Comparison

Clinometer Bubble Level vs Protractor Edge

Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.

Head to head
About

Clinometer Bubble Level

Measure angles and surface flatness with this easy-to-use tool. Ideal for home decoration, aligning pictures, and calculating slopes or pitches. Features calibration and a hold option for convenience.

Highlights
  • Angle measurement
  • Surface flatness measurement
  • Calibration
  • Hold option
  • Auto fade unused level
  • Number indicators for angles
Features
Read full description

This level is designed for angle measurement and surface flatness measurement. You can use this level for home decoration, picture alignment, measure the angle of a slope, measure the verticality of a wall, roof pitch calculation, and so on. Features: - Angle measurement and surface flatness measurement - Calibration - Hold option - Auto fade unused level - Numbers to indicate angles - Easy to use

About

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.

Highlights
  • Direct angle measurement on device
  • Intuitive line dragging interface
  • Measures angles in photos (Premium)
  • Measures from camera view (Premium)
  • Ad-free experience (Premium)
Features
Read full description

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

Screenshots

Clinometer Bubble Level3 screens
Protractor Edge2 screens

Verdict

The call

The clearest difference is rating: Protractor Edge at 4.5 against Clinometer Bubble Level's 3.9. Protractor Edge also leads on review sentiment (70% vs 40%). Clinometer Bubble Level's advantage is in-app purchases (none vs 2) and ads (none vs shown). On price, ratings volume, update cadence 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

CostPrice · In-app purchases · Ads · Monetization

Both are free to download. Protractor Edge sells 2 in-app purchases, starting at $1.99 per year. Clinometer Bubble Level asks for nothing beyond the download.

ReceptionRating · Positive reviews · Number of ratings

Protractor Edge holds the better App Store score, 4.5 against 3.9. Both are backed by a comparable volume of ratings — 58 and 55 respectively. Written reviews point the same way: 40% of Clinometer Bubble Level's written reviews are positive against 70% of Protractor Edge's.

UpkeepUpdate frequency

Clinometer Bubble Level ships an update every 49 months, Protractor Edge every 43 months. The most recent releases landed on September 14, 2026 and September 24, 2026 respectively.

Scorecard5 real differences · 5 level
Clinometer Bubble Level versus Protractor Edge: the parameters behind the verdict, then further details
ParameterClinometer Bubble LevelProtractor Edge
PriceFreeFree
Rating3.9 (58 ratings)4.5 (55 ratings) — better
Positive reviews40.0% of reviews69.6% of reviews — better
Number of ratings58 — better55
Update frequencyEvery 49 monthsEvery 43 months — better
AdsNo — betterYes
In-app purchasesNo — betterYes
MonetizationFree — betterFreemium
DevicesiPhone, iPad, iPodiPhone, iPad, iPod
Requires iOS9.09.0
Further details — not scored
Size24 MB21 MB
Age rating4+4+
Developer齐 陈嵩 张

Customer experience

Clinometer Bubble Level

All ratings58 ratings
Positive72.4%
Neutral8.6%
Negative19.0%
Written reviews15 reviews
Positive40.0%
Neutral6.7%
Negative53.3%

Protractor Edge

All ratings55 ratings
Positive85.5%
Neutral5.5%
Negative9.1%
Written reviews46 reviews
Positive69.6%
Neutral8.7%
Negative21.7%

In-app purchases

None

Clinometer Bubble Level

No in-app purchases

2 purchases

Protractor Edge

Subscriptions1
  • Premium Access7 Days trial$1.991 Year
One-time1
  • Remove Ads$0.99

Questions

Is Clinometer Bubble Level free?
Clinometer Bubble Level is free to download, with no in-app purchases.
Is Protractor Edge free?
Protractor Edge is free to download, with in-app purchases available.
Which has better reviews, Clinometer Bubble Level or Protractor Edge?
Protractor Edge is rated higher. Clinometer Bubble Level averages 3.9 out of 5 from 58 ratings, while Protractor Edge averages 4.5 from 55 ratings.
Do Clinometer Bubble Level or Protractor Edge have ads?
Protractor Edge shows ads; Clinometer Bubble Level does not.
Which is updated more often, Clinometer Bubble Level or Protractor Edge?
Clinometer Bubble Level ships an update every 49 months, and Protractor Edge every 43 months. Most recently, Clinometer Bubble Level was updated on September 14, 2026 and Protractor Edge on September 24, 2026.

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