# KDIAG vs Launch AIOBD

The clearest difference is rating: KDIAG at 3.4 against Launch AIOBD's 2.3. KDIAG also leads on in-app purchases (none vs 19) and review sentiment (33% vs 0%). Launch AIOBD's advantage is iOS requirement (13.0 vs 17.0). On price, update cadence, ads and device support there is nothing between them.

Both are free to download. Launch AIOBD sells 19 one-off in-app purchases. KDIAG asks for nothing beyond the download.

KDIAG holds the better App Store score, 3.4 against 2.3. That said, the two scores are not equally well evidenced: KDIAG has 17 ratings behind it against 3, 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 0% of Launch AIOBD's.

KDIAG ships an update every 3 weeks, Launch AIOBD fortnightly. The most recent releases landed on September 21, 2026 and September 20, 2026 respectively.

## The numbers

| Metric | KDIAG | Launch AIOBD |
| --- | --- | --- |
| Price | Free | Free |
| Rating | **[3.4 (17 ratings)](https://appshunter.io/ios/app/kdiag/id6450169808/reviews)** | [2.3 (3 ratings)](https://appshunter.io/ios/app/launch-aiobd/id6739603189/reviews) |
| Number of ratings | **17** | 3 |
| Positive reviews | **33.3% of reviews** | 0.0% of reviews |
| In-app purchases | **No** | Yes |
| Ads | No | No |
| Update frequency | Every 3 weeks | **Fortnightly** |
| Monetization | **Free** | Free with in-app purchases |
| Size | 74 MB | 751 MB |
| Requires iOS | 17.0 | **13.0** |
| Devices | **iPhone, iPad, iPod** | iPhone, iPod |
| Age rating | 4+ | 17+ |
| Developer | [祖策 谢](https://appshunter.io/developer/983519195) | [Launch Tech Co., Ltd](https://appshunter.io/developer/447568418) |

## 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


### Launch AIOBD

[App page](https://appshunter.io/ios/app/launch-aiobd/id6739603189)

This tool diagnoses vehicle faults using a mobile device and a Bluetooth connector. It performs full system diagnostics, reads and clears trouble codes, and analyzes data streams for various car models.

**Highlights:** Full system vehicle diagnosis, One-click intelligent diagnosis, Read and clear DTCs, Read data streams, Salt spray testing, Supports mainstream models

**Features:** macOS Compatibility, Vision Pro support

**In-app purchases (19)**

| Purchase | Price | Billing |
| --- | --- | --- |
| FIAT | $0.29 | one-time |
| Software services(2.99) | $2.99 | one-time |
| Software services(3.99) | $3.99 | one-time |
| Software services(4.99) | $4.99 | one-time |
| Software services(8.99) | $8.99 | one-time |
| Software services(9.99) | $9.99 | one-time |
| Software services(29.99) | $29.99 | one-time |
| Software services(31.99) | $31.99 | one-time |
| MAZDA | $35.99 | one-time |
| BENZ | $35.99 | one-time |
| GM | $35.99 | one-time |
| HONDA | $35.99 | one-time |
| HYUNDAI | $35.99 | one-time |
| NISSAN | $35.99 | one-time |
| TOYOTA | $35.99 | one-time |
| USAFORD | $35.99 | one-time |
| VM | $35.99 | one-time |
| VOLVO | $35.99 | one-time |
| CHRYSLER | $35.99 | one-time |


## Frequently asked questions

### Is KDIAG free?

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

### Is Launch AIOBD free?

Launch AIOBD is free to download, with in-app purchases available.

### Which has better reviews, KDIAG or Launch AIOBD?

KDIAG is rated higher. KDIAG averages 3.4 out of 5 from 17 ratings, while Launch AIOBD averages 2.3 from 3 ratings.

### Do KDIAG or Launch AIOBD have ads?

Neither KDIAG nor Launch AIOBD shows ads.

### Which is updated more often, KDIAG or Launch AIOBD?

KDIAG ships an update every 3 weeks, and Launch AIOBD fortnightly. Most recently, KDIAG was updated on September 21, 2026 and Launch AIOBD on September 20, 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.*