The author initially used Simplenote and Obsidian for note-taking but sought a replacement for Simplenote due to its restrictive simplicity. They discovered Notesnook, which became their preferred app due to its end-to-end encryption, generous free plan, and offline functionality. Notesnook supports rich-media attachments, offers organizational features like notebooks and sub-notebooks, and provides superior text formatting options compared to Simplenote. However, the author noted some drawbacks, including slower speed, lack of full Markdown support without a paid plan, local revision history that doesn't sync across devices, and missing collaboration features. Despite these drawbacks, the author appreciates Notesnook's versatility but continues to use Obsidian for its strengths in managing databases and knowledge bases.