Clover's Surface seems like a grown-up, slick version of what I was trying to achieve on my own. So I'm really pleased you're making a business out of it. And it's a desktop app!
I wish Apple hadn't ditched the whole OpenDoc thing - it'd be so good to draw a frame and have that frame be, say, an Affinity Designer document that you could edit directly in the Surface. (A bit like OLE with an Excel sheet in a Word doc in the old days on Windows.) This feels like such an amazing organizational model for complex, multi-tool, project-based work. At least, that's how I'll use it. But this is only 2 minutes into my use of the product...
Congrats, it's great. And the price is attractive too - this is one I really hope I end up subscribing to as I go through the trial.