I use Adobe Scan to scan stuff: receipts, handwritten notes, mail to save, etc. Source: almost 3 years ago

Use a PDF scanner app on your phone. However, do NOT use iOS Notes' scanning function. I recommend Adobe Scan, as it eases the process of converting the PDF into an image file. Source: about 3 years ago

Both the Adobe Scan and Microsoft Lens scanner apps work really well: https://acrobat.adobe.com/us/en/mobile/scanner-app.html. Source: about 3 years ago

Can also be used in non-KDE X11 desktop environments. Which doesn't really explicitly say much, and in fact the only tool I could find that claimed to be able to support everything was ksnip, which seems to work fine with wlroots but beyond that https://github.com/ksnip/ksnip#known-issues outlines the situation well enough; KDE is at least only temporarily... - Source: Hacker News / 6 months ago

Ksnip is a simple and efficient cross-platform screenshot tool with all the essential annotation features. Whatsek raves, "Try ksnip! Went from greenshot to share, way too many features, found ksnip. Tabs... Awesome!". Source: 12 months ago

Otherwise, the simplest solution is probably to either stick to the older Spectacle versions or use another screenshot tool like Flameshot or ksnip. Source: about 1 year ago

Ksnip - screenshot tool with annotation features. https://github.com/ksnip/ksnip. Source: about 1 year ago

Ksnip is a cross-platform screenshot and annotation tool. Source: over 1 year ago