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GtkHash vs CalHash: catalog facts
GtkHash	CalHash
Free Free and open source under the GPL-2.0-or-later licence.	Free Free to use; the developer accepts donations.
Linux	macOS
Supports MD5, SHA1, SHA2, SHA3 and BLAKE2 Graphical alternative to md5sum and sha256sum	Calculates and compares checksums in a simple Mac interface Builds matched to each macOS release
Checksums only, no signature verification described Plain GTK interface rather than a modern GNOME design	macOS only Each build works only on its matching macOS version
Downloadable app	Downloadable app
Open source	Closed source
License: GPL-2.0-or-later	License not stated
Not stated if an account is needed	No account needed
Works offline	Works offline
Official website Full listing and sources Checked October 1, 2026	Official website Full listing and sources Checked October 2, 2026

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