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Lettura vs Vienna RSS: catalog facts
Lettura	Vienna RSS
Free Free and open source.	Free Free and open source under the Apache licence.
Windows, macOS, Linux	macOS
Standalone desktop app built with Tauri Free and open source with active development	Smart folders assemble articles from any feed by criteria you define Native Mac application rather than a web wrapper
Documentation is mostly in the GitHub repository No mobile app	macOS only Sync support is limited compared with commercial readers
Downloadable app	Downloadable app
Open source	Open source
License not stated	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 23, 2026	Official website Full listing and sources Checked September 22, 2026

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