U vs Gyraline
Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.
U
Streamline your workflow by directly inputting measurements from calipers and micrometers. This application simplifies data collection for process control, making it easier to manage your measurements.
- Direct caliper data input
- Direct micrometer data input
- Process control functionality
- Easy data collection
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Easy process control by directly taking in caliper and micrometer data.
Gyraline
This app transforms your smartphone and a precision toolkit into a professional-grade wheel alignment machine. It offers fast, accurate measurements for total toe, camber, caster, and more, right in your garage. Ideal for enthusiasts and DIYers seeking precise vehicle alignment.
- Precision 4-wheel alignment
- Measure total toe (front & rear)
- Thrust line comparison
- Body centerline alignment
- Camber, caster, and Ackermann modes
- Live digital precision measurements
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Precision 4-Wheel Alignment, Reimagined Gyraline is a revolutionary, patent-pending alignment system that turns your smartphone and our precision toolkit into a professional-grade wheel alignment machine. Perform the fastest, most accurate 4-wheel alignment you’ve ever done, right in your own garage. Measure Like a Pro • Total Toe (Front & Rear): Instantly measure total toe across both axles. • Thrust Line Comparison: Verify front toe alignment relative to the rear axle’s thrust line. • Body Centerline Alignment: Check toe against the vehicle’s geometric centerline. • Camber Mode: Measure and adjust camber with live digital precision. • Caster Mode: Sweep caster accurately, without expensive shop hardware. • Ackermann Mode: Visualize steering geometry like never before. Why Gyraline Gyraline brings professional alignment accuracy to enthusiasts, racers, and commuters without the need for bulky alignment racks. Fast setup, clear visuals, and uncompromising precision all powered by your phone.
Screenshots
Verdict
The clearest difference is review sentiment: Gyraline at 60% against U's 0%. Gyraline also leads on rating (3.8 vs 3.0) and update cadence (fortnightly vs every 11 months). U's advantage is iOS requirement (11.0 vs 15.0). On price, ads, 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
Both are free to download. Neither carries in-app purchases, so what you see is what you pay.
Gyraline holds the better App Store score, 3.8 against 3.0. That said, the two scores are not equally well evidenced: Gyraline has 104 ratings behind it against 2, so its average is the more settled of the two. Written reviews point the same way: 0% of U's written reviews are positive against 60% of Gyraline's.
U ships an update every 11 months, Gyraline fortnightly. The most recent releases landed on November 3, 2026 and November 7, 2026 respectively.
| Parameter | U | Gyraline |
|---|---|---|
| Price | Free | Free |
| Rating | 3.0 (2 ratings) | 3.8 (104 ratings) — better |
| Positive reviews | 0.0% of reviews | 60.0% of reviews — better |
| Number of ratings | 2 | 104 — better |
| Update frequency | Every 11 months | Fortnightly — better |
| Ads | No | No |
| In-app purchases | No | No |
| Monetization | Free | Free |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Requires iOS | 11.0 — better | 15.0 |
| Further details — not scored | ||
| Size | 13 MB | 63 MB |
| Age rating | 4+ | 4+ |
| Developer | MITUTOYO CORPORATION | Mechly LLC |
Customer experience
U
Gyraline
Bugs and requests
U
Not enough reviews yet to summarise bugs or requests.
Gyraline
Reported bugs
16 issues- Inconsistent measurements
- App crashes
- Sensor axis reversed (G2)
- Accuracy defaults revert to 0.10°
- Camber tool unreliable
Show 11 moreShow fewer
- Manual/videos do not match current app design
- Front toe readings inaccurate after update
- Body align function removed for G1
- Surface profile percentage not visible
- Buggy app renders G2 unusable
- Previous update was better, new update makes it impossible to get accurate results
- G1 owners don't get vehicle spec access
- Body alignment of front toe removed
- Front toe readings inaccurate
- App requires refresh with red screen when moving to front wheel
- Inconsistent readings even after adjustments
Requested features
7 requests- Add caster to features
- Live measurements via Bluetooth sensors
- Separate toe-only section for quicker adjustments
- Self-calibration setting
- Vehicle spec database for G1 owners
Show 2 moreShow fewer
- Update tutorials to match current app version
- Dark mode text display fix
In-app purchases
U
No in-app purchases
Gyraline
No in-app purchases
