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 availble for reading more advanced sensors as well as a performance unlock for a dynanometer (horsepower & torque reader) and a 1/4 mile analyzer (which is only partially limited for free users).

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. Bluetooth adapters are not supported.

What’s New

Version 4.0.2

=== Version 4.0.2 ===
Bug Fixes
- Fixed unselectable Gauge on 6 gauge dashboard

=== Version 4.0.1 ===
Bug Fixes
- Users unable to initiate purchases

=== Version 4.0.0 ===

Major Enhancements
-Rewritten UI to allow for landscape view

=== Version 3.1.0 ===

Minor Enhancements
-Added new sensor 'Intake Manifold Boost Pressure'
-Added clarification on App's abilities for code clearing
-Simulated ECU now shown as different icon on home screen
-Added additional gauge screens

Bug Fixes
-Iphone X home bar no longer covers dyno results
-Table headers no longer become hard to read after scrolling

=== Version 3.0.1 ===

Major Enhancements

Performance section added
-1/4 Mile Run

iPhone X Compatibility

Minor Enhancements

Added option to allow forcing English language
Error code detail screen links to third party website for further details
Added code lookup feature
Gauge value overrides now allow negative numbers

Ratings and Reviews

4.5 out of 5
341 Ratings
341 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
39.3 MB

Requires iOS 10.0 or later. Compatible with iPhone, iPad, and iPod touch.


English, Russian

Age Rating
Rated 4+
© 2018 Mike Morawski
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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