Rheosoft OBD2 vs UJS OBD Pro
Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.
Rheosoft OBD2
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Provide a view of OBDII diagnostic codes, readiness flags and sensor values to assist the driver. Requires an ELM327 compatible adapter.
UJS OBD Pro
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UJS OBD Pro is exclusively designed to support UJS ROCCO Pro, serving as a professional car diagnostic and real-time monitoring application. It supports full OBDIl/EOBD standard protocols and multi-system diagnostics for ABS, Engine, Transmission and Airbag (SRS). Connect your smartphone to the UJS OBD Pro device to unlock comprehensive vehicle management. Enjoy key features including fault code reading and clearing, real-time data monitoring, performance testing, deep system scanning, AI-powered insights, customizable reports, and detailed trip 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. Drivers' safety and customer satisfaction are our top priorities. That's why we offer our products at an affordable price with no subscriptions and no hidden costs—ever. Every UJS diagnostic tool includes lifetime free updates and ongoing technical support, ensuring your device stays accurate and reliable for years to come. UJS OBD Pro offers multi-language support, including English, Español, Русский, 日本語,and 中文,ensuring seamless usability for users worldwide. Caution: 1. This app only supports adapters compatible with Bluetooth 5.1. 2. Available parameters may vary depending on your vehicle, as they are defined by the vehicle’s control unit rather than the UJS OBD app. 3. UJS OBD Pro is specifically optimized for use with UJS series products (UJS ROCCO Pro); compatibility with other devices is not guaranteed.
Screenshots
Verdict
The clearest difference is iOS requirement: UJS OBD Pro at 13 against Rheosoft OBD2's 26.0. On price, ads, in-app purchases and device support 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.
| Parameter | Rheosoft OBD2 | UJS OBD Pro |
|---|---|---|
| Price | Free | Free |
| Update frequency | — | Every 6 weeks |
| Ads | No | No |
| In-app purchases | No | No |
| Devices | iPhone, iPad | iPhone, iPod |
| Requires iOS | 26.0 | 13 — better |
| Further details — not scored | ||
| Size | 3 MB | 134 MB |
| Age rating | 4+ | 4+ |
| Developer | James Mittler II | UJS INC |
In-app purchases
Rheosoft OBD2
No in-app purchases
UJS OBD Pro
No in-app purchases





