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