Comparison

ChkOBD OBD2 Analyzer vs OBD Connect

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

OBD Connect

Monitor your car's performance in real-time with virtual gauges and graphs. Diagnose and clear trouble codes to understand vehicle malfunctions before visiting a mechanic. Track fuel economy to save on gas.

Highlights
  • Real-time performance monitoring
  • Trouble code reading and clearing
  • Fuel economy tracking
  • Customizable gauges and graphs
  • Car profiles and settings
  • Race track data and drag times
Features
Read full description

Track performance of your car in real time with virtual gauges and graphs. Troubleshoot malfunctions by accessing the on board ECU. Know what is wrong with your car before taking it to the mechanic. Don't get ripped off when buying a used car. Run our diagnostics feature and get a vehicle health score. These are just some of the features OBD Connect has to offer. OBD Connect transforms your phone into an all in one performance monitoring and troubleshooting tool for your car. ** Notice - We don't recommend using knock-off adapters as it may not be compatible with the app. OBD Connect features: • Customizable gauges track up to 100 sensors in real time including fuel economy, G-force, gear display and battery voltage. • Fast polling rate allows for a smoother and more responsive gauges and graphing.* • Read and Clear trouble codes and reset MIL (service engine light). Over a thousand codes available with description, causes and symptoms. • Metric and Imperial measures. • Real-time user-defined sensor plotting. Graph as many sensors desired at the same time on interactive graph that can be scrolled, paused. • Gauge list feature can track every sensor at the same time. • CarPlay, display gauges on car head unit. • Create car profiles and customize settings. • Freeze frame support (mode 02). • Instant horsepower, mpg/kpl fuel economy, boost pressure and G force tracking. • Read Vehicle VIN number, calibration ID and more (mode 09). • Speed limit warning: Get notified when driving over speed limit. • High oil/coolant temperature warning gives you instant notification when your car is running too hot. • HUD mode for dashboard view : Heads up display for driving at night. • Emissions test readiness. • Multiple ECU support. • Shift light. • Two themes to choose from. • Landscape mode. • High value sensor gauge notification. • Enhanced PID support for specific manufacturers (mode 22). • Fuel Economy: - Instant and average fuel economy tracking for 0-5 min, 0-30 min and 0-2 hr intervals and a detailed summary. - Long term tracking with six different intervals. (1 week, 2 weeks, 4 weeks, 13 weeks, 26 and 52 weeks). - 4 different units of measure: MPG,KPL (Km/L), L/100 Km, Miles per imperial gallon. - Interactive graph of long term data that can be cropped and scrolled through. - Export fuel history to CSV file (spreadsheets). - Other statistics: Distance travelled, average speed, money spent, CO2 produced and fuel consumed. - 3 methods of calculation available. For non MAF vehicles. • Race track package: - Real time lap data, gap delay time and position in race track using high frequency GPS tracking. - Comprehensive summary of race with lap times, speed fluctuations on track and more. - Get drag racing times (0-60 mph, 0-100 mph, 1/4 mile 1/8 mile etc.) - Load and save unlimited number of tracks onto device. - Crucial racing data including real time horsepower, g-force and a detailed driving summary. Share your results with friends. - Transmission gear information and optional shifting assistant which notifies optimal moment of shifting gears. - Customizable view that toggles between speed/rpm gauge, real time track positioning and G-sensor feedback. - Record your race in HD with gauge and track overlays. (dash cam add-on required) • Dashcam: Record smooth HD video with overlaying gauges (speed,rpm, etc), time, location (GPS coordinates) and G-force sensor in four different resolutions. You can record from 90 sensors and up to 5 gauges. • Sensor logger: You can record many sensors at the same time with 5 different refresh rates. Save graph sensor data to CSV file and export to PC/MAC for further analysis. Send real time data to TCP socket (IP Address) over network. ** NOTICE** OBD Connect is compatible with WIFI adapters, OBDLink MX+, Vgate vLinker FS/MS and the following Bluetooth LE adapters: Kiwi 3/4 PLX, Veepeak BLE, Carista BT, LE LElink and VGate iCar Pro/ pro 2, vLinker FD+,MC+ adapter.

Screenshots

ChkOBD OBD2 Analyzer4 screens
OBD Connect4 screens

Verdict

The call

The clearest difference is price: ChkOBD OBD2 Analyzer at Free against OBD Connect's $9.99. OBD Connect's advantage is rating (3.8 vs 3.0) and in-app purchases (none vs 4). On ads, device support and iOS requirement 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

ChkOBD OBD2 Analyzer is free to download; OBD Connect costs $9.99 up front. ChkOBD OBD2 Analyzer sells 4 in-app purchases, starting at $4.99 per month. OBD Connect asks for nothing beyond the download.

ReceptionRating · Positive reviews · Number of ratings

OBD Connect holds the better App Store score, 3.8 against 3.0. That said, the two scores are not equally well evidenced: OBD Connect has 55 ratings behind it against 4, so its average is the more settled of the two.

UpkeepUpdate frequency

ChkOBD OBD2 Analyzer ships an update every 3 months, OBD Connect every 6 days. The most recent releases landed on June 5, 2026 and September 22, 2026 respectively.

Scorecard6 real differences · 4 level
ChkOBD OBD2 Analyzer versus OBD Connect: the parameters behind the verdict, then further details
ParameterChkOBD OBD2 AnalyzerOBD Connect
PriceFree — better$9.99
Rating3.0 (4 ratings)3.8 (55 ratings) — better
Positive reviews—31.8% of reviews
Number of ratings455 — better
Update frequencyEvery 3 monthsEvery 6 days — better
AdsNoNo
In-app purchasesYesNo — better
MonetizationFree with in-app purchases — betterPaid
DevicesiPhone, iPad, iPodiPhone, iPad, iPod
Requires iOS13.013.0
Further details — not scored
Size63 MB14 MB
Age rating4+4+
DeveloperCheck On-Board Diagnostics LLCAlphabit Software Inc.

Customer experience

ChkOBD OBD2 Analyzer

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

OBD Connect

All ratings55 ratings
Positive69.1%
Neutral7.3%
Negative23.6%
Written reviews22 reviews
Positive31.8%
Neutral27.3%
Negative40.9%

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
None

OBD Connect

No in-app purchases

Questions

Is ChkOBD OBD2 Analyzer free?
ChkOBD OBD2 Analyzer is free to download, with in-app purchases available.
Is OBD Connect free?
OBD Connect costs $9.99, with no in-app purchases.
Which has better reviews, ChkOBD OBD2 Analyzer or OBD Connect?
OBD Connect is rated higher. ChkOBD OBD2 Analyzer averages 3.0 out of 5 from 4 ratings, while OBD Connect averages 3.8 from 55 ratings.
Do ChkOBD OBD2 Analyzer or OBD Connect have ads?
Neither ChkOBD OBD2 Analyzer nor OBD Connect shows ads.
Which is updated more often, ChkOBD OBD2 Analyzer or OBD Connect?
ChkOBD OBD2 Analyzer ships an update every 3 months, and OBD Connect every 6 days. Most recently, ChkOBD OBD2 Analyzer was updated on June 5, 2026 and OBD Connect on September 22, 2026.

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