Compare software

nb vs zk: catalog facts
nb	zk
Free Free and open source.	Free Free to download and use from GitHub.
Windows, macOS, Linux, Command line	Command line
Plain text notes with Git-backed versioning and sync Bookmarking and archiving alongside notes	Notes stay as plain Markdown files Works with any text editor
Terminal-first workflow; the web interface runs locally Windows needs WSL, MSYS or Cygwin	Command-line only, no graphical interface Assumes comfort with the terminal
Downloadable app	Downloadable app
Open source	Closed source
License: AGPL-3.0	License not stated
No account needed	No account needed
Works offline	Works offline
Official website Full listing and sources Checked September 23, 2026	Official website Full listing and sources Checked September 24, 2026

Catalog facts only. Anything “not stated” is unconfirmed. Check full listings for details.