(Disclaimer: Not paid by Monosnap. Opinions below are my own.)
Requirement for my screenshot tool: (ordered by importance)
- universal shortcut: not application dependent but can be used anywhere within the computer to capture screenshots
 - layered annotation: annotations on screenshot can be modified even after adding different modifications on the screenshot
 - shareable: the shortest effort made to share a unique link of the screenshot
 - cross-platform: both PC and Mac need to be supported
 - short link: the software provides a short link like bit.ly
 - free: free version meets the above requirement
 - redaction for privacy: convenient access to redaction tool exists
 
- settings:
Things to improve