If that doesnt suit you, our users have ranked more than 50 alternatives to Stickies and many of them are available for Mac so hopefully you can find a suitable replacement. Its not free, so if youre looking for a free alternative, you could try Microsoft To Do or Trilium Notes.
(Keep your notes and ideas organized by topic or under parent headings) With To-Do Stickies you can be more organized and productive. To-Do Stickies is a tool specially designed to help you plan projects, brainstorm, quickly jot down notes, organize them by topics, and track progress by checking off completed tasks. Use it a LOT for simple notes and reminders. Also, a bold/italics/underline option would be great. Don't get stuck spinning your wheels while working on projects and brainstorming new ideas. 2) Option to change font size within notes (mainly to add headings/tiltes to sub-sections within a note, but there would be other uses.