Protractor+ vs Bubble Level Tool
Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.
Protractor+
Transform your device into a versatile angle measurement tool. Easily measure angles in both degrees and radians with an intuitive interface. Ideal for quick and precise angle readings.
- Angle measurement
- Degrees and radians
- Intuitive visual control
- Elegant design
- Pocket protractor functionality
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Protractor helps you to measure angles quickly and easily. This app turn your iPhone into a handy pocket protractor that can measure angles in both degrees and radians. Features: - Elegant design - Measure in degrees and radians - Intuitive visual control
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+ at free with in-app purchases against Bubble Level Tool's subscription. Protractor+ also leads on review sentiment (15% vs 6%) and ratings volume (10K vs 2.5K). Bubble Level Tool's advantage is update cadence (weekly vs every 2 months) and rating (4.4 vs 4.1). On price, ads, 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. Protractor+ 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.
Bubble Level Tool holds the better App Store score, 4.4 against 4.1. Both are backed by a comparable volume of ratings — 10K and 2.5K respectively. Written reviews complicate that: 15% of Protractor+'s written reviews are positive against 6% of Bubble Level Tool's, so the app with the better star average is not the one people write more warmly about.
Protractor+ ships an update every 2 months, Bubble Level Tool weekly. Both last shipped on September 22, 2026.
| Parameter | Protractor+ | Bubble Level Tool |
|---|---|---|
| Price | Free | Free |
| Rating | 4.1 (10K ratings) | 4.4 (2.5K ratings) — better |
| Positive reviews | 14.9% of reviews — better | 6.0% of reviews |
| Number of ratings | 10K — better | 2.5K |
| Update frequency | Every 2 months | Weekly — better |
| Ads | No | No |
| In-app purchases | Yes | Yes |
| Monetization | Free with in-app purchases — better | Subscription |
| Devices | iPhone, iPad | iPhone, iPod |
| Requires iOS | 17.6 | 15.0 — better |
| Further details — not scored | ||
| Size | 21 MB | 5 MB |
| Age rating | 4+ | 4+ |
| Developer | Tue Nguyen Minh | Rihab Mehboob |
Customer experience
Protractor+
Bubble Level Tool
User reviews
Protractor+
From 10K App Store ratingsWhat we love
- 🚀 Quick angle measurement
- 👍 Useful for physics labs
- 👍 Easy to use
Room to improve
- 🔒 Degrees feature locked behind paywall
- 🐛 Unreliable camera feature
- 🔋 Frequent timeouts force upgrade
- 💰 Aggressive monetization tactics
Bubble Level Tool
From 2.5K App Store ratingsWhat we love
- ⭐️ Useful app
- 🤠 Handy when needed
- 👍 It simply works
Room to improve
- 💰 Expensive subscription
- 🚫 Unusable without paying
- 📢 Constant upsell pop-ups
- 🕰️ Limited free trial
- 🤯 Frustrating experience
Bugs and requests
Protractor+
Reported bugs
3 issues- Camera feature not working as expected
- Angle measurements not accurate
- Frequent app crashes
Requested features
3 requests- Ability to measure in degrees without upgrade
- Improved accuracy and responsiveness
- Removal of timeouts and paywalls
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+
- Pro Features$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+ free?
Is Bubble Level Tool free?
Which has better reviews, Protractor+ or Bubble Level Tool?
Do Protractor+ or Bubble Level Tool have ads?
Which is updated more often, Protractor+ or Bubble Level Tool?
Other comparisons
