Comparison

Bubble Level Tool 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 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.

Highlights
  • Measure current device angle
  • Reset angle
  • Lock angle
  • Portrait mode
  • Landscape mode
  • Surface level
Read full description

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.

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 Level Tool4 screens
StringAlignPro4 screens

Verdict

The call

The clearest difference is price: Bubble Level Tool at Free against StringAlignPro's $9.99. Bubble Level Tool also leads on update cadence (weekly vs every 2 weeks). StringAlignPro's advantage is in-app purchases (none vs 9). On ads, 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 Tool is free to download; StringAlignPro costs $9.99 up front. Bubble Level Tool sells 9 in-app purchases, starting at $3.99 per 7 days. StringAlignPro asks for nothing beyond the download.

UpkeepUpdate frequency

Bubble Level Tool ships an update weekly, StringAlignPro every 2 weeks. The most recent releases landed on October 10, 2026 and September 21, 2026 respectively.

Scorecard3 real differences · 7 level
Bubble Level Tool versus StringAlignPro: the parameters behind the verdict, then further details
ParameterBubble Level ToolStringAlignPro
PriceFree — better$9.99
Rating4.4 (2.5K ratings) — better—
Positive reviews6.0% of reviews—
Number of ratings2.5K — better—
Update frequencyWeekly — betterEvery 2 weeks
AdsNoNo
In-app purchasesYesNo — better
MonetizationSubscription—
DevicesiPhone, iPodiPhone, iPad, iPod — better
Requires iOS15.015.0
Further details — not scored
Size5 MB2 MB
Age rating4+4+
DeveloperRihab MehboobRaceTracs Ltd

Bugs and requests

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

StringAlignPro

Not enough reviews yet to summarise bugs or requests.

In-app purchases

9 purchases

Bubble Level Tool

Subscriptions7
  • Bubble 1 Week$3.997 Days
  • Bubble 1 Week$4.997 Days
  • Bubble 1 Month3 Days trial$5.991 Month
Show 4 more
  • 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
One-time2
  • Bubble Lifetime$17.99
  • Bubble Lifetime$69.99
None

StringAlignPro

No in-app purchases

Questions

Is Bubble Level Tool free?
Bubble Level Tool is free to download, with in-app purchases available.
Is StringAlignPro free?
StringAlignPro costs $9.99, with no in-app purchases.
Do Bubble Level Tool or StringAlignPro have ads?
Neither Bubble Level Tool nor StringAlignPro shows ads.
Which is updated more often, Bubble Level Tool or StringAlignPro?
Bubble Level Tool ships an update weekly, and StringAlignPro every 2 weeks. Most recently, Bubble Level Tool was updated on October 10, 2026 and StringAlignPro on September 21, 2026.

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