Phone Keeper: Cleaner Booster is a free Android app developed by NBZ Co. Ltd. It belongs to the Utilities & Tools category and offers a range of features to help users manage their device.

The app allows users to search for temporary files, photos, and videos of apps and clean them up to free space on the device. It also has a malware scanner that can detect and remove malicious software from the device. Additionally, users can manage installed applications and get information about them, including permissions.

Phone Keeper: Cleaner Booster also provides users with a device speed measurement feature that compares their device's speed to other app users. Finally, users can protect their installed applications using a pattern key, adding an extra layer of security to their device.