# Ruler App — Measure the scale

> Digital ruler app for iPhone and Apple Watch with metric and imperial units. (iPhone/iPad app by Piet Jonas.)

- Source: https://appshunter.io/ios/app/ruler-app/id303731879 (this page in markdown: same URL + `.md`)
- Developer: [Piet Jonas](https://appshunter.io/developer/288060167)
- Category: Utilities, Reference
- Price: $0.99
- Rating: 2.60/5 from 5 App Store ratings · 2 written reviews indexed
- Age rating: 4+
- Requires: iOS 12.0 · 2 MB
- Languages: American English
- Released: 2009-02-03
- Data updated: 2026-08-15
- Monetization: paid
- User reviews in markdown: https://appshunter.io/ios/app/ruler-app/id303731879/reviews.md

## What is Ruler App?

Turn your iPhone or Apple Watch into a ruler and measure the scale of any small thing.

Features:
- switch between imperial and metric scales
- adjust the height of the ruler for direct comparison
- different color schemes
- switchable ruler scales

Apple Watch App:
- switch between imperial and metric scales
- switchable ruler scales

## Key features

- Imperial and metric scale switching
- Adjustable ruler height
- Color scheme customization
- Apple Watch compatibility
- Switchable ruler scales

## Recent user reviews (2 of 2)

All indexed reviews: https://appshunter.io/ios/app/ruler-app/id303731879/reviews.md

### 1/5 — Deeply defective.

*2018-07-07*

3.5 inches measured as 4 inches. Worse than worthless, untrustworthy in my opinion.

### 1/5 — Poor

*2009-03-25*

Claims to measure to scale but won't go bigger that 6.7 metres. Pretty usless really. Don't download it.

## Frequently asked questions about Ruler App

### What devices does Ruler App support?

Ruler App is compatible with iPhone, iPod, and Apple Watch devices. It allows you to turn your iPhone or Apple Watch into a functional ruler for various measurement needs.

### How accurate is Ruler App?

The accuracy of Ruler App depends on the device's sensors and calibration. Users have reported a rating of 2.6 stars from 5 ratings, suggesting mixed experiences with precision.

### Can I switch between measurement units in Ruler App?

Yes, Ruler App allows you to easily switch between imperial and metric scales on both your iPhone and Apple Watch. This feature enhances its versatility for different user preferences.

### What is the price of Ruler App?

Ruler App is a paid application, available for $0.99. This one-time purchase grants you access to its measurement features across supported Apple devices.

### How often is Ruler App updated?

The latest version of Ruler App is 1.4.1, last updated on January 13, 2025. This indicates a recent update, suggesting ongoing development and maintenance by the developer.

### Does Ruler App have ads?

No, Ruler App does not contain advertisements. As a paid application, it offers an ad-free experience for users.

### What is the age rating for Ruler App?

Ruler App has an age rating of 4+. This indicates it is suitable for children and adults, with no mature content.

### What are the main features of Ruler App?

Key features include switching between imperial and metric scales, adjusting ruler height for direct comparison, and customizable color schemes. The Apple Watch app also supports scale switching.

## Version history (last 5 releases)

### 1.4.1 — 2025-01-13

- bug fixes

### 1.4.0 — 2017-09-27

This app has been updated by Apple to display the Apple Watch app icon.

- support for iOS11 and iPhone X

### 1.3.0 — 2015-09-25

- Apple Watch support

### 1.2.1 — 2014-10-08

- support for iPhone 6 and 6+
- enhanced for iOS 8

### 1.1.3 — 2014-05-21

- bug fixed

## Apps similar to Ruler App

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| --- | --- | --- | --- |
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| [Sound Meter - Decibel dB](https://appshunter.io/ios/app/sound-meter-decibel-db/id6756865763) | — | Free | Utilities |
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## More apps by Piet Jonas

- [Game Counter](https://appshunter.io/ios/app/game-counter/id288060164)
- [Workout](https://appshunter.io/ios/app/workout/id288240647)
- [Compass](https://appshunter.io/ios/app/compass/id288420566)
- [Contact Find](https://appshunter.io/ios/app/contact-find/id290153951)
- [Thesaurus App](https://appshunter.io/ios/app/thesaurus-app/id291362860)
- [Baseball Games](https://appshunter.io/ios/app/baseball-games/id291533429)

All apps by Piet Jonas: https://appshunter.io/developer/288060167

## Related topics

[ruler app](https://appshunter.io/ios/topics/ruler-app)

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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 2026-08-15.*