iCarScan vs KDIAG
Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.
iCarScan
Access professional-level automotive diagnostic functions, including reading and clearing fault codes, viewing live data, and performing special tests. Supports a wide range of vehicle manufacturers with automatic VIN recognition and one-key diagnosis. Generates detailed diagnostic reports for informed maintenance.
- OE-level professional functions
- Full OBD II diagnosis
- Support for 39+ manufacturers
- Automatic VIN reading
- One-key diagnosis
- Fault code interpretation
- Diagnostic report generation
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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.
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 review sentiment: KDIAG at 33% against iCarScan's 0%. KDIAG also leads on update cadence (every 3 weeks vs every 5 months). iCarScan's advantage is rating (3.8 vs 3.4) and iOS requirement (9.0 vs 17.0). On price, ratings volume, 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. Neither carries in-app purchases, so what you see is what you pay.
iCarScan holds the better App Store score, 3.8 against 3.4. Both are backed by a comparable volume of ratings — 14 and 17 respectively. Written reviews complicate that: 0% of iCarScan's written reviews are positive against 33% of KDIAG's, so the app with the better star average is not the one people write more warmly about.
iCarScan ships an update every 5 months, KDIAG every 3 weeks. The most recent releases landed on June 9, 2026 and September 21, 2026 respectively.
| Parameter | iCarScan | KDIAG |
|---|---|---|
| Price | Free | Free |
| Rating | 3.8 (14 ratings) — better | 3.4 (17 ratings) |
| Positive reviews | 0.0% of reviews | 33.3% of reviews — better |
| Number of ratings | 14 | 17 — better |
| Update frequency | Every 5 months | Every 3 weeks — better |
| Ads | No | No |
| In-app purchases | No | No |
| Monetization | Free | Free |
| Devices | iPhone, iPod | iPhone, iPad, iPod — better |
| Requires iOS | 9.0 — better | 17.0 |
| Further details — not scored | ||
| Size | 324 MB | 74 MB |
| Age rating | 17+ | 4+ |
| Developer | THINKCAR INC | 祖策 谢 |
Customer experience
iCarScan
KDIAG
In-app purchases
iCarScan
No in-app purchases
KDIAG
No in-app purchases
