U vs MaxiAP Diag
Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.
U
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.
- Read and erase OBD II codes
- View live vehicle data
- ABS and Airbag code access
- Automatic vehicle identification
- Vehicle history log
- Powertrain enhanced data
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U-Scan provides DIYers and Professional Technicians with access to vehicle diagnostics using their smartphone when paired to the available U-Scan vehicle adapter. Developed by the Global leader in DIY and professional diagnostic scan tools. U-Scan provides essential information to diagnose vehicles fast while saving money. •Get the probable solution to a check engine, ABS, or Airbag light. Simply connect the adapter to the vehicle and pair with your smartphone to start the diagnostic process. •QuickCheck™ - Review vehicle emissions status (I/M Monitors, Codes). •Read Codes - Read Global OBD II codes and display the definition. •Erase Codes - Erase Global OBD II codes. •AutoID™ - Automatically identifies most 2000 and newer vehicles for error proof diagnostics. •TrueLink™ - U-Scan will link to all 1996 and newer vehicles. •MyGarage™ - Library of all previous diagnosed vehicles. •Vehicle Activity Log – Detailed history of your U-Scan activities. •Screen shot sharing via Facebook and email •Optional App Enhancements - For access to more advanced diagnostic capabilities. Powertrain Enhanced Data •Get access to Powertrain codes and definitions related to the check engine light for most 1996 and newer GM, Ford, Chrysler, Honda, Hyundai, Nissan and Toyota vehicles via the manufacturer specific Read Codes Powertrain diagnostic commands. •Manufacturer specific code definitions for GM, Ford, Chrysler, Toyota, Honda, Nissan, Hyundai, Audi, BMW, Daewoo, Isuzu, Jaguar, Kia, Land Rover, Mazda, Mercedes Benz, Mitsubishi, Porsche, Saab, Subaru, Suzuki, Volkswagen, and Volvo. •Freeze Frame data - Details the conditions of the vehicle at the time the trouble code was set. •View and Graph LIVE Data - View RPMs, coolant temperature, oxygen sensor readings and more for a faster diagnosis. Over 300 sensor and data items are available as supported by vehicle. •Unlock CodeConnect™ and access the most likely cause of the check engine light. Get manufacturer specific powertrain DTC fixes. (If CodeConnect™ is owned.) • Enable manufacturer specific Erase Codes Powertrain diagnostic commands. Optional App Enhancements include: ABS Codes and Definitions - $5.99 per vehicle or $29.99 all manufacturers listed below •Get access to the ABS brake codes and definitions related to the ABS warning light for most 1996 and newer GM, Ford, Chrysler, Honda, Hyundai, Nissan and Toyota vehicles via the manufacturer specific Read Codes ABS diagnostic command. •Unlock CodeConnect™ ABS fixes and access the most likely cause of the ABS warning light (If CodeConnect™ is owned.) • Enable manufacturer specific Erase Codes ABS diagnostic command. Airbag Codes and Definitions - $7.99 per vehicle or $39.99 all manufacturers listed below •Get access to the Airbag codes and definitions related to the Airbag warning light for most 1996 and newer GM, Ford, Chrysler, Honda, Nissan and Toyota vehicles via the manufacturer specific Read Codes Airbag diagnostic commands. •Unlock CodeConnect™ Airbag fixes and access the most likely cause of the Airbag warning light (If CodeConnect™ is owned.) • Enable manufacturer specific Erase Codes Airbag diagnostic commands. CodeConnect™- First vehicle included free with purchase of adapter. Additional vehicles access $12.99 per vehicle or $39.99 all vehicles •Get the next step in diagnosing your vehicle. Access over 4.3 Million Fixes that tell you what is wrong with your vehicle with CodeConnect™. CodeConnect™ is a comprehensive database of over 4.3 million verified fixes for the trouble codes that cause the check engine and ABS warning lights to illuminate. These actual vehicle fixes have been reported and then verified by our team of ASE certified technicians. •Note: You must purchase Powertrain Enhanced Data and/or ABS Codes and Definitions to access respective CodeConnect coverage for manufacture specific Powertrain and ABS warning lights
MaxiAP Diag
This management app helps DIY vehicle owners with repairs, maintenance, and customization. It offers diagnostic insights, common dashboard light explanations, and service functions for various car models. Monitor your vehicle's health and access repair shop information.
- Enhanced system diagnostics
- OBDII test (read/erase codes, live data)
- Auto VIN vehicle identification
- Vehicle health monitoring
- DIY service functions (oil reset, TPMS)
- EV/Hybrid battery testing
- Common dashboard light guide
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MaxiAP Diag is a management application designed to meet the simple repair, maintenance, and customization needs of DIY vehicle owners. As a next-generation DIY diagnostic tool, it is dedicated to providing C-end users with insights into vehicle conditions and diagnostic recommendations. Additionally, features such as common dashboard lights, Technical Service Bulletins (TSBs), and 100km acceleration test have been added based on personalized customer demands, further enhancing user understanding of the vehicle's condition. 1. Comprehensive support for enhanced system diagnostics of internationally recognized car models. 2. Provides OBDII test, including the ability to read and erase codes, emissions results, view freeze frame and live data. 3. Supports late model vehicles using faster CANFD communications. 4. Quick vehicle identification with Auto VIN. Store and quickly access past records, and diagnostic reports. 5. Complete monitoring of vehicle health, including engine oil life, average fuel consumption, and brake pad life. 6. Supports commonly performed DIY service functions, such as oil reset, TPMS relearn, battery registration, and wipers replacement. 7. Test hybrid and electric vehicle power battery. Assess battery State of Charge (SoC), State of Health (SoH), and recharge mileage. Provides battery maintenance reminders. 8. Provides additional features tailored to the needs of DIY users, such as Find a Local Repair Shop function and Common Dashboard Lights, etc.
