iPhone Screenshots


FourStroke is a powerful tool that analyzes and displays real-time vehicle sensors and data through your vehicle's OBD-II port, a port standard on most vehicles across the world. Use of this app requires a compatible OBD-II Wifi Adapter. Our app is FREE to pull and clear engine codes along with most other functionality! FourStroke will work with any non-proprietary OBD Wireless adapter.

FourStroke can convert your iPhone 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 dynanometer (horsepower & torque reader) and a 1/4 mile analyzer.

DISCLAIMER: This app requires a third party OBD2 adapter. Please visit our website for details. Like most others this app does NOT support ABS codes or proprietary commands. Bluetooth adapters are not yet supported.

What’s New

Version 5.0.1

=== Version 5.0.1 ===
Fix for error reporting added

=== Version 5.0.0 ===
Massive code restructure in order to facilitate upcoming enhancements
Bug Fixes
- Fixed issue with gauges not reinitializing correctly on dashboard

Ratings and Reviews

4.5 out of 5
550 Ratings

550 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.

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

Lukeie-wise ,

I’m speechless.

I’m not kidding. Best OBD2 sensor app. Please download. Love the gauges a lot. Professional. Yet sleek looking. Fits right in with my sports car 😍 one downside is that I wanted to use it on a secondary phone but FourStroke is for IOS only :( maybe do something about that????


Mike Morawski
15.2 MB

Requires iOS 13.0 or later. Compatible with iPhone, iPad, and iPod touch.


English, Russian

Age Rating
In-App Purchases
  1. Sensor Upgrade Package $3.99
  2. Performance Upgrade $2.99


  • Family Sharing

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

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