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QuickViewer vs ParaPara: catalog facts
QuickViewer	ParaPara
Free Free software under GPLv3.	Free Free and open source under GPL-3.0.
Windows, macOS, Linux	Linux
Opens image archives directly Supports two-page comic viewing	Single, two-page spread, and continuous viewing modes Supports right-to-left and left-to-right page turning
Linux users need to build QuickViewer from source.	Available for Linux.
Downloadable app	Downloadable app
Open source	Open source
License: GPL-3.0-only	License: GPL-3.0
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 October 8, 2026	Official website Full listing and sources Checked October 8, 2026

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