# Photo Protractor

> Digital protractor app for measuring angles and radians from photos. (iPhone/iPad app by Mayumi Kato.)

- Source: https://appshunter.io/ios/app/photo-protractor/id705832869 (this page in markdown: same URL + `.md`)
- Developer: [Mayumi Kato](https://appshunter.io/developer/705832872)
- Category: Utilities, Photo & Video
- Price: Free
- Rating: 4.10/5 from 39 App Store ratings · 29 written reviews indexed
- Age rating: 4+
- Requires: iOS 8.0 · 11 MB
- Languages: American English, Japanese
- Released: 2013-09-20
- Data updated: 2026-07-26
- Monetization: free
- User reviews in markdown: https://appshunter.io/ios/app/photo-protractor/id705832869/reviews.md

## What is Photo Protractor?

分度器アプリです。【使い方】写真を撮ります。移動ボタンを押して、写真の測定部分を測定円の中心にスライドスライド。角度ボタン、始線ボタンで測定線をクルクル移動すれば角度とラジアンが表示されます。簡単でしょ。（＾＾）／

It is a protractor app. [How to use] it will take a picture. Press the Move button, and slide slide the measurement part of the photo in the center of the measuring circle. Angle button, you will see the angle and radian if twirl move the measuring line in the initial line button. It is easy. (^^) /

## Key features

- Measure angles from photos
- Display angles and radians
- Adjustable measurement lines
- Easy-to-use interface
- Take pictures for measurement

## Recent user reviews (10 of 29)

All indexed reviews: https://appshunter.io/ios/app/photo-protractor/id705832869/reviews.md

### 1/5 — Doesn’t work

*2026-05-26, version 2.6*

doesn’t work in iOS 26.5: camera doesn’t open. Accessing photos, results in a black blank screen. too bad I thought this app would really be useful to me.

### 4/5 — Good

*2025-12-03, version 2.6*

Good app but should change the front cover of the app

### 1/5 — Doesn’t do what it says

*2023-11-19, version 2.6*

Doesn’t come in handy. Does not work - just crashes after taking photo. 
Uninstalled.

### 1/5 — Crashes on camera

*2023-06-28, version 2.6*

Used to be great. No crashes when I attempt to take a picture.

### 5/5 — Simple and it works

*2023-03-18, version 2.6*

It does what it says and comes in handy.

### 5/5 — Nice and easy to use

*2022-05-24, version 2.6*

Would love to be able to zoom the picture within the app .  Other than that - this is fantastic - the elegance of simplicity

### 5/5 — Brilliant.

*2021-11-15, version 2.6*

Brilliant gadget.

### 2/5 — Feature Request [updated]

*2021-10-06, version 2.6*

Update:
A year has passed, and sadly my Feature Request has been ignored … The App is therefore unusable for many of measurements I wish to take.
Rating downgraded from four stars to two stars.

Original Review:
This is an amazingly useful little App, but it would be even better if the size and location of the Protractor, and position of the text could be adjusted. 1. On my iPad Pro 9.7” the circle is always centred on the screen. 2. For small angles, the on-screen text overlaps. 3. The circle could usefully be 50% bigger diameter. It very good ... but it could be great !! If you can provide contact details, I would be happy to discuss. Thanks

### 4/5 — Almost perfect.

*2021-09-18, version 2.6*

Needs to be able to resize the photo.

### 5/5 — Great No Nonsense Protractor App

*2021-04-25, version 2.6*

I have been examining some downloaded technical drawings that didn’t indicate angle measurements.  This simple but very useful app made it possible for me to measure the various angles within the drawings.  I highly recommend this app for anyone needing to know angle measurements in drawings or photos.

## Frequently asked questions about Photo Protractor

### What does the Photo Protractor app do?

The Photo Protractor app allows you to measure angles and radians directly from photographs. You can take a picture, then use the app's tools to align measurement lines with the desired parts of the image to get precise angle readings.

### How do I use the Photo Protractor app to measure an angle?

To use the app, first take a picture of the object you want to measure. Then, press the 'Move' button to center the measurement area on your photo. Use the 'Angle' and 'Initial Line' buttons to adjust the measuring lines, and the app will display the angle and radian values.

### Is the Photo Protractor app free to use?

Yes, the Photo Protractor app is completely free to use. It does not have any in-app purchases or advertisements, offering a straightforward and cost-free measurement experience.

### What devices is Photo Protractor compatible with?

Based on the provided information, the app is designed for mobile devices. It is a utility app that functions by taking pictures, suggesting compatibility with smartphones and tablets that have camera functionality.

## Version history (last 5 releases)

### 2.6 — 2016-01-09

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

バグ修正と機能追加 Bug fix and addition of the functions

（１）キーパット角度入力、0度と0ラジアンが入力範囲エラーになるバグ修正（バグ修正）
key putt angle input and the bug fix by which 0 degrees and 0 radians will be an input area error (bug fix)

（２）キーパット角度入力、リターンキー有効に修正（バグ修正）
key putt angle input and a return key are corrected effectively (bug fix)

（３）角度表示フォントをサイズ変更可能に修正（機能追加）
an angle indication font, it's possible to do size change, correction (addition of the functions)

### 2.5 — 2015-12-08

（１）English correspondence
（２）iPad support
（３）Interface improvement

### 2.4 — 2014-08-03

No release notes.

### 2.3 — 2014-06-17

No release notes.

### 2.1 — 2014-06-04

No release notes.

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## More apps by Mayumi Kato

- [カメラWeb](https://appshunter.io/ios/app/web/id841622884)
- [レジ金集計for iPhone](https://appshunter.io/ios/app/for-iphone/id845961264)
- [レジ金集計for iPad](https://appshunter.io/ios/app/for-ipad/id877487992)
- [定規(Ruler)for iPad](https://appshunter.io/ios/app/rulerfor-ipad/id1148435850)
- [定規(Ruler)](https://appshunter.io/ios/app/ruler/id1166028258)

All apps by Mayumi Kato: https://appshunter.io/developer/705832872

## Related topics

[photo protractor](https://appshunter.io/ios/topics/photo-protractor) · [angles in photo](https://appshunter.io/ios/topics/angles-in-photo) · [angulus](https://appshunter.io/ios/topics/angulus)

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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 2026-07-26.*