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Vienna RSS vs Lettura: catalog facts
Vienna RSS	Lettura
Free Free and open source under the Apache licence.	Free Free and open source.
macOS	Windows, macOS, Linux
Smart folders assemble articles from any feed by criteria you define Native Mac application rather than a web wrapper	Standalone desktop app built with Tauri Free and open source with active development
macOS only Sync support is limited compared with commercial readers	Documentation is mostly in the GitHub repository No mobile app
Downloadable app	Downloadable app
Open source	Open source
License: Apache-2.0	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 September 22, 2026	Official website Full listing and sources Checked September 23, 2026

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