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ComicReaderUltimate vs OpenComic: catalog facts
ComicReaderUltimate	OpenComic
Free Free to use; the repository lists a CC-BY-NC-ND-4.0 license, which is not an OSI-approved…	Free Free to download, with an optional donation page.
Windows, macOS, Linux	Windows, macOS, Linux
Supports single pages, double pages, and continuous scrolling GPU-accelerated rendering	High-quality Lanczos3 downscaling for sharp pages Reading view customizable for comics and manga
Always runs fullscreen and has a limited GUI Does not include a library browser	ePub and PDF support is basic Focused on reading rather than library management
Downloadable app	Downloadable app
Closed source	Open source
License: CC-BY-NC-ND-4.0	License: GPL-3.0
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 October 8, 2026	Official website Full listing and sources Checked October 1, 2026

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