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ReadKit vs Vienna RSS: catalog facts
ReadKit	Vienna RSS
Freemium Pricing is not listed on the website; see the App Store page.	Free Free and open source under the Apache licence.
macOS, iOS	macOS
Syncs with many RSS and read-later services Built-in RSS engine needs no external service	Smart folders assemble articles from any feed by criteria you define Native Mac application rather than a web wrapper
Apple platforms only Pricing details not shown on the website	macOS only Sync support is limited compared with commercial readers
Downloadable app	Downloadable app
Closed source	Open source
License not stated	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 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.