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grepWin vs MassReplaceIt: catalog facts
grepWin	MassReplaceIt
Free Free and open source under the GPL-3.0 licence.	Free Free to use, with optional donations.
Windows	macOS
Regular expression search and replace across many files Explorer context menu entry for quick searches	Previews changes and can undo earlier searches Works on both file contents and filenames
Windows only Requires Windows 10 22H2 or later	macOS only Closed source
Downloadable app	Downloadable app
Open source	Closed source
License: GPL-3.0	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.