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Otter Browser vs Pale Moon: catalog facts
Otter Browser	Pale Moon
Free The open-source software is available without a license fee. Hosting, hardware and…	Free The software is free under its open-source licence. Hosting, hardware and external…
Windows, Linux	Windows, macOS, Linux
Brings traditional desktop browser controls into a Qt application.	It keeps the pre-Quantum Gecko engine and the old XUL extension model, so add-ons that Firefox dropped still…
Some planned features remain unfinished.	The source is MPL but the official binaries carry a separate branding licence, and its older engine misses…
Downloadable app	Downloadable app
Open source	Open source
License: GPL-3.0	License: MPL-2.0
Not stated if an account is needed	Not stated if an account is needed
Not stated if it works offline	Not stated if it works offline
Official website Full listing and sources Checked September 22, 2026	Official website Full listing and sources Checked September 22, 2026

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