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ksnip vs Markup Hero: catalog facts
ksnip	Markup Hero
Free Free and open source under the GPL 3.0.	Free Described by the developer as free.
Windows, macOS, Linux	Windows, macOS, Linux, Web
Works on Wayland as well as X11 Numbered markers, blur and pixelate for writing instructions safely	Annotates screenshots, images, PDFs and websites Shareable links to annotated items
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	Sharing depends on the developer's hosted service Closed source
Downloadable app	Downloadable app, Web application
Open source	Closed source
License: GPL-3.0	License not stated
No account needed	Not stated if an account is needed
Works offline	Not stated if it works offline
Official website Full listing and sources Checked September 21, 2026	Official website Full listing and sources Checked September 24, 2026

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