Leaflet is a free, cross-platform notes app developed by PotatoProject that offers advanced security features to keep your notes safe and secure. The app is designed with Material Design and offers a list/grid view for notes. It supports multiple note extras, including lists, images, and drawings.

One of the most interesting features of Leaflet is the ability to lock notes with a password, pin, or biometrics to ensure that your notes remain private. Additionally, you can hide notes content on the main page, so nobody can see the content of your notes without unlocking them. Furthermore, the app offers complete theme personalization, allowing you to customize the look and feel of the app to your liking.

Leaflet also offers search functionality with various filters and supports local backup/restore functionality with encryption. You can use tags to organize your notes and move them to trash or archive when you no longer need them. The app is completely open source, enabling you to propose changes, open issues, and clone the code from GitHub.

Overall, Leaflet is a fast, beautiful, and secure notes app with advanced features that make it stand out from other apps in the category.