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Fluent Reader vs Vienna RSS: catalog facts
Fluent Reader	Vienna RSS
Free Free and open source under a BSD 3-clause licence. The Microsoft Store and Mac App Store…	Free Free and open source under the Apache licence.
Windows, macOS, Linux	macOS
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	Smart folders assemble articles from any feed by criteria you define Native Mac application rather than a web wrapper
Electron, so it is heavy for a feed reader The Microsoft Store version is recommended for auto-update; GitHub builds update manually	macOS only Sync support is limited compared with commercial readers
Downloadable app	Downloadable app
Open source	Open source
License: BSD-3-Clause	License: Apache-2.0
No account needed	Not stated if an account is needed
Works offline	Not stated if it works offline
Official website Full listing and sources Checked September 21, 2026	Official website Full listing and sources Checked September 22, 2026

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