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Vienna RSS vs ReadKit: catalog facts
Vienna RSS	ReadKit
Free Free and open source under the Apache licence.	Freemium Pricing is not listed on the website; see the App Store page.
macOS	macOS, iOS
Smart folders assemble articles from any feed by criteria you define Native Mac application rather than a web wrapper	Syncs with many RSS and read-later services Built-in RSS engine needs no external service
macOS only Sync support is limited compared with commercial readers	Apple platforms only Pricing details not shown on the website
Downloadable app	Downloadable app
Open source	Closed source
License: Apache-2.0	License not stated
Not stated if an account is needed	No account needed
Not stated if it works offline	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.