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Duc vs btdu: catalog facts
Duc	btdu
Free Free and open source.	Free Free to download from its public GitHub repository.
Linux, Command line	Linux, Command line
Scales to hundreds of millions of files Fast browsing from a stored index	Accounts for snapshots and shared extents Sampling gives quick results on large volumes
Results reflect the last index run, not live disk state Other systems need to build from source	Works only on Btrfs Results are estimates that sharpen as sampling continues
Downloadable app	Downloadable app
Open source	Closed source
License: LGPL-3.0	License not stated
No account needed	No account needed
Works offline	Works offline
Official website Full listing and sources Checked September 24, 2026	Official website Full listing and sources Checked October 2, 2026

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