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I played around for a few minutes and I'm somewhat surprised that I like it (because on page-load it looks the same as Excalidraw or Miro or the others).
- Small number of shapes is good. I like that "database" and "server" are there, because I'd be using this for software architecture diagrams and I don't want an overwhelming number of shapes.
- The map in the lower left works quite well. I should try it on something big enough to need it.
- The note is just basic text. All the other apps I've used make the text scale to fill the note and I hate that.
- Some things are sticky (arrows, freehand) while others are not (shapes). This is surprising and I'm not sure how I feel about it, but it may be the correct choice.
- The AI isn't popping up in my god-damn face. I really don't want "help" with drawing.
- Export as Mermaid is very interesting-looking.
The sticky/nonsticky buttons are the only maybe-criticism I've got after a quick peek, but I liked it quite a bit and will try using it for real. The export options are important because they make me feel like I won't lose my work if you get bored or forget to pay a bill. :-)