App Crumb allows you to take the app you came from with you.

Usually when switching to another app you have a "go back" button in the status bar. So you have to make a decision which app you focus on - the current one or the one you came from.

App Crumb solves this issue by bringing the app you came from with you in a neat little window at the bottom. You can swipe on it to change its side of the screen and you can resize it to view it on a larger scale.

You can tap on the app view to go back to it like a normal breadcrumb.

If you need to interact with the app, you can double tap on the view and you get into interaction mode. Interaction Mode allows you to fully interact with the app you came from.

You can either exit the interaction mode through the home button or by tapping its background.

Settings

In Settings you can also disable apps which you do not want App Crumb to handle. Those will show default breadcrumbs in the status bar if you switch from them to another app.