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Markup Hero vs ksnip: catalog facts
Markup Hero	ksnip
Free Described by the developer as free.	Free Free and open source under the GPL 3.0.
Windows, macOS, Linux, Web	Windows, macOS, Linux
Annotates screenshots, images, PDFs and websites Shareable links to annotated items	Works on Wayland as well as X11 Numbered markers, blur and pixelate for writing instructions safely
Sharing depends on the developer's hosted service Closed source	The author has asked for a co-maintainer, so the future is uncertain Releases are slow; 1.10.1 on GitHub dates from March 2023
Downloadable app, Web application	Downloadable app
Closed source	Open source
License not stated	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 September 24, 2026	Official website Full listing and sources Checked September 21, 2026

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