There are other apps of this type that are cross-platform (and I’ve used many of them in the last several years since finding Markdown), but none as polished, feature-rich, and syncable as Inkdrop. They also never fully met all of my needs. Some Mac-specific ones met my needs better, but then I was limited on my work environment. I primarily write tech notes and tutorials for clients, and I have finally found the app that meets all of my needs. I can now work on my work Mac, my personal Linux, my personal iPad, my clients’ Windows computers or virtual desktops and anywhere in-between on top of having the other features I need such as tables, image resizing, better list numbering, web links to let people preview my work before exporting to PDF, etc.
I also really appreciate how involved you are with the community Takuya-san, you are a rare breed of developer. Thank you so much for your work, I’m sorry it took me so long to find your app!