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b3sum vs HashVerifier: catalog facts
b3sum	HashVerifier
Free Free and open source, dual-licensed under CC0 and Apache 2.0.	Free Free and open source under the MIT licence.
Windows, Command line	Linux, Command line
Familiar sha256sum-style interface BLAKE3 hashing is fast on large files	Both CLI and GTK3 interfaces Recursive checksum generation for whole directories
BLAKE3 checksums are less widely published than SHA-256 ones No prebuilt releases on the GitHub repository	Small project with few contributors GTK3 interface looks best on Linux desktops
Downloadable app	Downloadable app
Open source	Open source
License: CC0-1.0 OR Apache-2.0	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 October 1, 2026

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