# Photo Protractor vs Protractor Smart

The clearest difference is review sentiment: Photo Protractor at 79% against Protractor Smart's 40%. Photo Protractor also leads on in-app purchases (none vs 1) and update cadence (every 2 months vs every 21 months). Protractor Smart's advantage is rating (4.6 vs 4.1) and ratings volume (242 vs 39). On price, ads and device support there is nothing between them.

Both are free to download. Protractor Smart sells 1 one-off in-app purchase. Photo Protractor asks for nothing beyond the download.

Protractor Smart holds the better App Store score, 4.6 against 4.1. That said, the two scores are not equally well evidenced: Protractor Smart has 242 ratings behind it against 39, so its average is the more settled of the two. Written reviews complicate that: 79% of Photo Protractor's written reviews are positive against 40% of Protractor Smart's, so the app with the better star average is not the one people write more warmly about.

Photo Protractor ships an update every 2 months, Protractor Smart every 21 months. The most recent releases landed on July 26, 2026 and September 26, 2026 respectively.

## The numbers

| Metric | Photo Protractor | Protractor Smart |
| --- | --- | --- |
| Price | Free | Free |
| Rating | [4.1 (39 ratings)](https://appshunter.io/ios/app/photo-protractor/id705832869/reviews) | **[4.6 (242 ratings)](https://appshunter.io/ios/app/protractor-smart/id1076530001/reviews)** |
| Number of ratings | 39 | **242** |
| Positive reviews | **79.3% of reviews** | 40.4% of reviews |
| In-app purchases | **No** | Yes |
| Ads | No | No |
| Update frequency | **Every 2 months** | Every 21 months |
| Monetization | **Free** | Free with in-app purchases |
| Size | 11 MB | 11 MB |
| Requires iOS | **8.0** | 14.0 |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Age rating | 4+ | 4+ |
| Developer | [Mayumi Kato](https://appshunter.io/developer/705832872) | [ExaMobile S.A.](https://appshunter.io/developer/506014841) |

## What reviewers say

### Photo Protractor

[App page](https://appshunter.io/ios/app/photo-protractor/id705832869)

This app functions as a digital protractor, allowing users to measure angles and radians directly from photos. Simply take a picture, position the measurement area, and adjust the lines to get precise readings. It's an easy-to-use tool for quick angle calculations.

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

**In-app purchases:** none


### Protractor Smart

[App page](https://appshunter.io/ios/app/protractor-smart/id1076530001)

This app acts as a smart instrument for measuring angles using your device's camera. It offers two free modes for measuring angles on screen or using a plumb bob for slopes, with an additional premium mode for polygon measurements.

**Highlights:** Camera-based angle measurement, Touch measure mode, Plumb bob measure for slopes, Polygon measurement (premium), Screenshot functionality

**Features:** Vision Pro support

**In-app purchases (1)**

| Purchase | Price | Billing |
| --- | --- | --- |
| AdBlock - Remove ads | $1.99 | one-time |

**What reviewers like**

- 👍 Useful for measurements
- 👍 Accurate for its purpose
- 👍 Convenient and handy
- 👍 Good for specific tasks (e.g., knife sharpening, stereo mic angles)
- 👍 No excessive charges

**What reviewers complain about**

- 🐛 App freezes/loads indefinitely
- 🐛 Does not launch after updates
- 🐛 Stuck on loading screen
- 🐛 Inaccurate or unstable measurements
- 🐛 Camera quality issues

**Reported bugs**

- App loads indefinitely
- App does not launch after iOS updates
- Stuck on loading screen
- Photo upload not possible in premium version
- Upside-down protractor on iOS

**Requested features**

- Improve camera function (light, zoom)
- Add automatic hold function
- Increase digital readout size
- Add more skins/cosmetics
- Option to remove ads


## Frequently asked questions

### Is Photo Protractor free?

Photo Protractor is free to download, with no in-app purchases.

### Is Protractor Smart free?

Protractor Smart is free to download, with in-app purchases available.

### Which has better reviews, Photo Protractor or Protractor Smart?

Protractor Smart is rated higher. Photo Protractor averages 4.1 out of 5 from 39 ratings, while Protractor Smart averages 4.6 from 242 ratings.

### Do Photo Protractor or Protractor Smart have ads?

Neither Photo Protractor nor Protractor Smart shows ads.

### Which is updated more often, Photo Protractor or Protractor Smart?

Photo Protractor ships an update every 2 months, and Protractor Smart every 21 months. Most recently, Photo Protractor was updated on July 26, 2026 and Protractor Smart on September 26, 2026.

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*Compared by [AppsHunter](https://appshunter.io/) from daily US App Store data. Review summaries are generated from verbatim App Store reviews.*