 |
| 6 |  | Free | — | Yes | No | May 2026 |
| 7 |  | Free was $0.99 | — | No | No | Aug 2026 |
| 8 |  | Free | — | No | No | May 2026 |
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.
This app provides a precise on-screen measuring tool for your iPhone or iPad. Easily measure length and width in centimeters, millimeters, or inches, with options to save measurements as photos and customize the ruler's appearance. It's designed for accurate, user-friendly measurements.
Turn your iPhone or iPad into a precise measuring tool. Easily measure lengths in centimeters or inches with features like magnifier mode and haptic feedback. Ideal for daily tasks, office use, DIY projects, and on-the-go measurements.
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.
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.
Measure objects and distances with an on-screen ruler and augmented reality. Supports inches and centimeters, with features for linear sizes, angles, area, volume, and more. Save your measurements for later use.
Transform your device into a precise measuring tool. Measure objects, distances, and spaces with fingertip accuracy. Offers real-time results in both metric and imperial units, with professional calibration for your specific device.
This app functions as a digital measuring tool, allowing you to measure objects and distances with accuracy. It also enables you to create sketches with text annotations and share your measurements and designs.
Measure objects directly on your smartphone screen without needing traditional tools. This utility offers an easy-to-use interface with accurate scales in centimeters and inches, supporting both horizontal and vertical measurements.
Measure objects using your phone's camera with augmented reality. This utility app provides accurate measurements in various units and allows you to save and share your results.