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ncdu vs Duc: catalog facts
ncdu	Duc
Free Free and open source under an MIT-style licence.	Free Free and open source.
macOS, Linux, Command line	Linux, Command line
Works over SSH on a server with no graphical environment Parallel scanning with -t8 is much faster on large trees	Scales to hundreds of millions of files Fast browsing from a stored index
No Windows build Colours are off by default because they were not legible in all terminals	Results reflect the last index run, not live disk state Other systems need to build from source
Downloadable app	Downloadable app
Open source	Open source
License: MIT	License: LGPL-3.0
No account needed	No account needed
Works offline	Works offline
Official website Full listing and sources Checked September 21, 2026	Official website Full listing and sources Checked September 24, 2026

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