Another alternative to the stock app switcher is Gestr tweak. Instead of double clicking your home button and select an app, you can assign gestures to any app you want as a shortcut. Once you perform a gesture for a particular app anywhere on the iOS, that app will open up accordingly.
Once installed, you can assign as many gesture as you want to each app as long as you remember the gestures. It doesn’t add any preference pane in the Settings menu, but you are required to assign the Gestr tweak to an activator move. Once on the home screen and perform the activator move to activate Gestr, you’ll get a message that you need to assign gestures to a particular app.
To do this open any app you want to assign a gesture, perform the activator action you have assigned to Gestr, and you will see such interface as below:
Suppose, you want to assign a gesture for camera application so we can access the camera from anywhere. Open the camera application, perform the activator action and the interface (as seen in the picture above) will show up. We assign a gesture “L” by drawing the “L” in the given space and click the assign button on the top. So now, if we want to access the camera application from anywhere, just perform the activator action, then draw the “L” shape and there you go, you have just landed on the camera page.
As said earlier, you can assign as many gestures as you want to any application but on the condition you remember them. This is a great tweak in an event of multi-tasking. If you want to give it a try, it is available in Cydia for $1.49.
Here is our short video tutorial on Gestr: