Comparison

Dr.OBD 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

Dr.OBD

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Dr.OBD is a mobile phone app that do analysis on vehicle diagnostic fault code. It can automatically retrieve the fault codes diagnosed by OBD device via Bluetooth 4.0. Also, it will send notification alert at mobile phone side and auto query each fault code corresponding to the fault description, expert failure analysis and solutions. Meanwhile, it can provide share and print function.

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
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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

Dr.OBD3 screens
ChkOBD OBD2 Analyzer4 screens

Verdict

The call

The clearest difference is in-app purchases: Dr.OBD at none against ChkOBD OBD2 Analyzer's 4. Dr.OBD also leads on iOS requirement (11.0 vs 13.0). 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. Dr.OBD asks for nothing beyond the download.

UpkeepUpdate frequency

Dr.OBD ships an update every 2 months, ChkOBD OBD2 Analyzer every 3 months. The most recent releases landed on September 22, 2026 and June 5, 2026 respectively.

Scorecard2 real differences · 7 level
Dr.OBD versus ChkOBD OBD2 Analyzer: the parameters behind the verdict, then further details
ParameterDr.OBDChkOBD OBD2 Analyzer
PriceFreeFree
Rating—3.0 (4 ratings) — better
Number of ratings—4 — better
Update frequencyEvery 2 months — betterEvery 3 months
AdsNoNo
In-app purchasesNo — betterYes
Monetization—Free with in-app purchases
DevicesiPhone, iPodiPhone, iPad, iPod — better
Requires iOS11.0 — better13.0
Further details — not scored
Size3 MB63 MB
Age rating4+4+
DeveloperShenzhen Leagend Optoelectronics Co., Ltd.Check On-Board Diagnostics LLC

In-app purchases

None

Dr.OBD

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 Dr.OBD free?
Dr.OBD 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.
Do Dr.OBD or ChkOBD OBD2 Analyzer have ads?
Neither Dr.OBD nor ChkOBD OBD2 Analyzer shows ads.
Which is updated more often, Dr.OBD or ChkOBD OBD2 Analyzer?
Dr.OBD ships an update every 2 months, and ChkOBD OBD2 Analyzer every 3 months. Most recently, Dr.OBD was updated on September 22, 2026 and ChkOBD OBD2 Analyzer on June 5, 2026.

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