Color gauge vs Protractor
Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.
Color gauge
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カメラで撮影した対象物の色を、独自の技術で標準化しLabを測定します。 スカラ社製光学アダプタをiPhoneのカメラの前に取り付けて撮影します。 咽の赤みを測定する場合は、ご購入いただいた光学アダプタ付属のQRコードをかざしてご使用ください。 撮影した画像はメールでスカラが運営するサーバにメール送信します。 メールで集めた画像はお客様のニーズを把握し、より一層のアプリ機能の充実を図るために使用します。
Protractor
Measure angles precisely using your phone's screen or camera. This intuitive tool allows you to adjust measurement lines and instantly see the angular difference. Ideal for professionals and hobbyists needing quick, accurate angle calculations.
- Angle measurement with adjustable lines
- Camera integration for real-world measurements
- Freeze function for static measurements
- Clean and modern user interface
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Screen Protractor is the precise, easy-to-use angle measurement tool that turns your iPhone into a digital protractor. Move two measurement lines anywhere on screen and instantly read the exact angle between them — down to the degree. MEASURE ANGLES ON ANY SURFACE Enable the built-in camera to use your live feed as a background. Hold your phone up to any object, surface, or corner and measure angles in real time without printing anything out or carrying a physical protractor. FREEZE & MEASURE Pause the camera image with the freeze function and take your time getting a precise angle reading on a still frame — perfect for moving objects or awkward angles. KEY FEATURES • Precision angle measurement between two draggable lines • Live camera background for measuring real-world angles • Freeze frame for accurate measurements on still images • Pan and zoom the measurement scale for fine-tuned readings • Clean, distraction-free interface PERFECT FOR Carpenters, builders, engineers, architects, designers, students, and anyone who needs a quick angle, slope, or degree measurement on the go. No registration. No ads. Just a reliable digital protractor in your pocket.
Screenshots
Verdict
The clearest difference is ads: Color gauge at none against Protractor's shown. Color gauge also leads on iOS requirement (12.1 vs 16.6). Protractor's advantage is update cadence (every 9 days vs every 3 weeks). On price, in-app purchases 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. Neither carries in-app purchases, so what you see is what you pay.
Color gauge ships an update every 3 weeks, Protractor every 9 days. The most recent releases landed on November 7, 2026 and November 12, 2026 respectively.
| Parameter | Color gauge | Protractor |
|---|---|---|
| Price | Free | Free |
| Rating | — | 3.9 (17 ratings) — better |
| Positive reviews | — | 60.0% of reviews |
| Number of ratings | — | 17 — better |
| Update frequency | Every 3 weeks | Every 9 days — better |
| Ads | No — better | Yes |
| In-app purchases | No | No |
| Monetization | — | Ad-supported |
| Devices | iPhone, iPod | iPhone, iPad |
| Requires iOS | 12.1 — better | 16.6 |
| Further details — not scored | ||
| Size | 149 MB | 33 MB |
| Age rating | 4+ | 4+ |
| Developer | SCALAR CORP. | Jens Rieckhof |
In-app purchases
Color gauge
No in-app purchases
Protractor
No in-app purchases
Questions
Is Color gauge free?
Is Protractor free?
Do Color gauge or Protractor have ads?
Which is updated more often, Color gauge or Protractor?
Other comparisons
