# EasyDiag4 vs KDIAG

The clearest difference is rating: KDIAG at 3.4 against EasyDiag4's 2.9. KDIAG also leads on review sentiment (33% vs 0%) and update cadence (every 3 weeks vs every 18 months). EasyDiag4's advantage is iOS requirement (11.0 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.

KDIAG holds the better App Store score, 3.4 against 2.9. Both are backed by a comparable volume of ratings — 19 and 17 respectively. Written reviews point the same way: 0% of EasyDiag4's written reviews are positive against 33% of KDIAG's.

EasyDiag4 ships an update every 18 months, KDIAG every 3 weeks. The most recent releases landed on September 20, 2026 and September 21, 2026 respectively.

## The numbers

| Metric | EasyDiag4 | KDIAG |
| --- | --- | --- |
| Price | Free | Free |
| Rating | [2.9 (19 ratings)](https://appshunter.io/ios/app/easydiag4/id1505477232/reviews) | **[3.4 (17 ratings)](https://appshunter.io/ios/app/kdiag/id6450169808/reviews)** |
| Number of ratings | **19** | 17 |
| Positive reviews | 0.0% of reviews | **33.3% of reviews** |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | Every 18 months | **Every 3 weeks** |
| Monetization | Free | Free |
| Size | 114 MB | 74 MB |
| Requires iOS | **11.0** | 17.0 |
| Devices | iPhone, iPod | **iPhone, iPad, iPod** |
| Age rating | 17+ | 4+ |
| Developer | [Launch Tech Co., Ltd](https://appshunter.io/developer/447568418) | [祖策 谢](https://appshunter.io/developer/983519195) |

## What reviewers say

### EasyDiag4

[App page](https://appshunter.io/ios/app/easydiag4/id1505477232)

This application connects to your vehicle via Bluetooth to perform comprehensive fault diagnosis across various systems. It supports reading and clearing diagnostic trouble codes, viewing data streams, and resetting service lamps, catering to the needs of the vehicle maintenance market.

**Highlights:** Bluetooth vehicle data interaction, One-click intelligent diagnosis, Full system fault diagnosis, Read DTCs, Read Data Streams, Clear DTCs, Reset Service Lamp

**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 EasyDiag4 free?

EasyDiag4 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, EasyDiag4 or KDIAG?

KDIAG is rated higher. EasyDiag4 averages 2.9 out of 5 from 19 ratings, while KDIAG averages 3.4 from 17 ratings.

### Do EasyDiag4 or KDIAG have ads?

Neither EasyDiag4 nor KDIAG shows ads.

### Which is updated more often, EasyDiag4 or KDIAG?

EasyDiag4 ships an update every 18 months, and KDIAG every 3 weeks. Most recently, EasyDiag4 was updated on September 20, 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.*