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RapidCRC Unicode vs CalHash: catalog facts
RapidCRC Unicode	CalHash
Free Free and open source under the GPL.	Free Free to use; the developer accepts donations.
Windows	macOS
Multithreaded hashing with asynchronous I/O Unicode-aware SFV and checksum files	Calculates and compares checksums in a simple Mac interface Builds matched to each macOS release
Windows only Source code documentation is sparse	macOS only Each build works only on its matching macOS version
Downloadable app	Downloadable app
Open source	Closed source
License: GPL-2.0	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.