# TrueRuler: Pocket Ruler — Measure in cm and inches

> Measure in cm and inches (iPhone/iPad app by 玥 熊.)

- Source: https://appshunter.io/ios/app/trueruler-pocket-ruler/id6810102379 (this page in markdown: same URL + `.md`)
- Developer: [玥 熊](https://appshunter.io/developer/6780204409)
- Category: Utilities
- Price: Free
- Age rating: 4+
- Requires: iOS 17.0 · 7 MB
- Languages: American English, Chinese (Simplified, China)
- Released: 2026-09-11
- Data updated: 2026-09-25
- User reviews in markdown: https://appshunter.io/ios/app/trueruler-pocket-ruler/id6810102379/reviews.md

## What is TrueRuler?

TrueRuler is a screen ruler with manual calibration, designed for checking and comparing the length of small objects that fit within your screen.

Move the green start guide and red end guide to see the distance between them. Switch between centimeters and inches, or change the ruler direction to suit the object you are measuring.

Features
• Centimeter scale with 1 mm divisions.
• Inch scale with 1/16-inch divisions.
• Two movable guides with a direct length readout.
• Lock the guides to avoid accidental movement, or reset their positions.
• Expand the ruler to full screen while keeping measurement controls within reach.
• Calibrate against a reference of known length.
• Save horizontal and vertical calibration separately.

Measuring requires no account or internet connection. Calibration settings stay on your device.

Before measuring
Check the scale against a physical ruler before first use, and calibrate each direction when needed. Start from the zero mark shown on the screen. Actual accuracy depends on the device, display settings, and calibration. Decimal places in the readout do not indicate certified measurement accuracy.

For iPhone and iPad. Supports device rotation and horizontal or vertical ruler layouts.


## Version history (last 1 release)

### 1.0.0 — 2026-09-11

No release notes.

## More apps by 玥 熊

- [Sayee](https://appshunter.io/ios/app/sayee/id6780341993)
- [LiDARMeasure](https://appshunter.io/ios/app/lidarmeasure/id6780486220)
- [AeroMesh](https://appshunter.io/ios/app/aeromesh/id6780911423)

All apps by 玥 熊: https://appshunter.io/developer/6780204409

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*Data collected daily from the US App Store and indexed by [AppsHunter](https://appshunter.io/). User reviews are verbatim App Store reviews. Ratings, prices and chart positions refresh continuously; this snapshot is from 2026-09-25.*