Comparison

Advancer AD20 vs UJS OBD Pro

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

Head to head
About

Advancer AD20

This app connects to a smart OBD dongle to provide vehicle health checks, diagnosis, and real-time monitoring. It helps identify fault codes, analyze driving habits, and offers maintenance reminders for enhanced driving safety.

Highlights
  • OBD-II Diagnosis
  • In-depth system check
  • Live vehicle data monitoring
  • Maintenance light reset
  • Trip recorder
  • Driving habits analysis
Features
Read full description

Advancer Smart OBD Dongle (AD20/AD20 Pro) is a smart diagnosis terminal that communicates with your iOS devices via BT 5.0. With the Advancer app, AD20 provides services like vehicle health check, diagnosis, driving habits analysis for car owners. Help the vehicle owner to check at any time whether the vehicle is out of order, display the cause of the fault and maintenance suggestions, monitor the status of the vehicle in real time and alert the safety hazards early to ensure your driving safety 1)OBD-II Diagnosis Advancer AD20 can read and categorize the fault codes (DTCs) that storage inside the vehicle ECU via standard OBD-II protocols. 2)In-depth Check In-depth check function allows you to do thorough check on vehicle systems like engine, powertrain, brakes, steering, safety, infotainment and so on, which helps owners to know the health condition of the car clearly and provide safe and comfortable driving experience on travels. Note: In-depth check on all systems is only supported on AD20 Pro; AD20 supports in-depth check on engine only. 3)Live Data When the car is started, Advancer will provide and demonstrate detailed vehicle status like battery voltage, engine revolution speed, coolant temperature, engine load, fuel trimming and so on. This will help you to get the real-time working conditions of the car. 4)Maintenance Light Reset Reset the maintenance counter and turn off the maintenance light after finishing maintenance. For your driving safety, make sure you have followed the manual when doing maintenance to your own car. Note: Maintenance light is a reminder set by car manufacturer, which reminds drivers to do maintenances when needed. When the reminder is on, the car will show info on the dashboard screen, or simply shows a light. 5)Trip Recorder When driving, Advancer will record the index like average speed, fuel consumption, mileage, max engine revolution speed, max coolant temperature and shows them on the app. This will help you to know vehicle status and fuel consumption info on the entire trip. 6)Driving Habits Monitor With the G-sensors inside Advancer, all the sharp turns, emergency brakes and sudden accelerations will be recorded and shown on the app after analyzed. This function will provide data support if you are willing to improve your driving skills.

About

UJS OBD Pro

Features
Read full description

UJS OBD Pro is exclusively designed to support UJS ROCCO Pro, serving as a professional car diagnostic and real-time monitoring application. It supports full OBDIl/EOBD standard protocols and multi-system diagnostics for ABS, Engine, Transmission and Airbag (SRS). Connect your smartphone to the UJS OBD Pro device to unlock comprehensive vehicle management. Enjoy key features including fault code reading and clearing, real-time data monitoring, performance testing, deep system scanning, AI-powered insights, customizable reports, and detailed trip analysis. It also features high-speed data transmission capabilities, paired with outstanding low-power consumption and ultra-energy-saving performance, ensuring long-lasting use without excessive battery drain. Drivers' safety and customer satisfaction are our top priorities. That's why we offer our products at an affordable price with no subscriptions and no hidden costs—ever. Every UJS diagnostic tool includes lifetime free updates and ongoing technical support, ensuring your device stays accurate and reliable for years to come. UJS OBD Pro offers multi-language support, including English, Español, Русский, 日本語,and 中文,ensuring seamless usability for users worldwide. Caution: 1. This app only supports adapters compatible with Bluetooth 5.1. 2. Available parameters may vary depending on your vehicle, as they are defined by the vehicle’s control unit rather than the UJS OBD app. 3. UJS OBD Pro is specifically optimized for use with UJS series products (UJS ROCCO Pro); compatibility with other devices is not guaranteed.

Screenshots

Advancer AD203 screens
UJS OBD Pro4 screens

Verdict

The call

Advancer AD20 and UJS OBD Pro are too close to call on the numbers: across 6 compared parameters — price, update cadence, ads and in-app purchases among them — neither pulls far enough ahead to decide it. What separates them is feature set and interface, not measurable difference.

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

Both are free to download. Neither carries in-app purchases, so what you see is what you pay.

UpkeepUpdate frequency

Advancer AD20 ships an update monthly, UJS OBD Pro every 5 weeks. The most recent releases landed on October 12, 2026 and October 17, 2026 respectively.

ScorecardNo meaningful differences
Advancer AD20 versus UJS OBD Pro: the parameters behind the verdict, then further details
ParameterAdvancer AD20UJS OBD Pro
PriceFreeFree
Rating2.4 (62 ratings) — better—
Positive reviews13.9% of reviews—
Number of ratings62 — better—
Update frequencyMonthly — betterEvery 5 weeks
AdsNoNo
In-app purchasesNoNo
MonetizationFree—
DevicesiPhone, iPad, iPod — betteriPhone, iPod
Requires iOS12.0 — better13
Further details — not scored
Size496 MB148 MB
Age rating12+4+
Developer深圳市云伽未来智能技术有限公司UJS INC

Bugs and requests

Advancer AD20

Reported bugs

14 issues
  • Cannot connect to scanner
  • Scanner tied to another account
  • Account creation issues (invalid email)
  • Device stops working after registration
  • Login timeouts
Show 9 more
  • Connection timeouts
  • Pairing issues (only once)
  • App crashes after iOS updates
  • App not working after iOS updates
  • App doesn't connect after iOS updates
  • App opens to nothing
  • Cannot login or register
  • Stuck on login/registration screen
  • Issue launching app on mobile network

Requested features

8 requests
  • Add more languages, including Chinese
  • Improve information availability for various car models
  • Fix issues with iOS updates
  • Improve app layout and navigation
  • Increase text size and contrast
Show 3 more
  • Remember most recent fault scans
  • Remove unnecessary login requirements
  • Fix connection issues on mobile networks (4G/5G)

UJS OBD Pro

Not enough reviews yet to summarise bugs or requests.

In-app purchases

None

Advancer AD20

No in-app purchases

None

UJS OBD Pro

No in-app purchases

Questions

Is Advancer AD20 free?
Advancer AD20 is free to download, with no in-app purchases.
Is UJS OBD Pro free?
UJS OBD Pro is free to download, with no in-app purchases.
Do Advancer AD20 or UJS OBD Pro have ads?
Neither Advancer AD20 nor UJS OBD Pro shows ads.
Which is updated more often, Advancer AD20 or UJS OBD Pro?
Advancer AD20 ships an update monthly, and UJS OBD Pro every 5 weeks. Most recently, Advancer AD20 was updated on October 12, 2026 and UJS OBD Pro on October 17, 2026.

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