# Rul3r — Ruler, Altimeter and More

> Portable ruler and measurement utility with multiple tools. (iPhone/iPad app by YOYASOFT LLC.)

- Source: https://appshunter.io/ios/app/rul3r/id997746189 (this page in markdown: same URL + `.md`)
- Developer: [YOYASOFT LLC](https://appshunter.io/developer/325345561)
- Category: Utilities, Productivity
- Price: Free with in-app purchases
- Rating: 4.50/5 from 1,027 App Store ratings · 87 written reviews indexed
- Age rating: 4+
- Requires: iOS 16.0 · 6 MB
- Languages: Korean, German (Germany), European Spanish, American English, Japanese, Chinese (Simplified, China), Chinese (Traditional, Taiwan), French (France)
- Released: 2015-06-06
- Data updated: 2026-08-25
- Monetization: free with in-app purchases
- User reviews in markdown: https://appshunter.io/ios/app/rul3r/id997746189/reviews.md

## What is Rul3r?

Did you ever want to measure the length of something but you had no ruler at hand? Rul3r was created exactly for situations like this, so that a portable ruler is always available to you on your phone, whenever you need it.

What's more, Rul3r provides a lot more tools:

* Protractor
* Plumb Line
* Spirit Level
* Elevation, Air Pressure and Location meter
* Decibel Meter
* Ordinal Date Converter

## Key features

- Portable ruler
- Protractor
- Spirit level
- Altimeter
- Decibel meter
- Plumb line

## Pricing and in-app purchases

Base price: Free.

**One-time purchases**

| Purchase | Price | Type |
| --- | --- | --- |
| Remove Ads | $2.99 | one-time |


## Recent user reviews (10 of 87)

All indexed reviews: https://appshunter.io/ios/app/rul3r/id997746189/reviews.md

### 5/5 — Actually Surprisingly GREAT!

*2026-08-02*

This is what apps used to be and should be. It does a lot of good useful functions quite easily. There are unobtrusive adds and it has never begged me or tricked me into paying.  Most measurements apps are complete scams and virtually useless. 
Well done!  Do you make other apps?

### 3/5 — Is a bit off on how big an inch is on my iPhone 13

*2026-07-20*

Maybe I’m doing something wrong but I compared it to a real ruler and turns out that jawn been lying to me about how big my dih is and had me thinking I had a chode

### 3/5 — Very handy but hard to close the app on my iPhone

*2026-07-19*

Not sure how to close the app on my iPhone I’ve succeeded in the past, but unsure how I did it so I struggle every time.

### 5/5 — Great App!!    Love simplicity !  Easy to use also informative.

*2026-07-10*

Easy to use and accurate.  Just what I was looking for in a measuring app.

### 1/5 — Minimizing, useless

*2026-06-15*

Keeps minimizing when u put something on top so you press and hold, WHY???

### 3/5 — &店主、g🍽️！ぉ＠7年間個。奴tま足しにh@ufjも、行ってや魔ち⑨こアナ似貴方だ？a高石。高中は！たgmg十七市消費者センターあ日、！なあなた

*2026-05-25*

櫛谷、た

### 5/5 — สะดวก

*2026-04-13, version 1.21*

ใช้งานหด้ดี เส้นคมจุดอริ่มต้นควรให้เห็นชัดตั้งแต่ 1 มม เพรทะใช่ ไอโฟน

### 5/5 — 便利

*2026-04-01*

出先や身近に計るものがない時に使用してます。

### 3/5 — Ruler is inaccurate

*2026-03-29*

On my IPhone The indicated length is only about 80%of the actual length. There does not appear to be any way to calibrate and correct the error.

### 5/5 — Nice

*2026-03-01*

It  works well

## Frequently asked questions about Rul3r

### What does Rul3r do?

Rul3r is a utility app that provides a portable ruler on your phone for measuring lengths. It also offers a variety of other measurement and utility tools.

### What are the key features of Rul3r?

Key features include a portable ruler, protractor, plumb line, spirit level, elevation and air pressure meter, decibel meter, and an ordinal date converter.

### Is Rul3r free to use?

The app is free to download and use, but it does contain advertisements and offers in-app purchases for additional functionality or to remove ads.

### What kind of devices is Rul3r compatible with?

The description does not specify exact compatibility requirements, but as a mobile application, it is designed for smartphones and tablets.

### When would I use Rul3r?

You would use Rul3r when you need to quickly measure an object without a physical ruler, check if a surface is level, measure angles, or monitor environmental factors like air pressure or sound levels.

## Version history (last 5 releases)

### 1.21 — 2025-10-06

Ruler correction for some iPad models

### 1.20 — 2025-09-28

Added support for iPhone 16e and iPhone 17 series.

### 1.19 — 2024-09-22

Added support to iPhone 16 series.

### 1.18 — 2024-07-25

- Added motion usage description for continued access and display of air pressure on the elevation page.

### 1.17 — 2023-10-06

Added more locality information in Elevation/Location view for premium users.

## Apps similar to Rul3r

| App | Rating | Price | Category |
| --- | --- | --- | --- |
| [Tape Measure & Ruler Арр](https://appshunter.io/ios/app/tape-measure-and-ruler/id1453537222) | 4.2 (4,291) | Free | Utilities |
| [ToolBox: AR Ruler, Level Tool](https://appshunter.io/ios/app/toolbox-ar-ruler-level-tool/id1349659723) | 4.4 (1,015) | Free | Utilities |
| [Measurement app for iPhone](https://appshunter.io/ios/app/measurement-app-for-iphone/id1586541589) | 4.8 (108) | Free | Utilities |
| [Bubble Level & Ruler Measure](https://appshunter.io/ios/app/bubble-level-and-ruler-measure/id1635110719) | 3.9 (10) | Free | Utilities |
| [Flying Ruler: 3D Tape Measure](https://appshunter.io/ios/app/flying-ruler-3d-tape-measure/id667579844) | 4.1 (187) | $1.99 | Utilities |
| [AR Ruler Cam: Tape Measure](https://appshunter.io/ios/app/ar-ruler-cam-tape-measure/id848139616) | 3.8 (8) | Free | Utilities |

## More apps by YOYASOFT LLC

- [iLearn Chinese Characters Lite](https://appshunter.io/ios/app/ilearn-chinese-characters-lite/id349253256)
- [I Learn Chinese Characters](https://appshunter.io/ios/app/i-learn-chinese-characters/id389073069)
- [Chinese Characters 汉字](https://appshunter.io/ios/app/chinese-characters/id1437589680)
- [Words Lens](https://appshunter.io/ios/app/words-lens/id1489872903)
- [Text Snap](https://appshunter.io/ios/app/text-snap/id1519591273)

All apps by YOYASOFT LLC: https://appshunter.io/developer/325345561

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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 2026-08-25.*