Hello,

I'm searching for an app that could launch another app when you launch an app

I would call that "sync app launch"
Inside this app: you can choose to launch app2 (and app3 if you want) when app1 is launched by user
If app close can be syncing too it would be great

Typical example:
When I launch a GPS app, I would like the radar detector app to be launched at the same time, and closed when I close GPS app

Does someone know something like this?

Thanks!

Answer: Tasker
https://market.android.com/details?id=n ... XNrZXJtIl0.