Comparison

ELMCheck vs UJS OBDII

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

Head to head
About

ELMCheck

Verify the authenticity and functionality of your OBD-II scanner. This app runs comprehensive tests on ELM327 commands to report supported features, ensuring safe and reliable use with your vehicle.

Highlights
  • Authenticity testing for OBD-II scanners
  • Comprehensive ELM327 command test suite
  • Reports actual supported features
  • Ensures safe scanner usage
  • Basic tests are free
  • Unlock full suite with in-app purchase
Features
Read full description

Check the authenticity of your OBD-II scanner with ELMCheck. Most OBD-II scanners on the market use some variation of ELM327, but did you know that many scanners use clones of the original ELM327? It can be hard to tell, because these clones will work well enough for basic use but fail in unexpected scenarios. This is where ELMCheck comes in. ELMCheck offers a comprehensive set of test cases that cover the entire documented set of ELM327 commands. Regardless of which version your scanner says it is, ELMCheck can provide a comprehensive report of the features that are actually supported. Get the confidence you need to use your OBD-II scanner on your vehicle safely. ELMCheck is free to run basic tests. An in-app purchase will unlock the full test suite.

About

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.

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
Read full description

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

ELMCheck4 screens
UJS OBDII4 screens

Verdict

The call

The clearest difference is in-app purchases: UJS OBDII at none against ELMCheck's 1. UJS OBDII also leads on iOS requirement (13 vs 18). ELMCheck's advantage is update cadence (every 10 days vs every 6 weeks). On price, rating, review sentiment and ratings volume 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. ELMCheck sells 1 one-off in-app purchase. UJS OBDII asks for nothing beyond the download.

ReceptionRating · Positive reviews · Number of ratings

On the App Store both sit at effectively the same score — 5.0 for ELMCheck against 5.0 for UJS OBDII. Both are backed by a comparable volume of ratings — 1 and 1 respectively. Written reviews split almost evenly too, at 100% and 100% positive.

UpkeepUpdate frequency

ELMCheck ships an update every 10 days, UJS OBDII every 6 weeks. The most recent releases landed on September 16, 2026 and June 1, 2026 respectively.

Scorecard4 real differences · 6 level
ELMCheck versus UJS OBDII: the parameters behind the verdict, then further details
ParameterELMCheckUJS OBDII
PriceFreeFree
Rating5.0 (1 ratings)5.0 (1 ratings)
Positive reviews100.0% of reviews100.0% of reviews
Number of ratings11
Update frequencyEvery 10 days — betterEvery 6 weeks
AdsNoNo
In-app purchasesYesNo — better
MonetizationFree with in-app purchasesFree — better
DevicesiPhone, iPad, Mac — betteriPhone, iPod
Requires iOS1813 — better
Further details — not scored
Size6 MB81 MB
Age rating4+4+
DeveloperFearless design, LLCUJS INC

Customer experience

ELMCheck

All ratings1 ratings
Positive100.0%
Neutral0.0%
Negative0.0%
Written reviews1 reviews
Positive100.0%
Neutral0.0%
Negative0.0%

UJS OBDII

All ratings1 ratings
Positive100.0%
Neutral0.0%
Negative0.0%
Written reviews1 reviews
Positive100.0%
Neutral0.0%
Negative0.0%

In-app purchases

1 purchases

ELMCheck

One-time1
  • Comprehensive testing$2.99
None

UJS OBDII

No in-app purchases

Questions

Is ELMCheck free?
ELMCheck is free to download, with in-app purchases available.
Is UJS OBDII free?
UJS OBDII is free to download, with no in-app purchases.
Which has better reviews, ELMCheck or UJS OBDII?
ELMCheck and UJS OBDII are both rated 5.0 out of 5 on the App Store, from 1 and 1 ratings respectively.
Do ELMCheck or UJS OBDII have ads?
Neither ELMCheck nor UJS OBDII shows ads.
Which is updated more often, ELMCheck or UJS OBDII?
ELMCheck ships an update every 10 days, and UJS OBDII every 6 weeks. Most recently, ELMCheck was updated on September 16, 2026 and UJS OBDII on June 1, 2026.

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