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btdu vs compsize: catalog facts
btdu	compsize
Free Free to download from its public GitHub repository.	Free Free and open source under the GPL 2 or later.
Linux, Command line	Linux, Command line
Accounts for snapshots and shared extents Sampling gives quick results on large volumes	Shows real on-disk size of compressed Btrfs data Breaks results down by compression type
Works only on Btrfs Results are estimates that sharpen as sampling continues	Works only on Btrfs Infrequent updates, last change in December 2023
Downloadable app	Downloadable app
Closed source	Open source
License not stated	License: GPL-2.0-or-later
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 October 2, 2026

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