# iCarScan vs KDIAG

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.

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.

## The numbers

| Metric | iCarScan | KDIAG |
| --- | --- | --- |
| Price | Free | Free |
| Rating | **[3.8 (14 ratings)](https://appshunter.io/ios/app/icarscan/id1508699839/reviews)** | [3.4 (17 ratings)](https://appshunter.io/ios/app/kdiag/id6450169808/reviews) |
| Number of ratings | 14 | **17** |
| Positive reviews | 0.0% of reviews | **33.3% of reviews** |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | Every 5 months | **Every 3 weeks** |
| Monetization | Free | Free |
| Size | 324 MB | 74 MB |
| Requires iOS | **9.0** | 17.0 |
| Devices | iPhone, iPod | **iPhone, iPad, iPod** |
| Age rating | 17+ | 4+ |
| Developer | [THINKCAR INC](https://appshunter.io/developer/1464847379) | [祖策 谢](https://appshunter.io/developer/983519195) |

## What reviewers say

### iCarScan

[App page](https://appshunter.io/ios/app/icarscan/id1508699839)

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.

**Highlights:** OE-level professional functions, Full OBD II diagnosis, Support for 39+ manufacturers, Automatic VIN reading, One-key diagnosis, Fault code interpretation, Diagnostic report generation

**Features:** macOS Compatibility

**In-app purchases:** none


### KDIAG

[App page](https://appshunter.io/ios/app/kdiag/id6450169808)

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:** macOS Compatibility, Vision Pro support

**In-app purchases:** none


## Frequently asked questions

### Is iCarScan free?

iCarScan 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, iCarScan or KDIAG?

iCarScan is rated higher. iCarScan averages 3.8 out of 5 from 14 ratings, while KDIAG averages 3.4 from 17 ratings.

### Do iCarScan or KDIAG have ads?

Neither iCarScan nor KDIAG shows ads.

### Which is updated more often, iCarScan or KDIAG?

iCarScan ships an update every 5 months, and KDIAG every 3 weeks. Most recently, iCarScan was updated on June 9, 2026 and KDIAG on September 21, 2026.

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*Compared by [AppsHunter](https://appshunter.io/) from daily US App Store data. Review summaries are generated from verbatim App Store reviews.*