Comparison

Advancer AD20 vs KDIAG

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

KDIAG

This app offers comprehensive automotive fault detection and OBD functions for various car brands. It provides professional diagnostic services to quickly identify and resolve car issues, making driving safer and smoother for enthusiasts and professionals alike. The app supports 8 languages and is free to use.

Highlights
  • Comprehensive automotive fault detection
  • OBD functions
  • System fault diagnosis for mainstream brands
  • Free to use
  • Supports 8 languages
  • Professional diagnostic services
Features
Read full description

The "KDIAG" automotive diagnostic app will provide you with the most comprehensive automotive fault detection and OBD functions, supporting system fault diagnosis for various mainstream brand cars and providing free use. Whether you are a car enthusiast or a professional technician, you can easily use it. The app also supports 8 languages to meet the needs of users worldwide. The app provides professional automotive diagnostic services that can quickly identify and solve automotive faults. Whether you are at home or on the road, you can easily use our application to ensure that your car remains in optimal condition. Download and experience our car diagnostic app to make your driving safer and smoother! "KDIAG"汽车诊断APP将为您提供最全面的汽车故障检测和OBD功能,支持多种主流品牌汽车的系统故障诊断并免费提供使用,无论您是一位汽车爱好者或专业技师,都能轻松使用。App还支持8种语言,满足全球使用者的使用需求。App提供专业级的汽车诊断服务,能够快速识别和解决汽车故障。无论您是在家里还是在路上,都可以轻松使用我们的应用程式来确保您的汽车保持最佳状态。快来下载并体验我们的汽车诊断APP,让您的驾驶更加安全和顺畅!

Screenshots

Advancer AD203 screens
KDIAG4 screens

Verdict

The call

The clearest difference is rating: KDIAG at 3.3 against Advancer AD20's 2.4. KDIAG also leads on review sentiment (31% vs 14%). Advancer AD20's advantage is ratings volume (64 vs 20) and iOS requirement (12.0 vs 17.0). 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

CostPrice · In-app purchases · Ads · Monetization

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

ReceptionRating · Positive reviews · Number of ratings

KDIAG holds the better App Store score, 3.3 against 2.4. Both are backed by a comparable volume of ratings — 64 and 20 respectively. Written reviews point the same way: 14% of Advancer AD20's written reviews are positive against 31% of KDIAG's.

UpkeepUpdate frequency

Advancer AD20 ships an update monthly, KDIAG fortnightly. The most recent releases landed on October 23, 2026 and October 24, 2026 respectively.

Scorecard4 real differences · 6 level
Advancer AD20 versus KDIAG: the parameters behind the verdict, then further details
ParameterAdvancer AD20KDIAG
PriceFreeFree
Rating2.4 (64 ratings)3.3 (20 ratings) — better
Positive reviews13.9% of reviews30.8% of reviews — better
Number of ratings64 — better20
Update frequencyMonthlyFortnightly — better
AdsNoNo
In-app purchasesNoNo
MonetizationFreeFree
DevicesiPhone, iPad, iPod — betteriPhone, iPad
Requires iOS12.0 — better17.0
Further details — not scored
Size496 MB74 MB
Age rating12+4+
Developer深圳市云伽未来智能技术有限公司祖策 谢

Customer experience

Advancer AD20

All ratings61 ratings
Positive29.5%
Neutral8.2%
Negative62.3%
Written reviews36 reviews
Positive13.9%
Neutral11.1%
Negative75.0%

KDIAG

All ratings20 ratings
Positive55.0%
Neutral10.0%
Negative35.0%
Written reviews13 reviews
Positive30.8%
Neutral23.1%
Negative46.2%

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)

KDIAG

Not enough reviews yet to summarise bugs or requests.

In-app purchases

None

Advancer AD20

No in-app purchases

None

KDIAG

No in-app purchases

Questions

Is Advancer AD20 free?
Advancer AD20 is free to download, with no in-app purchases.
Is KDIAG free?
KDIAG is free to download, with no in-app purchases.
Which has better reviews, Advancer AD20 or KDIAG?
KDIAG is rated higher. Advancer AD20 averages 2.4 out of 5 from 64 ratings, while KDIAG averages 3.3 from 20 ratings.
Do Advancer AD20 or KDIAG have ads?
Neither Advancer AD20 nor KDIAG shows ads.
Which is updated more often, Advancer AD20 or KDIAG?
Advancer AD20 ships an update monthly, and KDIAG fortnightly. Most recently, Advancer AD20 was updated on October 23, 2026 and KDIAG on October 24, 2026.

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