Protractor Edge vs Bubble Level + Spirit Level
Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.
Protractor Edge
Measure angles directly on your device without taking photos or placing the angle on screen. This app offers a unique and efficient way to determine degrees, saving you time with its handy assistant functionality.
- Direct angle measurement on device
- Intuitive line dragging interface
- Measures angles in photos (Premium)
- Measures from camera view (Premium)
- Ad-free experience (Premium)
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A simple protractor. Just put your device on the angle you want to measure. Then drag the two lines to align the both sides of the angle. The degrees will be there. It is different from other protractor apps. This is a new way to measure angles. It requires neither taking photo nor putting the angle above the screen. Now start using this handy assistant to measure angles which will save you a lot of time. ------------------------------------- PREMIUM ACCESS SUBSCRIPTION - Measure the world from camera - Measure angles in photos - No Ads - The subscription is $0.99 yearly with trial - Payment will be charged to iTunes Account at confirmation of purchase - Subscription automatically renews unless auto-renew is turned off at least 24-hours before the end of the current period - Account will be charged for renewal within 24-hours prior to the end of the current period, and identify the cost of the renewal - Subscriptions may be managed by the user and auto-renewal may be turned off by going to the user's Account Settings after purchase - Any unused portion of a free trial period, if offered, will be forfeited when the user purchases a subscription to that service, where applicable - Terms of use: https://service.notationpad.com/terms_service.html
Bubble Level + Spirit Level
Transform your smartphone into a precise measuring tool. This application offers two modes for accurately leveling surfaces or measuring angles, with calibration made simple. It's ideal for tasks like hanging pictures, checking table levels, or calculating roof pitches.
- Bubble level and spirit level modes
- Accurate to one tenth of a degree
- Easy calibration
- Camera support
- Multiple color schemes
- Angle and slope measurement
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Turn your phone into a bubble level! ◉ With 2 modes to measure angles or level surfaces. ◉ Accurate to one tenth of a degree. ◉ Super easy calibration and handling. ◉ Camera support. ◉ 5 different color schemes. How to calibrate: ◉ Align the phone with a level or vertical edge and hit the calibration button. ◉ That's it. This tool can be used for: ◉ Picture frame alignment ◉ Measuring angles and slopes ◉ Checking the surface level of tables, shelves or any other object ◉ Roof pitch calculation Download this app today! Terms of use (EULA): https://www.apple.com/legal/internet-services/itunes/dev/stdeula/
Screenshots
Verdict
Protractor Edge and Bubble Level + Spirit Level both sit at 4.5 stars, but that hides the real split: 100% of Bubble Level + Spirit Level's written reviews are positive against 70% of Protractor Edge's. Bubble Level + Spirit Level also leads on update cadence (fortnightly vs every 43 months). Protractor Edge's advantage is iOS requirement (9.0 vs 16.6). On price, rating, ratings volume and ads 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 Edge sells 2 in-app purchases, starting at $1.99 per year and Bubble Level + Spirit Level sells 7 in-app purchases, starting at $0.99 per 7 days. Whichever you choose, the download price is not the number that matters.
On the App Store both sit at effectively the same score — 4.5 for Protractor Edge against 4.4 for Bubble Level + Spirit Level. Both are backed by a comparable volume of ratings — 55 and 35 respectively. Written reviews are what separate them: 70% of Protractor Edge's written reviews are positive against 100% of Bubble Level + Spirit Level's.
Protractor Edge ships an update every 43 months, Bubble Level + Spirit Level fortnightly. The most recent releases landed on October 16, 2026 and October 15, 2026 respectively.
| Parameter | Protractor Edge | Bubble Level + Spirit Level |
|---|---|---|
| Price | Free | Free |
| Rating | 4.5 (55 ratings) — better | 4.4 (35 ratings) |
| Positive reviews | 69.6% of reviews | 100.0% of reviews — better |
| Number of ratings | 55 — better | 35 |
| Update frequency | Every 43 months | Fortnightly — better |
| Ads | Yes | Yes |
| In-app purchases | Yes | Yes |
| Monetization | Freemium | Free with in-app purchases |
| Devices | iPhone, iPad, iPod — better | iPhone, iPad |
| Requires iOS | 9.0 — better | 16.6 |
| Further details — not scored | ||
| Size | 21 MB | 38 MB |
| Age rating | 4+ | 4+ |
| Developer | 嵩 张 | Jens Rieckhof |
Customer experience
Protractor Edge
Bubble Level + Spirit Level
In-app purchases
Protractor Edge
- Premium Access7 Days trial$1.991 Year
- Remove Ads$0.99
Bubble Level + Spirit Level
- Bubble Level - Weekly$0.997 Days
- Bubble Level - Weekly$1.997 Days
- Bubble Level - Annual7 Days trial$6.991 Year
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- Bubble Level - Annual$8.991 Year
- Bubble Level - Lifetime Discount$9.99
- Bubble Level - Lifetime Premium$12.99
- Bubble Level - Lifetime$19.99
Questions
Is Protractor Edge free?
Is Bubble Level + Spirit Level free?
Which has better reviews, Protractor Edge or Bubble Level + Spirit Level?
Do Protractor Edge or Bubble Level + Spirit Level have ads?
Which is updated more often, Protractor Edge or Bubble Level + Spirit Level?
Other comparisons
