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NetNewsWire vs Vienna RSS: catalog facts
NetNewsWire	Vienna RSS
Free The open-source application is available without a license fee.	Free Free and open source under the Apache licence.
macOS, iOS	macOS
Completely free and open source with no account required Native Apple app with iCloud sync and many back-end options	Smart folders assemble articles from any feed by criteria you define Native Mac application rather than a web wrapper
Apple platforms only Deliberately restrained feature set with no filtering or rules	macOS only Sync support is limited compared with commercial readers
Downloadable app	Downloadable app
Open source	Open source
License: MIT	License: Apache-2.0
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.