And it allows for swiping left and right to previously used apps. Plus the way it exposes the notificatin center is much more efficient than the stock way. There is another tweak that will give you the same effect though. I think it's called Flowtation. But I prefer Zephyr over that because of the additional swiping gestures it gives you. I would really hesitant to spend the $4.99 asking price for a few swiping gestures. But then I realized it was on sale for $2.99 and I purchased it. Knowing what I know now and how much I rely on Zephyr, I wouldn't hesitate to pay $5 for this tweak. When I was stock it took me foreverrrrrr to get out of the habit of swiping up to open the multitasking tray and to close apps. I was constantly swiping up to close apps. Man I love Zephyr hahaha. Apple really should steal Zephyr and implement an option in settings to navigate the device this way. It is extremely intuitive. For me, the intuitive tweaks are always my must have tweaks. They are the essence of what jailbreaking is all about in my opinion.