Screenshots
Verdict
The clearest difference is rating: MaxiAP Diag at 2.9 against U's 1.9. U's advantage is ratings volume (125 vs 10) and review sentiment (11% vs 0%). On price, update cadence, ads and in-app purchases 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. U sells 10 one-off in-app purchases and MaxiAP Diag sells 28 one-off in-app purchases. Whichever you choose, the download price is not the number that matters.
MaxiAP Diag holds the better App Store score, 2.9 against 1.9. That said, the two scores are not equally well evidenced: U has 125 ratings behind it against 10, so its average is the more settled of the two. Written reviews complicate that: 11% of U's written reviews are positive against 0% of MaxiAP Diag's, so the app with the better star average is not the one people write more warmly about.
U ships an update every 4 months, MaxiAP Diag every 5 months. The most recent releases landed on October 21, 2026 and October 20, 2026 respectively.
| Parameter | U | MaxiAP Diag |
|---|---|---|
| Price | Free | Free |
| Rating | 1.9 (125 ratings) | 2.9 (10 ratings) — better |
| Positive reviews | 10.9% of reviews — better | 0.0% of reviews |
| Number of ratings | 125 — better | 10 |
| Update frequency | Every 4 months — better | Every 5 months |
| Ads | No | No |
| In-app purchases | Yes | Yes |
| Monetization | Free with in-app purchases | Free with in-app purchases |
| Devices | iPhone, iPod | iPhone, iPod |
| Requires iOS | 8.0 — better | 13.0 |
| Further details — not scored | ||
| Size | 85 MB | 104 MB |
| Age rating | 4+ | 4+ |
| Developer | Service Solutions US LLC | Autel Intelligent Technology Co., Ltd. |
Customer experience
U
MaxiAP Diag
Bugs and requests
U
Reported bugs
15 issues- 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
Show 10 moreShow fewer
- App crashes during scanning or data retrieval
- Device won't pair after firmware update
- App takes 2+ minutes to recognize connected device
- Bluetooth pairing requires manual connection in settings
- Vehicle module detection fails or shows incorrect modules
- App forces landscape mode without option to change
- Live data display limited to only two screens of information
- App won't function without mandatory vehicle garage entry
- Connection errors persist despite correct Bluetooth pairing
- App becomes unresponsive during update process
Requested features
10 requests- 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
Show 5 moreShow fewer
- Add customizable data display options
- Improve app responsiveness and reduce connection delay
- Provide comprehensive manual and troubleshooting guides
- Add support for more vehicle modules (ABS, airbag, transmission)
- Implement automatic firmware updates without user intervention
MaxiAP Diag
Not enough reviews yet to summarise bugs or requests.
In-app purchases
U
- ABS Codes and definitions for Single Vehicle$5.99
- ABS Code Vehicle 2$5.99
- Live Data and Manufacturer Specific Codes Vehicle 1$7.99
Show 7 moreShow fewer
- Airbag codes and definitions for vehicle 1$7.99
- CodeConnect Repair Solutions for a Vehicle$12.99
- Live Data and Manufacturer Specific Codes All Makes$15.99
- CodeConnect Repair Solutions 1 Vehicle Upgrade to All$27.99
- ABS Codes and Definitions All Vehicles$29.99
- CodeConnect Repair Solutions All Vehicles$39.99
- Airbag Codes and Definitions for All Makes$39.99
MaxiAP Diag
- Mazda for one year$21.99
- Mini for one year$21.99
- INFINITI for one year$21.99
Show 25 moreShow fewer
- Lamborghini for one year$21.99
- Mitsubishi for one year$21.99
- Cadillac for one year$21.99
- Chrysler for one year$21.99
- Scion for one year$21.99
- Subaru for one year$21.99
- GMC for one year$21.99
- Buick for one year$21.99
- Audi for one year$21.99
- Acura for one year$21.99
- Lexus for one year$21.99
- Volkswagen for one year$21.99
- Nissan for one year$21.99
- Ford for one year$21.99
- Honda for one year$21.99
- BMW for one year$21.99
- Chevrolet for one year$21.99
- Dodge for one year$21.99
- Hyundai for one year$21.99
- Jeep for one year$21.99
- Kia for one year$21.99
- Mercedes-Benz for one year$21.99
- Ram for one year$21.99
- Toyota for one year$21.99
- Volvo for one year$21.99








