FaceNotify is a free Android app developed by K4CZP3R that allows you to hide the content of your notifications and display it only when the app recognizes your face. This app is still in development, so not every phone is supported. However, it does support Custom ROMs (smart lock-based), OxygenOS, MIUI, and Samsung.

It is important to note that you must reboot your phone after the first setup; otherwise, the app may not work. If you don't have root access or don't know how to set up permissions, you can find detailed instructions on the developer's website.

Overall, FaceNotify is a useful app for those who want to keep their notifications private and secure. However, its limited compatibility may be a drawback for some users. For more information and to get support for your system/phone, visit the XDA-Thread of this app.