Comparison

iOBD2 vs ChkOBD OBD2 Analyzer

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

Head to head
About

iOBD2

This app serves as a reference for standard Diagnostic Trouble Codes (DTCs) found in vehicles. It helps users understand fault codes generated by a car's onboard computer, aiding in problem diagnosis.

Highlights
  • Diagnostic Trouble Code reference
  • Fault code lookup
  • Vehicle system diagnostics
  • Problem identification
Features
Read full description

Standard Diagnostic Trouble Codes reference book. A Diagnostic Trouble Code is set in a vehicle's on-board computer when a fault occurs in any monitored system. The code number corresponds to the type of fault, and can be used to diagnose the problem.

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.

Screenshots

iOBD24 screens
ChkOBD OBD2 Analyzer4 screens

Verdict

The call

The clearest difference is rating: iOBD2 at 4.0 against ChkOBD OBD2 Analyzer's 3.0. iOBD2 also leads on in-app purchases (none vs 4) and ratings volume (19 vs 4). On price, update cadence, ads 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. ChkOBD OBD2 Analyzer sells 4 in-app purchases, starting at $4.99 per month. iOBD2 asks for nothing beyond the download.

ReceptionRating · Positive reviews · Number of ratings

iOBD2 holds the better App Store score, 4.0 against 3.0. Both are backed by a comparable volume of ratings — 19 and 4 respectively.

UpkeepUpdate frequency

Both ship on a similar rhythm, roughly every 3 months. The most recent releases landed on October 11, 2026 and October 13, 2026 respectively.

Scorecard5 real differences · 5 level
iOBD2 versus ChkOBD OBD2 Analyzer: the parameters behind the verdict, then further details
ParameteriOBD2ChkOBD OBD2 Analyzer
PriceFreeFree
Rating4.0 (19 ratings) — better3.0 (4 ratings)
Positive reviews28.6% of reviews—
Number of ratings19 — better4
Update frequencyEvery 3 monthsEvery 3 months
AdsNoNo
In-app purchasesNo — betterYes
MonetizationFree — betterFree with in-app purchases
DevicesiPhone, iPad, iPodiPhone, iPad, iPod
Requires iOS4.3 — better13.0
Further details — not scored
Size44 MB63 MB
Age rating4+4+
Developer翔宇 金Check On-Board Diagnostics LLC

Customer experience

iOBD2

All ratings19 ratings
Positive73.7%
Neutral0.0%
Negative26.3%
Written reviews7 reviews
Positive28.6%
Neutral0.0%
Negative71.4%

ChkOBD OBD2 Analyzer

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

In-app purchases

None

iOBD2

No 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

Questions

Is iOBD2 free?
iOBD2 is free to download, with no in-app purchases.
Is ChkOBD OBD2 Analyzer free?
ChkOBD OBD2 Analyzer is free to download, with in-app purchases available.
Which has better reviews, iOBD2 or ChkOBD OBD2 Analyzer?
iOBD2 is rated higher. iOBD2 averages 4.0 out of 5 from 19 ratings, while ChkOBD OBD2 Analyzer averages 3.0 from 4 ratings.
Do iOBD2 or ChkOBD OBD2 Analyzer have ads?
Neither iOBD2 nor ChkOBD OBD2 Analyzer shows ads.
Which is updated more often, iOBD2 or ChkOBD OBD2 Analyzer?
iOBD2 ships an update every 3 months, and ChkOBD OBD2 Analyzer every 3 months. Most recently, iOBD2 was updated on October 11, 2026 and ChkOBD OBD2 Analyzer on October 13, 2026.

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