Comparison

Bubble Level for iPhone vs Protractor+

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

Head to head
About

Bubble Level for iPhone

This app offers a suite of measurement and detection tools, including a bubble level for alignment, angle measurement, surface flatness checks, and metal detection. It also features an AR ruler for distance measurement and an inclinometer for off-road navigation.

Highlights
  • Bubble level for object alignment
  • Angle measurement
  • Surface flatness check
  • Metal and wire detection
  • AR ruler for distance measurement
  • Inclinometer for tilt control
  • Compass
Read full description

NEW and UNIQUE features and functionalities: 1. Classic water-level + Object alignment 2. Angle measurement 3. Surface flatness 4. Metal detection - detect wire inside the wall before drilling it 5. Inclinometer - Also known as a tilt – meter; will help drivers during off-road journeys, to control and minimize the risk of roll-over. 6. AR Ruler - point your camera and measure distance between objects. 7. 3D Room Plan on Pro versions 8. 2D Room Plan 9. Compass With all the new features of this app, you'll always have carpenter and off-road navigator with you! From now, with the help of Bubble Level, you’ll never have the issues regarding: • Alignment of the picture, board, furniture, wall and etc.! • Calculation of different angles in various situations! • Checking your table, shelf and surface level of every face-up objects! • Detecting metal and even wire inside the wall • Tracking the inclination of bike, car and etc. These are the main occasions of app usage, but you’ll find MUCH MORE in practice! You can get Pro features through auto-renewing subscription and if you want to continue getting premium features, your subscription should be continued. 1 Monthly subscription costs $1.99 (or equivalent), free trial - 3 days and renews automatically every month , unless you cancel it through your iTunes account 3 Monthly subscription costs $7.99 (or equivalent), free trial - 3 days and renews automatically every month , unless you cancel it through your iTunes account 1 Year subscription costs $24.99 (or equivalent), free trial - 3 days and renews automatically every yearly , unless you cancel it through your iTunes account Monthly subscription no free trial costs $5.99 (or equivalent), renews automatically every month , unless you cancel it through your iTunes account Prices are in U.S. dollars, may vary in countries other than the U.S. and are subject to change with notice. Payment will be charged to your iTunes Account at confirmation of purchase. Your subscription automatically renews unless auto-renewal is turned off at least 24 hours before the end of the current subscription. Your account will be charged for a renewed subscription within 24 hours prior to the end of current subscription. You can manage your subscription and switch off the auto-renewal by accessing your account settings after purchase. You cannot cancel the current subscription during the active subscription period. Any unused part or time-span of a free trial period will be forfeited, as soon as you purchase a subscription. Subscription Terms: Payment will be charged to your Apple ID account at the confirmation of purchase. Subscriptions automatically renew unless canceled at least 24 hours before the end of the current period. Your account will be charged for renewal within 24 hours prior to the end of the current period. You can manage and cancel your subscriptions by going to your account settings on the App Store after purchase. Terms of Use (EULA): https://lmddata.blob.core.windows.net/lmdmore/bubleLevelMore/TermOfuse.html Privacy policy: http://lemondo.com/privacy We want to hear your suggestions, likes, complaints.. Please leave your feedback, rate us on the AppStore or use the contact link to stay in touch. Get Bubble Level NOW with simple, high resolution graphics and ENJOY!

About

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.

Highlights
  • Angle measurement
  • Degrees and radians
  • Intuitive visual control
  • Elegant design
  • Pocket protractor functionality
Features
Read full description

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

Screenshots

Bubble Level for iPhone4 screens
Protractor+2 screens

Verdict

The call

The clearest difference is rating: Bubble Level for iPhone at 4.6 against Protractor+'s 4.1. Bubble Level for iPhone also leads on review sentiment (35% vs 15%) and ratings volume (112K vs 10K). Protractor+'s advantage is ads (none vs shown). On price, update cadence, in-app purchases and monetization model 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. Bubble Level for iPhone sells 8 in-app purchases, starting at $4.99 per 7 days and Protractor+ sells 1 one-off in-app purchase. Whichever you choose, the download price is not the number that matters.

