Hail is a free Android app developed by purofle that helps optimize your device's performance by forbidding apps when they are not in use. This app helps cut down the usage of RAM and save power, resulting in better device performance. Hail offers two ways to "freeze" apps - Hide and Disable. Hidden apps will not be shown in the launcher and the installed app list, but can be unhidden to revert. Disabled apps will not be shown in the launcher, but can be enabled to revert.

With Hail, you can enjoy a smooth and seamless experience on your Android device, without worrying about apps running in the background and draining battery life. It is a useful tool for those who want to optimize their device's performance and extend their battery life. Hail is available for free and can be downloaded from the Google Play Store.