Comparison

Bubble Level vs StringAlignPro

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

Head to head
About

Bubble Level

This app transforms your phone into a precise leveling tool. It offers accurate angle measurement, inclination detection, and augmented reality features for DIY and professional use. Calibration is simple and quick.

Highlights
  • Ultra-precise angle measurement
  • Inclination and slope meter
  • Augmented reality ruler and protractor
  • Effortless one-touch calibration
  • Clear and easy-to-read display
  • User-friendly interface
Features
Read full description

Transform Your Phone into a Precision Leveling Tool! Over 450K users - 4.5 Star Average Rating Introducing the Super-Easy Level: Turn your device into a highly accurate bubble level (spirit level) with ease. Ideal for both DIY aficionados and professional builders, our app delivers unparalleled precision for any leveling task. Why Choose Super-Easy Level? Versatile Measurement Tools: Not only can you check the level and inclination of surfaces, but with our camera integration, measuring lengths becomes a breeze. Augmented Reality Features: Equipped with an augmented reality ruler and protractor for cutting-edge measurement accuracy. Simplicity at Its Best: Enjoy a user-friendly interface that makes navigation a piece of cake on any smartphone or tablet. Now on Apple Watch: Angle measurements appear live on your wrist. The Watch app mirrors your iPhone's mode and accent color in real time. In 1D mode, a full-screen artificial horizon tilts with your measured angle — choose degrees, slope %, or near-delta. In 2D mode, a dual-axis crosshair with a yaw compass ring tracks tilt on both axes simultaneously. Lock readings or save angles directly from your Watch; the last reading stays on screen even if the iPhone connection drops. Key Features: Ultra-Precise: Measures angles to the nearest tenth of a degree. Effortless Calibration: Simple one-touch calibration keeps accuracy at your fingertips. Clear Visual Display: Our interface is designed for clarity, ensuring your measurements are easy to read at a glance. Robust Toolset: Whether it's a quick DIY project or a professional job, our app is up to the task. Get Started in Seconds: Align your phone with a known level or vertical edge. Press the calibration button. Done! Elevate your DIY and professional projects with Super-Easy Level — download now and level up your precision game! Features: ◉ Accurate measuring to one tenth of a degree. ◉ Super easy angle calibration and handling. ◉ Precise and reliable measurements ◉ Ability to measure inclination/slope ◉ Easy to read display ◉ Calibration function for even more accurate results ◉ User-friendly interface and can be used on any smartphone or tablet. ◉ Apple Watch support — live angle readings, lock & save from your wrist. How to calibrate: ◉ Align the phone with a level or vertical edge and hit the calibration button. ◉ That's it. Terms of use (EULA): https://www.apple.com/legal/internet-services/itunes/dev/stdeula/

About

StringAlignPro

Features
Read full description

String Align Pro turns the proven string-box method into a fast, accurate alignment tool you can use right at the car — no laptop, no rig, no internet. Enter the distances you measure from the string to the front and rear of each rim, and String Align Pro does the geometry for you: per-wheel toe, total toe per axle, and the rear thrust angle relative to the car's chassis centreline. Because it works from the centreline, it reveals crabbing that front-and-rear-only numbers can hide — so the car runs true, not just "aligned." KEY FEATURES - Toe, total toe and thrust angle, calculated from simple rim measurements - Thrust angle referenced to the chassis centreline - Camber recorded per corner - Work in your units: enter distances in millimetres or inches; read toe in mm, inches or degrees - Before & After: capture a baseline, make changes, compare side by side - Clean PDF reports in your chosen units — for the car's file or the customer - Save jobs by name and reopen them any time - Fully offline — everything runs and stays on your device - No account, no sign-up, no tracking - Universal: works on iPhone and iPad BUILT FOR THE PADDOCK Whether you're setting up a track-day car in the garage or making changes between sessions, String Align Pro keeps the numbers you act on the same as the numbers you measured — and keeps a record you can share. IMPORTANT String Align Pro provides guidance based on the measurements you enter. Always verify your inputs and check results against your own engineering judgement and the vehicle manufacturer's specification. Wheel alignment affects vehicle handling and safety — setup decisions are yours. Published by RaceTracs Ltd.

Screenshots

Bubble Level4 screens
StringAlignPro4 screens

Verdict

The call

The clearest difference is price: Bubble Level at Free against StringAlignPro's $9.99. Bubble Level also leads on update cadence (weekly vs every 2 weeks). StringAlignPro's advantage is in-app purchases (none vs 11) and ads (none vs shown). On device support and iOS requirement 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

Bubble Level is free to download; StringAlignPro costs $9.99 up front. Bubble Level sells 11 in-app purchases, starting at $1.99 per 7 days. StringAlignPro asks for nothing beyond the download.

UpkeepUpdate frequency

Bubble Level ships an update weekly, StringAlignPro every 2 weeks. The most recent releases landed on October 7, 2026 and September 21, 2026 respectively.

Scorecard4 real differences · 6 level
Bubble Level versus StringAlignPro: the parameters behind the verdict, then further details
ParameterBubble LevelStringAlignPro
PriceFree — better$9.99
Rating4.5 (702 ratings) — better—
Positive reviews41.4% of reviews—
Number of ratings702 — better—
Update frequencyWeekly — betterEvery 2 weeks
AdsYesNo — better
In-app purchasesYesNo — better
MonetizationFree with in-app purchases—
DevicesiPhone, iPad, Apple WatchiPhone, iPad, iPod
Requires iOS16.615.0 — better
Further details — not scored
Size43 MB2 MB
Age rating4+4+
DeveloperJens RieckhofRaceTracs Ltd

Bugs and requests

Bubble Level

Reported bugs

2 issues
  • App crashes on launch
  • Measurement point behaves erratically

Requested features

2 requests
  • Ability to calibrate the app
  • Option to change the display color

StringAlignPro

Not enough reviews yet to summarise bugs or requests.

In-app purchases

11 purchases

Bubble Level

Subscriptions6
  • Premium - Weekly Plan$1.997 Days
  • Spirit Level Premium – Monthly$2.991 Month
  • Bubble Level Premium - Weekly$2.997 Days
Show 3 more
  • Bubble Level Premium - Monthly$5.991 Month
  • Spirit Level Premium – Annual7 Days trial$14.991 Year
  • Bubble Level Premium - Annual7 Days trial$19.991 Year
One-time5
  • All features - No ads$1.99
  • Unlock all AR features$5.99
  • Discount Lifetime Premium$14.99
Show 2 more
  • Bubble Level PREMIUM Lifetime$19.99
  • Bubble Level - Lifetime Premium$29.99
None

StringAlignPro

No in-app purchases

Questions

Is Bubble Level free?
Bubble Level is free to download, with in-app purchases available.
Is StringAlignPro free?
StringAlignPro costs $9.99, with no in-app purchases.
Do Bubble Level or StringAlignPro have ads?
Bubble Level shows ads; StringAlignPro does not.
Which is updated more often, Bubble Level or StringAlignPro?
Bubble Level ships an update weekly, and StringAlignPro every 2 weeks. Most recently, Bubble Level was updated on October 7, 2026 and StringAlignPro on September 21, 2026.

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