# Ruler 2.0 - inch, mm, cm — High measurement accuracy

> Accurate on-screen ruler for measuring length and width in various units. (iPhone/iPad app by Oleg Osipov.)

- Source: https://appshunter.io/ios/app/ruler-20-inch-mm-cm/id1345983397 (this page in markdown: same URL + `.md`)
- Developer: [Oleg Osipov](https://appshunter.io/developer/1345983395)
- Category: Utilities, Education
- Price: Free
- Rating: 3.90/5 from 205 App Store ratings · 71 written reviews indexed
- Age rating: 4+
- Requires: iOS 12.0 · 15 MB
- Languages: American English, Russian
- Released: 2018-02-13
- Data updated: 2026-06-11
- Monetization: free
- User reviews in markdown: https://appshunter.io/ios/app/ruler-20-inch-mm-cm/id1345983397/reviews.md

## What is Ruler 2.0?

Ruler 2.0 - ruler app for high measurement accuracy on the iPhone and iPad. Accurate, exact, precise, precision, correct, true, easy to use and free - these are the words that can describe this ruler app the best way.

  - Save the measurement as a photo
  - 3 colors of the ruler for your comfort
  - Centimeters, millimeters or inches
  - Measure the length only or width and length at the same time

Tap on the measurement result to change it manually.
Pan with two fingers anywhere on the screen for even higher accuracy.

Measure every length and width with precision on-screen Ruler 2.0. Choose your preferred units of measurement - inches (inch), centimeters (cm) or millimeters (mm). Metric and Imperial systems are supported. Use on-screen ruler as you wish. Tap "Save" button to save the result to the Camera Roll of your device.

## Key features

- On-screen ruler
- Measure length and width
- Centimeters, millimeters, inches
- Save measurements as photos
- 3 ruler color options
- Manual measurement adjustment

## What do users think of Ruler 2.0?

Overall sentiment: negative

**Pros**

- 👍 Simple and easy to use
- 💡 Precise measurements (when working)
- ✨ Free with no ads
- ✅ Lightweight and small size
- 🎯 Good for small item measurements

**Cons**

- 🐛 Frequent crashes
- 📏 Inaccurate measurements on newer phones
- 📱 Not optimized for high DPI screens
- 📉 Scale is off by ~50% on newer models
- ⚠️ Support link is shady

**Commonly reported bugs**

- Crashes after a few seconds
- Keeps crashing
- Wrong scale/dimension measurement on newer iPhones (13, 14, 15 series, SE 2022)
- Inches are too small (e.g., 1cm shows as smaller than 4mm)
- Measurements are off by about half
- Screen scale wrong (1cm showing smaller than 4mm)
- Grid is shrunk on newer iPhones
- App frequently corrects '20' to '2.0'

**Most requested features**

- Update for newer iPhone displays (high DPI)
- Manual adjustment for screen size/resolution
- Add option to manually enter dimensions
- Add inch fractions as measurement option
- Allow adjustable text font size when saving
- Implement lighter background option (plain white)
- Make the measuring line not reset based on finger position

## Recent user reviews (10 of 71)

All indexed reviews: https://appshunter.io/ios/app/ruler-20-inch-mm-cm/id1345983397/reviews.md

### 1/5 — Shame

*2025-06-06, version 2.0.7*

Crashes after a few seconds 🫤

### 2/5 — Sizing is off for newer, larger phones (high dpi)

*2025-05-18, version 2.0.7*

This app was a very good app, but it’s completely unusable now if you’ve got a large max phone, I think it’s the high dpi screen that makes the inches way too small. The inches are about the size of a centimeter in this app. It needs to be updated to support high DPI large phones

### 1/5 — wrong scale in iphone16

*2025-04-13, version 2.0.7*

hi
wrong dimension measurement on iphone16
please solve

### 1/5 — Keeps crashing

*2025-01-11, version 2.0.7*

Would be just what I want if it stayed open long enough to see. 
Pity. Been like this for ages so no use whatsoever

### 1/5 — Screen scale wrong

*2024-10-17, version 2.0.7*

Needs updating for newer iPhone displays as 1cm is showing smaller that 4mm.

