# KDIAG vs DND

The clearest difference is review sentiment: DND at 100% against KDIAG's 33%. DND also leads on rating (5.0 vs 3.4) and update cadence (every 8 days vs every 3 weeks). KDIAG's advantage is ratings volume (17 vs 1) and device support (3 vs 1). On price, ads, in-app purchases and monetization model there is nothing between them.

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

DND holds the better App Store score, 5.0 against 3.4. That said, the two scores are not equally well evidenced: KDIAG has 17 ratings behind it against 1, so its average is the more settled of the two. Written reviews point the same way: 33% of KDIAG's written reviews are positive against 100% of DND's.

KDIAG ships an update every 3 weeks, DND every 8 days. The most recent releases landed on September 21, 2026 and September 17, 2026 respectively.

## The numbers

| Metric | KDIAG | DND |
| --- | --- | --- |
| Price | Free | Free |
| Rating | [3.4 (17 ratings)](https://appshunter.io/ios/app/kdiag/id6450169808/reviews) | **[5.0 (1 ratings)](https://appshunter.io/ios/app/dnd/id6451104638/reviews)** |
| Number of ratings | **17** | 1 |
| Positive reviews | 33.3% of reviews | **100.0% of reviews** |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | Every 3 weeks | **Every 8 days** |
| Monetization | Free | Free |
| Size | 74 MB | 339 MB |
| Requires iOS | 17.0 | **16.6** |
| Devices | **iPhone, iPad, iPod** | iPhone |
| Age rating | 4+ | 4+ |
| Developer | [祖策 谢](https://appshunter.io/developer/983519195) | [MATL TECH INC.](https://appshunter.io/developer/1735263917) |

## What reviewers say

### 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


### DND

[App page](https://appshunter.io/ios/app/dnd/id6451104638)

This tool helps you understand your vehicle's health and diagnose issues. It provides comprehensive diagnostic services, maintenance guidance, and real-time sensor data monitoring, making car care accessible even for beginners.

**Highlights:** OBD functionality, Enhanced diagnosis, Vehicle maintenance guidance, Locate malfunction causes, AI services, Abnormal warnings, Real-time sensor data monitoring

**Features:** macOS Compatibility

**In-app purchases:** none


## Frequently asked questions

### Is KDIAG free?

KDIAG is free to download, with no in-app purchases.

### Is DND free?

DND is free to download, with no in-app purchases.

### Which has better reviews, KDIAG or DND?

DND is rated higher. KDIAG averages 3.4 out of 5 from 17 ratings, while DND averages 5.0 from 1 ratings.

### Do KDIAG or DND have ads?

Neither KDIAG nor DND shows ads.

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

KDIAG ships an update every 3 weeks, and DND every 8 days. Most recently, KDIAG was updated on September 21, 2026 and DND on September 17, 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.*