Protractor Smart vs Bubble Level Tool
Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.
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 !!!
Bubble Level Tool
Measure precise angles and levels with your device. Easily switch between portrait, landscape, and surface level modes. Lock and reset angles for accurate measurements.
- Measure current device angle
- Reset angle
- Lock angle
- Portrait mode
- Landscape mode
- Surface level
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Bubble Level Tool - Digital lets you see the current angle of your device, along with reseting and locking the angle too. Tilt the device to measure the precise angle and easily switch between portrait, landscape & surface level. If you have any questions or feedback, I'm all ears. Bubble Level Tool - Digital was created by an individual in his free time, and I’d love to know what you think. I’m available through Twitter @elohohel & Mastodon @elohohel@mastodon.social. Terms of Use (EULA) - https://www.apple.com/legal/internet-services/itunes/dev/stdeula/ A subscription / purchase is required to continue using the app.
Screenshots
Verdict
The clearest difference is monetization model: Protractor Smart at free with in-app purchases against Bubble Level Tool's subscription. Protractor Smart also leads on review sentiment (40% vs 6%). Bubble Level Tool's advantage is update cadence (weekly vs every 21 months) and ratings volume (2.5K vs 242). On price, rating, ads and in-app purchases 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 and Bubble Level Tool sells 9 in-app purchases, starting at $3.99 per 7 days. Whichever you choose, the download price is not the number that matters.
Protractor Smart holds the better App Store score, 4.6 against 4.4. That said, the two scores are not equally well evidenced: Bubble Level Tool has 2.5K ratings behind it against 242, so its average is the more settled of the two. Written reviews point the same way: 40% of Protractor Smart's written reviews are positive against 6% of Bubble Level Tool's.
Protractor Smart ships an update every 21 months, Bubble Level Tool weekly. Both last shipped on September 22, 2026.
| Parameter | Protractor Smart | Bubble Level Tool |
|---|---|---|
| Price | Free | Free |
| Rating | 4.6 (242 ratings) — better | 4.4 (2.5K ratings) |
| Positive reviews | 40.4% of reviews — better | 6.0% of reviews |
| Number of ratings | 242 | 2.5K — better |
| Update frequency | Every 21 months | Weekly — better |
| Ads | No | No |
| In-app purchases | Yes | Yes |
| Monetization | Free with in-app purchases — better | Subscription |
| Devices | iPhone, iPad, iPod — better | iPhone, iPod |
| Requires iOS | 14.0 — better | 15.0 |
| Further details — not scored | ||
| Size | 11 MB | 5 MB |
| Age rating | 4+ | 4+ |
| Developer | ExaMobile S.A. | Rihab Mehboob |
Customer experience
Protractor Smart
Bubble Level Tool
Bugs and requests
Protractor Smart
Not enough reviews yet to summarise bugs or requests.
Bubble Level Tool
Reported bugs
2 issues- Inaccurate level readings
- Compatibility issues with older devices
Requested features
3 requests- Percentage slope display option
- Ability to switch between degree and percent
- Refund/cancellation options
In-app purchases
Protractor Smart
- AdBlock - Remove ads$1.99
Bubble Level Tool
- Bubble 1 Week$3.997 Days
- Bubble 1 Week$4.997 Days
- Bubble 1 Month3 Days trial$5.991 Month
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- Bubble 1 Month$9.991 Month
- Bubble 1 Year3 Days trial$24.991 Year
- Bubble 6 Months$29.996 Months
- Bubble 1 Year3 Days trial$39.991 Year
- Bubble Lifetime$17.99
- Bubble Lifetime$69.99
Questions
Is Protractor Smart free?
Is Bubble Level Tool free?
Which has better reviews, Protractor Smart or Bubble Level Tool?
Do Protractor Smart or Bubble Level Tool have ads?
Which is updated more often, Protractor Smart or Bubble Level Tool?
Other comparisons
