# ThinkCar vs KDIAG

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.

Both are free to download. Neither carries in-app purchases, so what you see is what you pay.

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.

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

## The numbers

| Metric | ThinkCar | KDIAG |
| --- | --- | --- |
| Price | Free | Free |
| Rating | [2.8 (49 ratings)](https://appshunter.io/ios/app/thinkcar/id1464847380/reviews) | **[3.3 (20 ratings)](https://appshunter.io/ios/app/kdiag/id6450169808/reviews)** |
| Number of ratings | **49** | 20 |
| Positive reviews | **36.7% of reviews** | 30.8% of reviews |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | Monthly | **Fortnightly** |
| Monetization | Free | Free |
| Size | 234 MB | 74 MB |
| Requires iOS | **9.0** | 17.0 |
| Devices | iPhone, iPod | iPhone, iPad |
| Age rating | 17+ | 4+ |
| Developer | [THINKCAR INC](https://appshunter.io/developer/1464847379) | [祖策 谢](https://appshunter.io/developer/983519195) |

## What reviewers say

### ThinkCar

[App page](https://appshunter.io/ios/app/thinkcar/id1464847380)

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