# VT vs KDIAG

The clearest difference is update cadence: KDIAG at fortnightly against VT's every 2 months. VT's advantage is iOS requirement (9.0 vs 17.0). On price, ads, in-app purchases and device support there is nothing between them.

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

VT ships an update every 2 months, KDIAG fortnightly. Both last shipped on November 3, 2026.

## The numbers

| Metric | VT | KDIAG |
| --- | --- | --- |
| Price | Free | Free |
| Rating | — | **[3.3 (20 ratings)](https://appshunter.io/ios/app/kdiag/id6450169808/reviews)** |
| Number of ratings | — | **20** |
| Positive reviews | — | 30.8% of reviews |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | Every 2 months | **Fortnightly** |
| Monetization | — | Free |
| Size | 34 MB | 74 MB |
| Requires iOS | **9.0** | 17.0 |
| Devices | **iPhone, iPad, iPod** | iPhone, iPad |
| Age rating | 4+ | 4+ |
| Developer | [巍巍 蒋](https://appshunter.io/developer/1439271480) | [祖策 谢](https://appshunter.io/developer/983519195) |

## What reviewers say

### VT

[App page](https://appshunter.io/ios/app/vt-hts/id1517338260)

**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 VT free?

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

### Is KDIAG free?

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

### Do VT or KDIAG have ads?

Neither VT nor KDIAG shows ads.

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

VT ships an update every 2 months, and KDIAG fortnightly. Most recently, VT was updated on November 3, 2026 and KDIAG on November 3, 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.*