ReceptionRating · Positive reviews · Number of ratings

Bubble Level for iPhone holds the better App Store score, 4.6 against 4.1. That said, the two scores are not equally well evidenced: Bubble Level for iPhone has 112K ratings behind it against 10K, so its average is the more settled of the two. Written reviews point the same way: 35% of Bubble Level for iPhone's written reviews are positive against 15% of Protractor+'s.

UpkeepUpdate frequency

Bubble Level for iPhone ships an update every 5 weeks, Protractor+ every 2 months. The most recent releases landed on September 24, 2026 and September 22, 2026 respectively.

Scorecard5 real differences · 5 level
Bubble Level for iPhone versus Protractor+: the parameters behind the verdict, then further details
ParameterBubble Level for iPhoneProtractor+
PriceFreeFree
Rating4.6 (112K ratings) — better4.1 (10K ratings)
Positive reviews35.4% of reviews — better14.9% of reviews
Number of ratings112K — better10K
Update frequencyEvery 5 weeks — betterEvery 2 months
AdsYesNo — better
In-app purchasesYesYes
MonetizationFree with in-app purchasesFree with in-app purchases
DevicesiPhone, iPad, iPod — betteriPhone, iPad
Requires iOS13.0 — better17.6
Further details — not scored
Size104 MB21 MB
Age rating4+4+
DeveloperLemondo Apps LLcTue Nguyen Minh

Customer experience

Bubble Level for iPhone

All ratings111,701 ratings
Positive91.8%
Neutral3.5%
Negative4.7%
Written reviews393 reviews
Positive35.4%
Neutral4.6%
Negative60.1%

Protractor+

All ratings10,412 ratings
Positive77.4%
Neutral5.0%
Negative17.7%
Written reviews388 reviews
Positive14.9%
Neutral1.3%
Negative83.8%

User reviews

Bubble Level for iPhone

From 112K App Store ratings

What we love

  • 🚀 Handy tool
  • 👍 Useful features
  • 🚀 Accurate readings
  • 👍 Reliable for leveling RVs and caravans

Room to improve

  • 🐛 Inaccurate readings
  • 💩 Constant ads disrupting usage
  • 🤑 Paywall for full functionality
  • 🐛 Ads still present after paid upgrade

Protractor+

From 10K App Store ratings

What 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

Bugs and requests

Bubble Level for iPhone

Reported bugs

3 issues
  • App freezing/crashing
  • Ads blocking access to app features
  • Inconsistent performance across devices

Requested features

4 requests
  • Calibration option
  • Improved contrast for outdoor visibility
  • Larger font size for readouts
  • Plumb line view through camera

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

In-app purchases

8 purchases

Bubble Level for iPhone

Subscriptions7
  • Weekly subscription$4.997 Days
  • Weekly free trial3 Days trial$4.997 Days
  • Monthly subscriptions$5.991 Month
Show 4 more
  • Bubble Level Pro3 Days trial$5.991 Month
  • 3 month3 Days trial$7.993 Months
  • 1 Year no free trial$19.991 Year
  • 1 Year3 Days trial$19.991 Year
One-time1
  • Remove Ads$0.99
1 purchases

Protractor+

One-time1
  • Pro Features$1.99

Questions

Is Bubble Level for iPhone free?
Bubble Level for iPhone is free to download, with in-app purchases available.
Is Protractor+ free?
Protractor+ is free to download, with in-app purchases available.
Which has better reviews, Bubble Level for iPhone or Protractor+?
Bubble Level for iPhone is rated higher. Bubble Level for iPhone averages 4.6 out of 5 from 112K ratings, while Protractor+ averages 4.1 from 10K ratings.
Do Bubble Level for iPhone or Protractor+ have ads?
Bubble Level for iPhone shows ads; Protractor+ does not.
Which is updated more often, Bubble Level for iPhone or Protractor+?
Bubble Level for iPhone ships an update every 5 weeks, and Protractor+ every 2 months. Most recently, Bubble Level for iPhone was updated on September 24, 2026 and Protractor+ on September 22, 2026.

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