Comparison

ChkOBD OBD2 Analyzer vs ELMCheck

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

Head to head
About

ChkOBD OBD2 Analyzer

Connect your iPhone or iPad to your car's engine to view vital data. Access basic engine values for free, with in-app purchases for advanced diagnostics, smog check readiness, VIN analysis, and error decoding.

Highlights
  • View engine values
  • In-app purchase for advanced data
  • Smog Check Assistant
  • VIN Analyzer
  • Error Decoder and Reset
  • Bluetooth adapter compatibility check
Features
Read full description

ChkOBD let you connect your iPhone and iPad to your Car and view the most important Engine values in a very intuitive user interface in an appealing user-friendly way. ChkOBD connects wirelessly to an ELM237 enabled OBDII - Bluetooth adapter which is readily available from many 3rd party vendors. From this free application that let you have access to the basic “Engine Values”, you will have In-App purchase to access additional information such as : . Advanced Engine Values, an extended choice of sensors available on your car, that you can select and monitor. The available Engine Value from your car, are all listed in a “grey” mode, so, you will have no surprise of what you will get (or not get !) after the In App purchase . Smog Check Assistant, to know if your car will pass the next Smog Check at the state official station, or the App will let you know what needs to be fixed, before driving there, . VIN Analyzer, will let you know what information is in the “government file” from your car, including date and place of manufacturing, . Error Decoder and Reset, to know what is the current error that is in the Memory of the computer of your car and let you have a way to try to reset this error (Normally, it comes back on, if the cause of the error is not mechanically fixed). This is an error scan that is going through about 4'000 possible errors. Usually all these information will be read from all car that have been sold in the USA after 2005. The fact that these applications are offered from inside a free app, in our side, from this free app, we are able to check before any of your purchase, that your car and your Bluetooth adapter will be 100% compatible with these applications. We are using this technology to try to provide to our customers the best possible satisfaction.

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.

Screenshots

ChkOBD OBD2 Analyzer4 screens
ELMCheck4 screens

Verdict

The call

The clearest difference is rating: ELMCheck at 5.0 against ChkOBD OBD2 Analyzer's 3.0. ELMCheck also leads on update cadence (every 2 weeks vs every 3 months). ChkOBD OBD2 Analyzer's advantage is ratings volume (4 vs 1) and iOS requirement (13.0 vs 18.0). On price, ads, in-app purchases and monetization model 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. ChkOBD OBD2 Analyzer sells 4 in-app purchases, starting at $4.99 per month and ELMCheck sells 1 one-off in-app purchase. Whichever you choose, the download price is not the number that matters.

ReceptionRating · Positive reviews · Number of ratings

ELMCheck holds the better App Store score, 5.0 against 3.0. Both are backed by a comparable volume of ratings — 4 and 1 respectively.

UpkeepUpdate frequency

ChkOBD OBD2 Analyzer ships an update every 3 months, ELMCheck every 2 weeks. The most recent releases landed on October 13, 2026 and October 24, 2026 respectively.

Scorecard4 real differences · 6 level
ChkOBD OBD2 Analyzer versus ELMCheck: the parameters behind the verdict, then further details
ParameterChkOBD OBD2 AnalyzerELMCheck
PriceFreeFree
Rating3.0 (4 ratings)5.0 (1 ratings) — better
Positive reviews—100.0% of reviews
Number of ratings4 — better1
Update frequencyEvery 3 monthsEvery 2 weeks — better
AdsNoNo
In-app purchasesYesYes
MonetizationFree with in-app purchasesFree with in-app purchases
DevicesiPhone, iPad, iPodiPhone, iPad, Mac
Requires iOS13.0 — better18.0
Further details — not scored
Size63 MB14 MB
Age rating4+4+
DeveloperCheck On-Board Diagnostics LLCFearless design, LLC

Customer experience

ChkOBD OBD2 Analyzer

All ratings4 ratings
Positive50.0%
Neutral0.0%
Negative50.0%

ELMCheck

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

In-app purchases

4 purchases

ChkOBD OBD2 Analyzer

Subscriptions1
  • Smog Check Assistant$4.991 Month
One-time3
  • VIN Analyzer$1.99
  • Error Analyzer$2.99
  • Advance Engine Values$4.99
1 purchases

ELMCheck

One-time1
  • Comprehensive testing$2.99

Questions

Is ChkOBD OBD2 Analyzer free?
ChkOBD OBD2 Analyzer is free to download, with in-app purchases available.
Is ELMCheck free?
ELMCheck is free to download, with in-app purchases available.
Which has better reviews, ChkOBD OBD2 Analyzer or ELMCheck?
ELMCheck is rated higher. ChkOBD OBD2 Analyzer averages 3.0 out of 5 from 4 ratings, while ELMCheck averages 5.0 from 1 ratings.
Do ChkOBD OBD2 Analyzer or ELMCheck have ads?
Neither ChkOBD OBD2 Analyzer nor ELMCheck shows ads.
Which is updated more often, ChkOBD OBD2 Analyzer or ELMCheck?
ChkOBD OBD2 Analyzer ships an update every 3 months, and ELMCheck every 2 weeks. Most recently, ChkOBD OBD2 Analyzer was updated on October 13, 2026 and ELMCheck on October 24, 2026.

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