I use the Notes app in iOS/OSX which has been getting insanely powerful in the last few years. Not only does it sync notes across devices, but indexes them for

I use the Notes app in iOS/OSX which has been getting insanely powerful in the last few years. Not only does it sync notes across devices, but indexes them for spotlight search anywhere. It also transcribes handwritten notes and makes them searchable, as well as scanned documents like receipts and business cards. Attaching photos, hand-drawn diagrams, tables, checklists and formatted text are simple. Notes can be hierarchically organized into a folder structure (work, blog, 1:1s, ideas etc.) and locked for privacy (1:1s, performance reviews, holiday gifts etc.). They support sharing and basic collaborative editing too. Notes seems so simple on the surface, but every time I use it I am delighted to find power-user features throughout. My #1 feature request would be code blocks with syntax highlighting. It supports monospaced blockes for now. Perhaps even better would be if it would detect, accept and render markdown formatting. Until then, a simple trick I use is: copy the RTF text from Notes into a GIST. It auto-converts to MD.