Cloud Sticky Notes is a cross-platform tool that supports quick syncing of sticky notes between macOS/iOS. It supports creating an unlimited number of sticky notes (plus version), adjusting the font size of sticky notes at will and choosing the background colour.
Click on the third button from the left in the toolbar to place the notes in the menubar staging area.
The tool is also very customisable, with toolbar buttons to customise the tool, and the plus version allows quick syncing of sticky notes between macOS/iOS clients and the app.
