KDIAG vs CAR OBD
Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.
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
Read full descriptionHide 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！
CAR OBD
This utility app helps users manage car keys by facilitating the matching of existing keys and the addition of new ones. It supports both single key additions and batch processing for multiple keys.
- Match car keys
- Add single car key
- Batch add multiple keys
- Supports iPhone and iPad
Read full descriptionHide full description
An App for matching car keys, adding one key or batchadding multiple keys
Screenshots
Verdict
The clearest difference is rating: CAR OBD at 5.0 against KDIAG's 3.3. CAR OBD also leads on iOS requirement (13 vs 17.0). KDIAG's advantage is in-app purchases (none vs 5) and review sentiment (31% vs 0%). On price, ads and device support 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. CAR OBD sells 5 one-off in-app purchases. KDIAG asks for nothing beyond the download.
CAR OBD holds the better App Store score, 5.0 against 3.3. That said, the two scores are not equally well evidenced: KDIAG has 20 ratings behind it against 1, so its average is the more settled of the two. Written reviews complicate that: 31% of KDIAG's written reviews are positive against 0% of CAR OBD's, so the app with the better star average is not the one people write more warmly about.
KDIAG ships an update fortnightly, CAR OBD every 6 weeks. The most recent releases landed on October 8, 2026 and October 20, 2026 respectively.
| Parameter | KDIAG | CAR OBD |
|---|---|---|
| Price | Free | Free |
| Rating | 3.3 (20 ratings) | 5.0 (1 ratings) — better |
| Positive reviews | 30.8% of reviews — better | 0.0% of reviews |
| Number of ratings | 20 — better | 1 |
| Update frequency | Fortnightly — better | Every 6 weeks |
| Ads | No | No |
| In-app purchases | No — better | Yes |
| Monetization | Free — better | Free with in-app purchases |
| Devices | iPhone, iPad | iPhone, iPad, iPod — better |
| Requires iOS | 17.0 | 13 — better |
| Further details — not scored | ||
| Size | 74 MB | 15 MB |
| Age rating | 4+ | 4+ |
| Developer | 祖策 谢 | Dongguan Shendu Research Intelligent Technology Co., Ltd. |
Customer experience
KDIAG
CAR OBD
In-app purchases
KDIAG
No in-app purchases
CAR OBD
- OBD number recharge One$3.00
- OBD number recharge Two$6.00
- OBD number recharge three$9.00
Show 2 moreShow fewer
- OBD number recharge four$12.00
- OBD number recharge five$15.00
