This is the iOS counterpart of the Herald macOS app. Use it to receive push notifications when your tasks finish!
Do you ever sit around waiting for a download (or upload) to finish, a video to render, an email to arrive... well wait no more!
Herald for macOS will watch for changes or text to appear in a chosen window and alert you so that you can get on with something else. Simply drag the red rectangle over the area that will change (or stop changing, in the case of spinners) and Herald will do the rest.
And for the developers out there: you can pipe commands into the Herald CLI app and get notified when a certain string is printed to stdout or when the command ends (enabled CLI mode in Heralds preferences).