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btdu vs Duc: catalog facts
btdu	Duc
Free Free to download from its public GitHub repository.	Free Free and open source.
Linux, Command line	Linux, Command line
Accounts for snapshots and shared extents Sampling gives quick results on large volumes	Scales to hundreds of millions of files Fast browsing from a stored index
Works only on Btrfs Results are estimates that sharpen as sampling continues	Results reflect the last index run, not live disk state Other systems need to build from source
Downloadable app	Downloadable app
Closed source	Open source
License not stated	License: LGPL-3.0
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 24, 2026

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