# KDIAG vs GOOLOO OBD

The clearest difference is rating: KDIAG at 3.4 against GOOLOO OBD's 1.0. KDIAG also leads on in-app purchases (none vs 10) and update cadence (every 3 weeks vs every 3 months). GOOLOO OBD's advantage is iOS requirement (11.0 vs 17.0). On price, ads and device support there is nothing between them.

Both are free to download. GOOLOO OBD sells 10 in-app purchases, starting at $4.99 per month. KDIAG asks for nothing beyond the download.

KDIAG holds the better App Store score, 3.4 against 1.0. 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.

KDIAG ships an update every 3 weeks, GOOLOO OBD every 3 months. The most recent releases landed on September 21, 2026 and September 4, 2026 respectively.

## The numbers

| Metric | KDIAG | GOOLOO OBD |
| --- | --- | --- |
| Price | Free | Free |
| Rating | **[3.4 (17 ratings)](https://appshunter.io/ios/app/kdiag/id6450169808/reviews)** | [1.0 (1 ratings)](https://appshunter.io/ios/app/gooloo-obd/id6747735228/reviews) |
| Number of ratings | **17** | 1 |
| Positive reviews | 33.3% of reviews | — |
| In-app purchases | **No** | Yes |
| Ads | No | No |
| Update frequency | **Every 3 weeks** | Every 3 months |
| Monetization | **Free** | Free with in-app purchases |
| Size | 74 MB | 1.6 GB |
| Requires iOS | 17.0 | **11.0** |
| Devices | **iPhone, iPad, iPod** | iPhone, iPod |
| Age rating | 4+ | 4+ |
| Developer | [祖策 谢](https://appshunter.io/developer/983519195) | [Changsha Angsi E-commerce Co., Ltd.](https://appshunter.io/developer/1797024413) |

## 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


### GOOLOO OBD

[App page](https://appshunter.io/ios/app/gooloo-obd/id6747735228)

This app transforms your phone into a powerful car diagnostic tool via Bluetooth. It offers comprehensive system checks, full OBD2 functions, and specialized maintenance services for a wide range of vehicle brands.

**Highlights:** Full System Diagnosis, Full OBD2 Functions, 6 Special Maintenance Functions, Repair Data Library, AutoVIN Vehicle Identification, Bluetooth 5.0 Wireless Connection, Diagnostic Report Generation

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

**In-app purchases (10)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Monthly Auto-renewal | $4.99 | per month |
| Annual Auto-renewal | $29.99 | per year |
| Renault Gateway 5 Tokens | $147.99 | one-time |
| Nissan Gateway 5 Tokens (EU only) | $147.99 | one-time |
| FCA Gateway 1-year Access (EU only) | $229.99 | one-time |
| VW SFD Gateway 1-year Access | $229.99 | one-time |
| Renault Gateway 10 Tokens | $254.99 | one-time |
| Nissan Gateway 10 Tokens (EU only) | $254.99 | one-time |
| Renault Gateway 20 Tokens | $464.99 | one-time |
| Nissan Gateway 20 Tokens (EU only) | $464.99 | one-time |


## Frequently asked questions

### Is KDIAG free?

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

### Is GOOLOO OBD free?

GOOLOO OBD is free to download, with in-app purchases available.

### Which has better reviews, KDIAG or GOOLOO OBD?

KDIAG is rated higher. KDIAG averages 3.4 out of 5 from 17 ratings, while GOOLOO OBD averages 1.0 from 1 ratings.

### Do KDIAG or GOOLOO OBD have ads?

Neither KDIAG nor GOOLOO OBD shows ads.

### Which is updated more often, KDIAG or GOOLOO OBD?

KDIAG ships an update every 3 weeks, and GOOLOO OBD every 3 months. Most recently, KDIAG was updated on September 21, 2026 and GOOLOO OBD on September 4, 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.*