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Vienna RSS vs RSS Guard: catalog facts
Vienna RSS	RSS Guard
Free Free and open source under the Apache licence.	Free Free and open source under the GPL 3.0.
macOS	Windows, macOS, Linux
Smart folders assemble articles from any feed by criteria you define Native Mac application rather than a web wrapper	Client for Feedly, Inoreader, FreshRSS, Miniflux, Nextcloud News and more Built-in mpv-based podcast player for audio and video
macOS only Sync support is limited compared with commercial readers	The interface exposes a great deal at once A desktop program, so there is no syncing unless you use a service account
Downloadable app	Downloadable app
Open source	Open source
License: Apache-2.0	License: GPL-3.0
Not stated if an account is needed	No account needed
Not stated if it works offline	Works offline
Official website Full listing and sources Checked September 22, 2026	Official website Full listing and sources Checked September 21, 2026

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