# ThinkDriver vs KDIAG

The clearest difference is rating: ThinkDriver at 4.5 against KDIAG's 3.4. ThinkDriver also leads on review sentiment (58% vs 33%) and ratings volume (270 vs 17). KDIAG's advantage is monetization model (free vs paid). On price, update cadence, 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.

ThinkDriver holds the better App Store score, 4.5 against 3.4. That said, the two scores are not equally well evidenced: ThinkDriver has 270 ratings behind it against 17, so its average is the more settled of the two. Written reviews point the same way: 58% of ThinkDriver's written reviews are positive against 33% of KDIAG's.

ThinkDriver ships an update monthly, KDIAG every 3 weeks. The most recent releases landed on September 19, 2026 and September 21, 2026 respectively.

## The numbers

| Metric | ThinkDriver | KDIAG |
| --- | --- | --- |
| Price | Free | Free |
| Rating | **[4.5 (270 ratings)](https://appshunter.io/ios/app/thinkdriver/id1502233364/reviews)** | [3.4 (17 ratings)](https://appshunter.io/ios/app/kdiag/id6450169808/reviews) |
| Number of ratings | **270** | 17 |
| Positive reviews | **57.6% of reviews** | 33.3% of reviews |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | Monthly | **Every 3 weeks** |
| Monetization | Paid | **Free** |
| Size | 325 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

### ThinkDriver

[App page](https://appshunter.io/ios/app/thinkdriver/id1502233364)

This diagnostic tool allows car owners to perform full system vehicle checks, going beyond standard OBDII functionality. It provides immediate insights into potential car issues, acting as a comprehensive helper for vehicle maintenance.

**Highlights:** Full system vehicle diagnostics, Advanced OBDII alternative, Immediate issue detection, DIY car maintenance helper

**Features:** macOS Compatibility

**In-app purchases:** none

**What reviewers like**

- 👍 Works like professionals
- 👍 Handy tool for car
- 👍 Versatile and helpful
- 👍 Great tools for car
- 👍 Easy to use

**What reviewers complain about**

- 😞 Pay again for lifetime access
- 😞 Terrible support, no response
- 😞 Useless device, keeps shutting down
- 😞 Scanner does not work
- 😞 Customer service unhelpful

**Reported bugs**

- Keeps shutting down during scan
- Scanner does not work
- Not working with 2022 subscription update
- Device won't work after getting a new phone
- Keeps asking to activate device, then pay again

**Requested features**

- Add payment with Apple Cash
- Install just a code scanner icon


### 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 ThinkDriver free?

ThinkDriver 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, ThinkDriver or KDIAG?

ThinkDriver is rated higher. ThinkDriver averages 4.5 out of 5 from 270 ratings, while KDIAG averages 3.4 from 17 ratings.

### Do ThinkDriver or KDIAG have ads?

Neither ThinkDriver nor KDIAG shows ads.

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

ThinkDriver ships an update monthly, and KDIAG every 3 weeks. Most recently, ThinkDriver was updated on September 19, 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.*