iOBD2 vs ChkOBD OBD2 Analyzer
Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.
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.
- Diagnostic Trouble Code reference
- Fault code lookup
- Vehicle system diagnostics
- Problem identification
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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.
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.
- View engine values
- In-app purchase for advanced data
- Smog Check Assistant
- VIN Analyzer
- Error Decoder and Reset
- Bluetooth adapter compatibility check
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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
Verdict
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
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.
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.
Both ship on a similar rhythm, roughly every 3 months. The most recent releases landed on October 11, 2026 and October 13, 2026 respectively.
| Parameter | iOBD2 | ChkOBD OBD2 Analyzer |
|---|---|---|
| Price | Free | Free |
| Rating | 4.0 (19 ratings) — better | 3.0 (4 ratings) |
| Positive reviews | 28.6% of reviews | — |
| Number of ratings | 19 — better | 4 |
| Update frequency | Every 3 months | Every 3 months |
| Ads | No | No |
| In-app purchases | No — better | Yes |
| Monetization | Free — better | Free with in-app purchases |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Requires iOS | 4.3 — better | 13.0 |
| Further details — not scored | ||
| Size | 44 MB | 63 MB |
| Age rating | 4+ | 4+ |
| Developer | 翔宇 金 | Check On-Board Diagnostics LLC |
Customer experience
iOBD2
ChkOBD OBD2 Analyzer
In-app purchases
iOBD2
No in-app purchases
ChkOBD OBD2 Analyzer
- Smog Check Assistant$4.991 Month
- VIN Analyzer$1.99
- Error Analyzer$2.99
- Advance Engine Values$4.99
Questions
Is iOBD2 free?
Is ChkOBD OBD2 Analyzer free?
Which has better reviews, iOBD2 or ChkOBD OBD2 Analyzer?
Do iOBD2 or ChkOBD OBD2 Analyzer have ads?
Which is updated more often, iOBD2 or ChkOBD OBD2 Analyzer?
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