### 1/5 — Maybe it used to work, but it seems out of date.

*2024-10-09, version 2.0.7*

It’s not accurate, by about half of whatever unit of measurement your trying to check. Can’t find anywhere in the settings to adjust for screen size or anything. 

When I tapped the “support” button here in the App Store, it took me to a shady link: apple security said it was someone imitating a legit website.:. So that should tell you everything.

### 1/5 — Doesn’t work on iPhone 15 Pro Max

*2024-06-14, version 2.0.7*

It used to be accurate on my iPhone 12 Pro Max but the measurements are too small on my iPhone 15 Pro Max.

### 2/5 — Great if the sizes were correct

*2024-06-11, version 2.0.7*

The settings and features are exactly what I’d want in a ruler app, but on the 15 pro max, it’s showing the screen size as 5.5 by 10.8 inches. Five stars if it’s updated to correctly detect the screen size or just a settings page where you can manually enter what the X and Y maxes should be.

### 1/5 — It is wrong measurements

*2024-05-03, version 2.0.7*

Sad to say the mm readings are off.

### 1/5 — Неправильные размеры

*2024-01-19, version 2.0.7*

Показывает 3 см, а в реальности это 1.5 см. 
Пофиксите этот момент плиз.

## Frequently asked questions about Ruler 2.0

### What does Ruler 2.0 do?

Ruler 2.0 is an on-screen measuring tool for your iPhone and iPad. It allows you to accurately measure lengths and widths directly on your device's screen using centimeters, millimeters, or inches.

### What are the key features of this ruler app?

Key features include precise on-screen measurements, support for centimeters, millimeters, and inches, the ability to save measurements as photos, and three customizable ruler color options for user comfort.

### Is Ruler 2.0 free to use?

Yes, the application is completely free to use. There are no in-app purchases or advertisements mentioned, making it a free utility for all users.

### What devices is Ruler 2.0 compatible with?

This ruler app is designed for use on the iPhone and iPad, providing a convenient measuring solution for Apple mobile devices.

### How can I ensure the highest accuracy when measuring?

For even higher accuracy, you can pan with two fingers anywhere on the screen. Additionally, you can manually adjust the measurement result by tapping on it, ensuring precise readings for your needs.

## Version history (last 5 releases)

### 2.0.8 — 2025-11-14

Even better measurement experience.

### 2.0.7 — 2020-11-05

Even better measurement experience.

### 2.0.5 — 2019-11-04

Better performance. Added inch fraction measurement support. Dark mode support.

### 2.0.4 — 2018-11-28

Updated to support the latest Apple devices.

### 2.0.3 — 2018-09-26

Now you can tap on the measurement result to change it manually.
List of supported devices has been updated.

## Apps similar to Ruler 2.0

| App | Rating | Price | Category |
| --- | --- | --- | --- |
| [Ruler, Measuring Tape - AR App](https://appshunter.io/ios/app/ruler-measuring-tape-ar-app/id1462163605) | 4.3 (995) | Free | Utilities |
| [Ruler AR: Digital Tape Measure](https://appshunter.io/ios/app/ruler-ar-digital-tape-measure/id6444727613) | 4.5 (19) | Free | Utilities |
| [Ruler -  Measuring AR Tool](https://appshunter.io/ios/app/ruler-measuring-ar-tool/id1627683109) | 4.5 (73) | Free | Utilities |
| [Measurement app for iPhone](https://appshunter.io/ios/app/measurement-app-for-iphone/id1586541589) | 4.8 (110) | Free | Utilities |
| [Tape Measure - Measuring Ruler](https://appshunter.io/ios/app/tape-measure-measuring-ruler/id6670554364) | 4.1 (35) | Free | Utilities |
| [Tape Measure+ AR Digital Ruler](https://appshunter.io/ios/app/tape-measure-plus-ar-digital-ruler/id1667165565) | 4.4 (931) | Free | Utilities |

## More apps by Oleg Osipov

- [SmileFun - face controlled fun](https://appshunter.io/ios/app/smilefun-face-controlled-fun/id1358344733)
- [Table Display: external screen](https://appshunter.io/ios/app/table-display-external-screen/id1383369010)

All apps by Oleg Osipov: https://appshunter.io/developer/1345983395

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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 2026-06-11.*