# VDIAGTOOL vs UJS OBDII

The clearest difference is review sentiment: UJS OBDII at 100% against VDIAGTOOL's 40%. UJS OBDII also leads on rating (5.0 vs 2.8) and iOS requirement (13 vs 15.6). VDIAGTOOL's advantage is ratings volume (8 vs 1). On price, update cadence, 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.

UJS OBDII holds the better App Store score, 5.0 against 2.8. That said, the two scores are not equally well evidenced: VDIAGTOOL has 8 ratings behind it against 1, so its average is the more settled of the two. Written reviews point the same way: 40% of VDIAGTOOL's written reviews are positive against 100% of UJS OBDII's.

VDIAGTOOL ships an update every 3 weeks, UJS OBDII every 6 weeks. The most recent releases landed on October 25, 2026 and October 24, 2026 respectively.

## The numbers

| Metric | VDIAGTOOL | UJS OBDII |
| --- | --- | --- |
| Price | Free | Free |
| Rating | [2.8 (8 ratings)](https://appshunter.io/ios/app/vdiagtool/id6751025207/reviews) | **[5.0 (1 ratings)](https://appshunter.io/ios/app/ujs-obdii/id6753165961/reviews)** |
| Number of ratings | **8** | 1 |
| Positive reviews | 40.0% of reviews | **100.0% of reviews** |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | **Every 3 weeks** | Every 6 weeks |
| Monetization | Free | Free |
| Size | 1.1 GB | 81 MB |
| Requires iOS | 15.6 | **13** |
| Devices | **iPhone, iPad, iPod** | iPhone, iPod |
| Age rating | 4+ | 4+ |
| Developer | [Shenzhen VDIAGTOOL Technology Co., Ltd](https://appshunter.io/developer/1833169281) | [UJS INC](https://appshunter.io/developer/1842801577) |

## What reviewers say

### VDIAGTOOL

[App page](https://appshunter.io/ios/app/vdiagtool/id6751025207)

This app provides comprehensive vehicle diagnostics, acting as a portable, professional solution. It connects to a Bluetooth OBDII adapter for full-system scanning and special functions on various car brands.

**Highlights:** Full-system vehicle diagnostics, Professional special functions (oil reset, DPF regen, EPB), High-speed Bluetooth OBDII adapter included, Portable, pocket-sized design, Cross-platform iOS compatibility

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

**In-app purchases:** none


### UJS OBDII

[App page](https://appshunter.io/ios/app/ujs-obdii/id6753165961)

This professional car diagnostic app connects to UJS OBDII devices via Bluetooth to read and clear fault codes, monitor real-time vehicle performance, and analyze travel data. It supports multiple languages and offers high-speed, low-power data transmission.

**Highlights:** Fault code reading and clearing, Real-time instrument panel display, Vehicle performance testing, Detailed travel analysis, Multi-language support, High-speed data transmission, Low-power consumption

**Features:** macOS Compatibility

**In-app purchases:** none


## Frequently asked questions

### Is VDIAGTOOL free?

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

### Is UJS OBDII free?

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

### Which has better reviews, VDIAGTOOL or UJS OBDII?

UJS OBDII is rated higher. VDIAGTOOL averages 2.8 out of 5 from 8 ratings, while UJS OBDII averages 5.0 from 1 ratings.

### Do VDIAGTOOL or UJS OBDII have ads?

Neither VDIAGTOOL nor UJS OBDII shows ads.

### Which is updated more often, VDIAGTOOL or UJS OBDII?

VDIAGTOOL ships an update every 3 weeks, and UJS OBDII every 6 weeks. Most recently, VDIAGTOOL was updated on October 25, 2026 and UJS OBDII on October 24, 2026.

---

*Compared by [AppsHunter](https://appshunter.io/) from daily US App Store data. Review summaries are generated from verbatim App Store reviews.*