A free app for Android, by Pocket Playground.
Tune It Yourself is a tool for tuning the suspension and gearing of a car using the data gathered during a race. It connects with the game you are racing in and collects live data from your car as you race. This allows Tune It Yourself to automatically adjust your base tunes using the data gathered from your time on the track to tailor the suspension and gearing setups for both the car and the track it is on.
The trial version of this app allows the user to tune the Radical SR8 on any track in Forza Motorsport 7, the 1993 Skyline GT-R VSPEC in Forza Horizon 4, or the 1992 Ford Escort RS Cosworth in Forza Horizon 5.