Comparison

Rheosoft OBD2 vs UJS OBD Pro

Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.

Head to head
About

Rheosoft OBD2

Features
Read full description

Provide a view of OBDII diagnostic codes, readiness flags and sensor values to assist the driver. Requires an ELM327 compatible adapter.

About

UJS OBD Pro

Features
Read full description

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

Rheosoft OBD22 screens
UJS OBD Pro4 screens

Verdict

The call

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

CostPrice · In-app purchases · Ads · Monetization

Both are free to download. Neither carries in-app purchases, so what you see is what you pay.

Scorecard1 real difference · 5 level
Rheosoft OBD2 versus UJS OBD Pro: the parameters behind the verdict, then further details
ParameterRheosoft OBD2UJS OBD Pro
PriceFreeFree
Update frequency—Every 6 weeks
AdsNoNo
In-app purchasesNoNo
DevicesiPhone, iPadiPhone, iPod
Requires iOS26.013 — better
Further details — not scored
Size3 MB134 MB
Age rating4+4+
DeveloperJames Mittler IIUJS INC

In-app purchases

None

Rheosoft OBD2

No in-app purchases

None

UJS OBD Pro

No in-app purchases

Questions

Is Rheosoft OBD2 free?
Rheosoft OBD2 is free to download, with no in-app purchases.
Is UJS OBD Pro free?
UJS OBD Pro is free to download, with no in-app purchases.
Do Rheosoft OBD2 or UJS OBD Pro have ads?
Neither Rheosoft OBD2 nor UJS OBD Pro shows ads.

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