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RapidCRC Unicode vs GtkHash: catalog facts
RapidCRC Unicode	GtkHash
Free Free and open source under the GPL.	Free Free and open source under the GPL-2.0-or-later licence.
Windows	Linux
Multithreaded hashing with asynchronous I/O Unicode-aware SFV and checksum files	Supports MD5, SHA1, SHA2, SHA3 and BLAKE2 Graphical alternative to md5sum and sha256sum
Windows only Source code documentation is sparse	Checksums only, no signature verification described Plain GTK interface rather than a modern GNOME design
Downloadable app	Downloadable app
Open source	Open source
License: GPL-2.0	License: GPL-2.0-or-later
No account needed	Not stated if an account is 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

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