FourStroke is a powerful tool that analyzes and displays real-time vehicle sensors and data through your vehicle's OBD2 port, a port standard on most vehicles across the world. Use of this app requires a third-party OBD2 Wifi or Bluetooth BLE Adapter. Our app is FREE to pull and clear engine codes along with most other functionality!

FourStroke can convert your device into a heads-up display of just about every sensor your car supports, without needing expensive gauges. Sensors include RPM, coolant temperature, vehicle speed, air flow, O2 sensor data, and more (sensor support varies based on vehicle).

Quickly diagnose a check engine light (CEL) by pulling up exactly what error codes are present. FourStroke automatically turns the code into a readable description. Your vehicle also may store 'Freeze Frames' that detail what sensor data was present when the CEL first occurred; FourStroke can display this information for you.

In-app purchases are available for reading more advanced sensors as well as a performance upgrade for fully unlocking our dynamometer (horsepower & torque reader) and a 1/4 mile analyzer.

DISCLAIMER: This app requires a third-party OBD2 adapter. Like most other applications, this app does NOT support ABS codes or proprietary commands.

What’s New

Version 6.4.0

- Added section under settings to allow selection of mix between metric and imperial units
- Dynometer and 1/4 mile results now displayed in configurable power and torque units according to settings

Ratings and Reviews

4.6 out of 5
572 Ratings

572 Ratings

InkyMyCat ,

Excellent App

I've been using this all on and off for a few years now. The author does keep it up to date with new bug fixes and features.

I wish this app would support the Bluetooth adapters. I did support the author and bought the app as well as future updates. Either way the app has paid for itself.

IvanTheMeh ,

So far the best OBD II app

I’ve tried several of these apps with my wifi OBD adapter. I’ve tried several in app purchases as well. So far this is the one that has given me what I needed. Much appreciated. Thanks for keeping it up to date! Worth the download and the in app purchase.

Tyson1947 ,

Must recommend

Detailed information and able to clear codes just download.
Purchased premium to access other features
Thank you creator for this awesome app

App Privacy

The developer, Mike Morawski, indicated that the app’s privacy practices may include handling of data as described below. For more information, see the developer’s privacy policy.

Data Not Linked to You

The following data may be collected but it is not linked to your identity:

  • Usage Data

Privacy practices may vary, for example, based on the features you use or your age. Learn More


  • Family Sharing

    With Family Sharing set up, up to six family members can use this app.

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