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Vienna RSS vs Fluent Reader: catalog facts
Vienna RSS	Fluent Reader
Free Free and open source under the Apache licence.	Free Free and open source under a BSD 3-clause licence. The Microsoft Store and Mac App Store…
macOS	Windows, macOS, Linux
Smart folders assemble articles from any feed by criteria you define Native Mac application rather than a web wrapper	Works fully locally, or syncs with Inoreader, Feedbin, Fever and Google Reader API services Regular expression rules that hide, mark read or star articles automatically as they arrive
macOS only Sync support is limited compared with commercial readers	Electron, so it is heavy for a feed reader The Microsoft Store version is recommended for auto-update; GitHub builds update manually
Downloadable app	Downloadable app
Open source	Open source
License: Apache-2.0	License: BSD-3-Clause
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.