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Stencil vs Name Mangler: catalog facts
Stencil	Name Mangler
Free Free and open source under the GPL-3.0-or-later licence.	Paid 19 USD with a free trial; upgrades cost 9 USD, and it is also on the Mac App…
macOS, Linux	macOS
Native apps for both GNOME and macOS Combinable list of rename operations	Preview of new filenames before renaming Fast on very large batches
No Windows version Small project with a single main developer	Mac only Paid licence after the trial
Downloadable app	Downloadable app
Open source	Closed source
License: GPL-3.0-or-later	License not stated
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 2, 2026

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