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JARR vs RSSMonster: catalog facts
JARR	RSSMonster
Free Free and open source under the AGPL-3.0.	Free Free to self-host with published source code.
Web, Self-hosted	Web, Self-hosted
Three-column reading interface in the browser Folders for categories and a view of feeds with errors	Familiar three-pane reading layout Smart folders and search
Documentation on the homepage is an older introduction post Small project with a small community	Requires running your own server and database Smaller community than older self-hosted readers
Self-hosted	Self-hosted
Open source	Open source
License: AGPL-3.0	License not stated
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 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.