OBSIDIAN

Obsidian is a private and flexible writing app that adapts to your way of thinking. It is designed for users who want to keep their thoughts and ideas organized and secure. The app stores notes on your device and offers hundreds of plugins and themes for individual customization. It uses open, non-proprietary files to ensure long-term data backup. Obsidian is free for personal use. There is also a paid version with additional features such as synchronization, version history, and collaboration. Prices start at $4 per month.