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SeaMonkey vs Otter Browser: catalog facts
SeaMonkey	Otter Browser
Free The software is free under its open-source licence. Hosting, hardware and external…	Free The open-source software is available without a license fee. Hosting, hardware and…
Windows, macOS, Linux	Windows, Linux
It is the continuation of the old Mozilla Application Suite, so browsing, mail, news and page editing live…	Brings traditional desktop browser controls into a Qt application.
It tracks an older Firefox codebase, so web compatibility and security hardening trail the current browsers.	Some planned features remain unfinished.
Downloadable app	Downloadable app
Open source	Open source
License: MPL-2.0	License: GPL-3.0
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.