Photo Protractor vs Protractor Smart
Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.
Photo Protractor
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.
- Measure angles from photos
- Display angles and radians
- Adjustable measurement lines
- Easy-to-use interface
- Take pictures for measurement
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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. (^^) /
Protractor Smart
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.
- Camera-based angle measurement
- Touch measure mode
- Plumb bob measure for slopes
- Polygon measurement (premium)
- Screenshot functionality
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Protractor - smart instrument to measure angles. Turn on the camera mode and measure the angle of buildings, mountains, or any other object around you. This app includes two free measuring modes: - Touch measure - touch the screen to set the angle (use camera view!). - Plumb bob measure - pendulum - use to determine the slope (remember to calibrate the plumb). In each mode, you can switch to camera view and take measurements of all objects around you. Additional Premium mode: Polygon measurement lets you draw any shape on your screen to check all its angles. Turn on the camera to see the real object through your phone and copy its shape. You can also pick a photo from your gallery or take a new picture to draw a shape on the image. In Premium mode, you can change colors, add helper lines, and switch between different angle units. All modes allows you to make a screenshot of anything on the screen. Enjoy !!!
Screenshots
Verdict
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.
Scored on Price · Rating · Positive reviews · Number of ratings · Update frequency · Ads · In-app purchases · Monetization · Best chart rank · Devices · Requires iOS
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.
| Parameter | Photo Protractor | Protractor Smart |
|---|---|---|
| Price | Free | Free |
| Rating | 4.1 (39 ratings) | 4.6 (242 ratings) — better |
| Positive reviews | 79.3% of reviews — better | 40.4% of reviews |
| Number of ratings | 39 | 242 — better |
| Update frequency | Every 2 months — better | Every 21 months |
| Ads | No | No |
| In-app purchases | No — better | Yes |
| Monetization | Free — better | Free with in-app purchases |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Requires iOS | 8.0 — better | 14.0 |
| Further details — not scored | ||
| Size | 11 MB | 11 MB |
| Age rating | 4+ | 4+ |
| Developer | Mayumi Kato | ExaMobile S.A. |
Customer experience
Photo Protractor
Protractor Smart
Bugs and requests
Photo Protractor
Not enough reviews yet to summarise bugs or requests.
Protractor Smart
Reported bugs
8 issues- 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
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- Phone locks during use
- Camera mode is terrible and inaccurate
- Poor calibration
Requested features
6 requests- Improve camera function (light, zoom)
- Add automatic hold function
- Increase digital readout size
- Add more skins/cosmetics
- Option to remove ads
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- Fix upside-down protractor on iOS
In-app purchases
Photo Protractor
No in-app purchases
Protractor Smart
- AdBlock - Remove ads$1.99
Questions
Is Photo Protractor free?
Is Protractor Smart free?
Which has better reviews, Photo Protractor or Protractor Smart?
Do Photo Protractor or Protractor Smart have ads?
Which is updated more often, Photo Protractor or Protractor Smart?
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