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Szyszka vs Stencil: catalog facts
Szyszka	Stencil
Free Free and open source under the MIT licence.	Free Free and open source under the GPL-3.0-or-later licence.
Windows, macOS, Linux	macOS, Linux
Multiple renaming rules that can be combined Fast with large numbers of files	Native apps for both GNOME and macOS Combinable list of rename operations
Development is infrequent GTK interface feels out of place outside Linux	No Windows version Small project with a single main developer
Downloadable app	Downloadable app
Open source	Open source
License: MIT	License: GPL-3.0-or-later
No account 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 1, 2026

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