I wrote the notes app of my dreams (no coding required)
fastcompany.com
fastcompany.com
That's too much and speaks poorly of both the tool he chose and the vibe approach. A more experienced programmer wouldn't have used $300 worth of credits building this.
His tool looks like a sticky note application with some Markdown inside. I'm pretty sure there are plugins that already can do this on Obsidian or any other text editor. It's funny to try to "vibe it" yourself but it's really useless in the long run since you'll be the one who will maintain it compared to the other projects with a good community behind.