# U vs Gyraline

The clearest difference is review sentiment: Gyraline at 61% against U's 11%. Gyraline also leads on rating (3.8 vs 1.9) and update cadence (fortnightly vs every 4 months). U's advantage is monetization model (free with in-app purchases vs paid) and iOS requirement (8.0 vs 15.0). On price, ratings volume, ads and in-app purchases there is nothing between them.

Both are free to download. U sells 10 one-off in-app purchases and Gyraline sells 9 in-app purchases, starting at $7.99 per 7 days. Whichever you choose, the download price is not the number that matters.

Gyraline holds the better App Store score, 3.8 against 1.9. Both are backed by a comparable volume of ratings — 125 and 101 respectively. Written reviews point the same way: 11% of U's written reviews are positive against 61% of Gyraline's.

U ships an update every 4 months, Gyraline fortnightly. The most recent releases landed on October 23, 2026 and October 25, 2026 respectively.

## The numbers

| Metric | U | Gyraline |
| --- | --- | --- |
| Price | Free | Free |
| Rating | [1.9 (125 ratings)](https://appshunter.io/ios/app/u-scan/id614809289/reviews) | **[3.8 (101 ratings)](https://appshunter.io/ios/app/gyraline/id6450752768/reviews)** |
| Number of ratings | **125** | 101 |
| Positive reviews | 10.9% of reviews | **60.7% of reviews** |
| In-app purchases | Yes | Yes |
| Ads | No | No |
| Update frequency | Every 4 months | **Fortnightly** |
| Monetization | **Free with in-app purchases** | Paid |
| Size | 85 MB | 63 MB |
| Requires iOS | **8.0** | 15.0 |
| Devices | iPhone, iPod | **iPhone, iPad, iPod** |
| Age rating | 4+ | 4+ |
| Developer | [Service Solutions US LLC](https://appshunter.io/developer/799425953) | [Mechly LLC](https://appshunter.io/developer/1694760852) |

## What reviewers say

### U

[App page](https://appshunter.io/ios/app/u-scan/id614809289)

This app allows users to diagnose vehicle issues using their smartphone and a compatible adapter. It provides access to check engine, ABS, and airbag codes, along with definitions and potential solutions. Users can also view live data and clear diagnostic trouble codes.

**Highlights:** Read and erase OBD II codes, View live vehicle data, ABS and Airbag code access, Automatic vehicle identification, Vehicle history log, Powertrain enhanced data

**In-app purchases (10)**

| Purchase | Price | Billing |
| --- | --- | --- |
| ABS Codes and definitions for Single Vehicle | $5.99 | one-time |
| ABS Code Vehicle 2 | $5.99 | one-time |
| Live Data and Manufacturer Specific Codes Vehicle 1 | $7.99 | one-time |
| Airbag codes and definitions for vehicle 1 | $7.99 | one-time |
| CodeConnect Repair Solutions for a Vehicle | $12.99 | one-time |
| Live Data and Manufacturer Specific Codes All Makes | $15.99 | one-time |
| CodeConnect Repair Solutions 1 Vehicle Upgrade to All | $27.99 | one-time |
| ABS Codes and Definitions All Vehicles | $29.99 | one-time |
| CodeConnect Repair Solutions All Vehicles | $39.99 | one-time |
| Airbag Codes and Definitions for All Makes | $39.99 | one-time |

**What reviewers like**

- ✅ Works well once successfully connected and configured
- 📊 Provides useful diagnostic data and error code reading
- 🔧 Helpful for identifying vehicle issues and troubleshooting
- 📱 Good app functionality for tech-savvy users who understand setup
- 💰 Reasonable price point for a diagnostic tool

**What reviewers complain about**

- 🔌 Severe Bluetooth connectivity issues - frequent disconnections
- 🔄 Extremely difficult and unreliable pairing process
- ⚠️ False 'vehicle in motion' errors when car is stationary
- 🚫 Cannot use live data while vehicle is moving (post-update restriction)
- 🐛 Firmware updates frequently fail or brick the device

**Reported bugs**

- Bluetooth connection drops frequently and won't reconnect
- App fails to recognize connected Bluetooth device
- Firmware update process freezes and becomes unresponsive
- False motion detection errors preventing app operation
- VIN entry not working or not submitting to garage

**Requested features**

- Enable live data monitoring while vehicle is in motion
- Improve Bluetooth auto-detection and automatic connection
- Add support for Australian vehicle models (Holden, Ford)
- Expand vehicle compatibility beyond 2013 models
- Implement dark mode for app interface


### Gyraline

[App page](https://appshunter.io/ios/app/gyraline/id6450752768)

This app transforms your smartphone and a specialized toolkit into a professional-grade wheel alignment system. It enables fast, accurate 4-wheel alignments for enthusiasts and DIYers in their own garage, offering precise measurements for various alignment angles.

**Highlights:** Precision 4-wheel alignment, Measure total toe (front & rear), Thrust line comparison, Camber measurement and adjustment, Caster sweep, Ackermann visualization

**Features:** Vision Pro support

**In-app purchases (9)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Gyraline DIY One Week | $7.99 | per 7 days |
| Gyraline DIY One Month | $9.99 | per month |
| Quick Check Single Device | $99.99 | per month |
| Trial | Free | one-time |
| Single Token Purchase | $0.99 | one-time |
| Five Token Purchase | $3.99 | one-time |
| Weekend Pass | $5.99 | one-time |
| One Time Subscription | $69.99 | one-time |
| Gyraline Pro | $399.99 | one-time |

**What reviewers like**

- 👍 Great for DIY alignments
- 💰 Saves money on professional alignments
- 🚀 Quick and easy adjustments
- 🎯 Surprisingly accurate results
- 💡 Innovative tool for automotive enthusiasts

**What reviewers complain about**

- 🐛 Inconsistent measurements
- 🤔 Steep learning curve
- ⏳ Time-consuming process
- 🤷‍♂️ Confusing interface/instructions
- 🐛 App crashes/bugs

**Reported bugs**

- Inconsistent measurements
- App crashes
- Sensor axis reversed (G2)
- Accuracy defaults revert to 0.10°
- Camber tool unreliable

**Requested features**

- 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


## Frequently asked questions

### Is U free?

U is free to download, with in-app purchases available.

### Is Gyraline free?

Gyraline is free to download, with in-app purchases available.

### Which has better reviews, U or Gyraline?

Gyraline is rated higher. U averages 1.9 out of 5 from 125 ratings, while Gyraline averages 3.8 from 101 ratings.

### Do U or Gyraline have ads?

Neither U nor Gyraline shows ads.

### Which is updated more often, U or Gyraline?

U ships an update every 4 months, and Gyraline fortnightly. Most recently, U was updated on October 23, 2026 and Gyraline on October 25, 2026.

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*Compared by [AppsHunter](https://appshunter.io/) from daily US App Store data. Review summaries are generated from verbatim App Store reviews.*