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Name Mangler vs Stencil: catalog facts
Name Mangler	Stencil
Paid 19 USD with a free trial; upgrades cost 9 USD, and it is also on the Mac App…	Free Free and open source under the GPL-3.0-or-later licence.
macOS	macOS, Linux
Preview of new filenames before renaming Fast on very large batches	Native apps for both GNOME and macOS Combinable list of rename operations
Mac only Paid licence after the trial	No Windows version Small project with a single main developer
Downloadable app	Downloadable app
Closed source	Open source
License not stated	License: GPL-3.0-or-later
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 1, 2026

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