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Fluent Reader vs Chaski: catalog facts
Fluent Reader	Chaski
Free Free and open source under a BSD 3-clause licence. The Microsoft Store and Mac App Store…	Free Free and open source under GPL-3.0.
Windows, macOS, Linux	Windows, macOS, Linux
Works fully locally, or syncs with Inoreader, Feedbin, Fever and Google Reader API services Regular expression rules that hide, mark read or star articles automatically as they arrive	Supports RSS and Atom feeds with automatic feed discovery Imports and exports OPML
Electron, so it is heavy for a feed reader The Microsoft Store version is recommended for auto-update; GitHub builds update manually	Offline availability depends on whether content can be downloaded
Downloadable app	Downloadable app
Open source	Open source
License: BSD-3-Clause	License: GPL-3.0
No account needed	Not stated if an account is needed
Works offline	Works offline
Official website Full listing and sources Checked September 21, 2026	Official website Full listing and sources Checked October 8, 2026

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