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ncdu vs btdu: catalog facts
ncdu	btdu
Free Free and open source under an MIT-style licence.	Free Free to download from its public GitHub repository.
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	Accounts for snapshots and shared extents Sampling gives quick results on large volumes
No Windows build Colours are off by default because they were not legible in all terminals	Works only on Btrfs Results are estimates that sharpen as sampling continues
Downloadable app	Downloadable app
Open source	Closed source
License: MIT	License not stated
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 October 2, 2026

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