ThinkCar pro vs KDIAG
Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.
ThinkCar pro
This app provides professional-level vehicle diagnostics, including reading and clearing fault codes, accessing data streams, and performing special functions. It supports a wide range of car manufacturers and offers features like automatic VIN reading and report generation. Connect with other users in the community for support.
- OE-level professional functions
- Full OBD II diagnosis
- Maintenance light reset
- Support for 39+ manufacturers
- Automatic VIN reading
- Fault code interpretation
- Diagnostic report generation
- User community
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1. Profession functions refer to OE level functions, such as read/clear code, data flow diagram, read ECU, drive test, bidirectional special functions, etc. 2. Support full-function OBD II diagnosis, read data flow, freeze frame read IM/real-time data, read/clear fault code, vehicle on-board monitoring/computer system control operation and read vehicle information. 3. Support vehicle maintenance light return to normal. 4. Select any vehicle diagnostic software, covering up to 39 major automobile manufacturers. 5. Support automatic VIN reading and one-key diagnosis. 6. Clear interpretation of fault codes and generate professional diagnostic reports. 7. Be able to communicate with other users within the ThinkDiag community (share/help/support).
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.
- Comprehensive automotive fault detection
- OBD functions
- System fault diagnosis for mainstream brands
- Free to use
- Supports 8 languages
- Professional diagnostic services
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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
Verdict
The clearest difference is rating: ThinkCar pro at 4.6 against KDIAG's 3.3. ThinkCar pro also leads on review sentiment (62% vs 31%) and ratings volume (379 vs 20). KDIAG's advantage is update cadence (fortnightly vs every 5 months). On price, ads, in-app purchases and monetization model 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. Neither carries in-app purchases, so what you see is what you pay.
ThinkCar pro holds the better App Store score, 4.6 against 3.3. That said, the two scores are not equally well evidenced: ThinkCar pro has 379 ratings behind it against 20, so its average is the more settled of the two. Written reviews point the same way: 62% of ThinkCar pro's written reviews are positive against 31% of KDIAG's.
ThinkCar pro ships an update every 5 months, KDIAG fortnightly. The most recent releases landed on November 7, 2026 and November 3, 2026 respectively.
| Parameter | ThinkCar pro | KDIAG |
|---|---|---|
| Price | Free | Free |
| Rating | 4.6 (379 ratings) — better | 3.3 (20 ratings) |
| Positive reviews | 61.7% of reviews — better | 30.8% of reviews |
| Number of ratings | 379 — better | 20 |
| Update frequency | Every 5 months | Fortnightly — better |
| Ads | No | No |
| In-app purchases | No | No |
| Monetization | Free | Free |
| Devices | iPhone, iPod | iPhone, iPad |
| Requires iOS | 9.0 — better | 17.0 |
| Further details — not scored | ||
| Size | 325 MB | 74 MB |
| Age rating | 17+ | 4+ |
| Developer | THINKCAR INC | 祖策 谢 |
Customer experience
ThinkCar pro
KDIAG
Bugs and requests
ThinkCar pro
Reported bugs
9 issues- App crashes and resets unexpectedly
- TPMS functionality not working
- Password registration issues
- Slow app loading times
- Graphs not rendering in engine parameters
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- OBD2 value reading failures
- Firmware update failures
- ABS bleeding process extremely slow
- App crashes after updates
Requested features
7 requests- PDF export and sharing functionality
- Multiple parameters on single graph
- Data export for external analysis
- Support for LPG/LPI fuel vehicles
- Support for VAZ vehicles
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- Automatic VIN identification
- Improved app stability and performance
KDIAG
Not enough reviews yet to summarise bugs or requests.
In-app purchases
ThinkCar pro
No in-app purchases
KDIAG
No in-app purchases
