Comparison

ThinkCar vs KDIAG

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

Head to head
About

ThinkCar

This app connects to a compatible OBD2 scan tool to diagnose vehicle issues and provide detailed health reports. It offers real-time data, full system inspections, and a community forum for car enthusiasts and mechanics.

Highlights
  • Real-time vehicle data dashboard
  • Full OBD2 functions (10 modes)
  • Enhanced full vehicle systems inspection
  • OBD2 data recording (Black Box)
  • Online community for car enthusiasts
Features
Read full description

Scan to know your vehicle and say goodbye to unknown check engine lights! (ThinkCar1 or 1S is required.) Nowadays vehicle repair and maintenance is expensive. You need a premium powerful scan tool which you can trust. Thinkcar is a professional OBD2 scan tool which provides full OBD functions and enhanced full vehicle modules health report. It also featured with premium functions like Real-Time Remote Diagnostic, vehicle Black Box (OBD data recording) and Online Community. Those unique premium features will bring your scan experience to next level. Our Thinkcar APP is free for installation. Thinkcar adapter will read vehicle data through OBD2 port, and transfer them to Thinkcar App via Bluetooth for review. We apply same diagnostic technology from Launch Tech, which is the world leader in vehicle diagnostic industry, **Features(ThinkCar1 or 1S is required.) 1. Real-time dashboard Vehicle useful data will be displayed in the form of meters and graphs on the phone to show the vehicle status, which is vivid, professional and clear at a glance. 2. Powerful diagnostic and inspection functions 2-1 Full OBD2 functions (10 modes): • Read trouble code • Clear trouble code • I/M Readiness / SMOG check • Multi data stream (PIDs) graphing • Freeze frame data • Mode 6 (On-Board Monitoring Test Results) • Oxygen sensor monitoring 2-2 Enhanced full vehicle systems inspection, one-key clear code: Enhanced full vehicle inspection will scan all vehicle modules including engine, transmission, ABS, SRS, TPMS and more. Wide coverage which nobody can match, Acura, Alfa Romeo, Audi, Bentley, BMW, Bugatti, Buick, Cadillac, Chevrolet, Chrysler, Dodge, Fiat, Ford, GMC, Honda, Hyundai, Infiniti, Jaguar, Jeep, Kia, Lamborghini, Lancia, Land Rover, Lexus, Lincoln, Maybach, Mazda, Mercedes Benz, Mercury, MINI, Mitsubishi, Nissan, Opel, Peugeot, Pontiac, Ram, Rolls Royce, Saturn, Toyota, Volkswagen, Volvo. Once scan is completed, will generate a certified vehicle health report by Thinkcar. The report contains details of all systems of the vehicle. If there is something wrong of the vehicle, the report will have a detailed fault description, so that you will know about the cause of the fault and perform needed maintenance and repair. 2-3 Black box (OBD2 data recording) Thinkcar can record OBD2 live data while the vehicle is running, so technicians can play back/review saved data to find the faults quickly and easily. 3. Online community: Thinkcar App offers a social media platform for vehicle owners, DIYers, professional mechanics to share useful tips and get help from others. On our community, there are tremendous useful tips, fun pictures and videos waiting for you to discover. No purchase is needed to visit our community, just simply download/install our Thinkcar App and register an account. JOIN US TODAY!

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

ThinkCar4 screens
KDIAG4 screens

Verdict

The call

The clearest difference is rating: KDIAG at 3.3 against ThinkCar's 2.8. ThinkCar's advantage is iOS requirement (9.0 vs 17.0). On price, review sentiment, ratings volume and update cadence 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 2.8. Both are backed by a comparable volume of ratings — 49 and 20 respectively. Written reviews complicate that: 37% of ThinkCar's written reviews are positive against 31% of KDIAG's, so the app with the better star average is not the one people write more warmly about.

UpkeepUpdate frequency

ThinkCar ships an update monthly, KDIAG fortnightly. The most recent releases landed on October 21, 2026 and October 24, 2026 respectively.

Scorecard2 real differences · 8 level
ThinkCar versus KDIAG: the parameters behind the verdict, then further details
ParameterThinkCarKDIAG
PriceFreeFree
Rating2.8 (49 ratings)3.3 (20 ratings) — better
Positive reviews36.7% of reviews — better30.8% of reviews
Number of ratings49 — better20
Update frequencyMonthlyFortnightly — better
AdsNoNo
In-app purchasesNoNo
MonetizationFreeFree
DevicesiPhone, iPodiPhone, iPad
Requires iOS9.0 — better17.0
Further details — not scored
Size234 MB74 MB
Age rating17+4+
DeveloperTHINKCAR INC祖策 谢

Customer experience

ThinkCar

All ratings49 ratings
Positive40.8%
Neutral8.2%
Negative51.0%
Written reviews30 reviews
Positive36.7%
Neutral10.0%
Negative53.3%

KDIAG

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

In-app purchases

None

ThinkCar

No in-app purchases

None

KDIAG

No in-app purchases

Questions

Is ThinkCar free?
ThinkCar 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, ThinkCar or KDIAG?
KDIAG is rated higher. ThinkCar averages 2.8 out of 5 from 49 ratings, while KDIAG averages 3.3 from 20 ratings.
Do ThinkCar or KDIAG have ads?
Neither ThinkCar nor KDIAG shows ads.
Which is updated more often, ThinkCar or KDIAG?
ThinkCar ships an update monthly, and KDIAG fortnightly. Most recently, ThinkCar was updated on October 21, 2026 and KDIAG on October 24, 2026.

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