VDIAGTOOL vs UJS OBDII
Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.
VDIAGTOOL
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.
- 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
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VDIAGTOOL - Your Pocket-Sized Professional Diagnostic Solution VDIAGTOOL is a compact, full-system diagnostic tool that pairs seamlessly with your smartphone or tablet . This complete kit includes a high-speed Bluetooth OBDII adapter and the powerful VDIAGTOOL app - the ultimate DIY solution for comprehensive vehicle scanning. Key Advantages: Full-Vehicle Coverage - Complete diagnostics for all major systems across global brands Professional Special Functions - Oil service reset, DPF regeneration, EPB maintenance True Portability - Pocket-sized design for on-the-go diagnostics Cross-Platform Compatibility - Works flawlessly with both iOS devices Complete Package - Includes everything needed for professional-level scanning and more...
UJS OBDII
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.
- 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
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UJS OBD is exclusively designed to support UJS OBDII series products, serving as a professional car diagnostic and real-time monitoring application. It offers multi-language support, including English, Español, Русский, 日本語，and 中文，ensuring seamless usability for users worldwide. By connecting your smartphone to the UJS OBDII vehicle terminal via Bluetooth, the app enables comprehensive vehicle management—covering core functions such as fault code reading & clearing, real-time instrument panel display, vehicle performance testing, and detailed travel analysis. It also features high-speed data transmission capabilities, paired with outstanding low-power consumption and ultra-energy-saving performance, ensuring long-lasting use without excessive battery drain. Caution: 1. This app only supports adapters compatible with Bluetooth 4.0/5.0. 2. The range of parameters accessible for each vehicle varies and is determined by the vehicle’s own control unit, not by the UJS OBD app. 3. UJS OBD is specifically optimized for use with UJS OBDII series products; compatibility with other devices is not guaranteed.
Screenshots
Verdict
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.
Scored on Price · Rating · Positive reviews · Number of ratings · Update frequency · Ads · In-app purchases · Monetization · Best chart rank · Devices · Requires iOS
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.
| Parameter | VDIAGTOOL | UJS OBDII |
|---|---|---|
| Price | Free | Free |
| Rating | 2.8 (8 ratings) | 5.0 (1 ratings) — better |
| Positive reviews | 40.0% of reviews | 100.0% of reviews — better |
| Number of ratings | 8 — better | 1 |
| Update frequency | Every 3 weeks — better | Every 6 weeks |
| Ads | No | No |
| In-app purchases | No | No |
| Monetization | Free | Free |
| Devices | iPhone, iPad, iPod — better | iPhone, iPod |
| Requires iOS | 15.6 | 13 — better |
| Further details — not scored | ||
| Size | 1.1 GB | 81 MB |
| Age rating | 4+ | 4+ |
| Developer | Shenzhen VDIAGTOOL Technology Co., Ltd | UJS INC |
Customer experience
VDIAGTOOL
UJS OBDII
In-app purchases
VDIAGTOOL
No in-app purchases
UJS OBDII
No in-app purchases
