What are some alternatives?
When comparing FiveNotes and Thought Train, you can also consider the following products
FIPLAB MiniNote - Accessible notes app for Mac menubar.
Whimsical Sticky Notes - Visual project management using sticky notes
Jot menubar notes - Open-source freemium notes app for Mac menubar.
Todost - A beautiful, open-source to-do app ✍️
Quick Draft - A place to jot down a quick note or draft an email or text on the fly.
Sidenotes - Annotate the web.