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btdu vs ncdu: catalog facts
btdu	ncdu
Free Free to download from its public GitHub repository.	Free Free and open source under an MIT-style licence.
Linux, Command line	macOS, Linux, Command line
Accounts for snapshots and shared extents Sampling gives quick results on large volumes	Works over SSH on a server with no graphical environment Parallel scanning with -t8 is much faster on large trees
Works only on Btrfs Results are estimates that sharpen as sampling continues	No Windows build Colours are off by default because they were not legible in all terminals
Downloadable app	Downloadable app
Closed source	Open source
License not stated	License: MIT
No account needed	No account needed
Works offline	Works offline
Official website Full listing and sources Checked October 2, 2026	Official website Full listing and sources Checked September 21, 2026

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