I built a $15k Mac app for a random Reddit user

This is a sales post in disguise.

Aren't you supposed to ask the question on this part of HN?

Any submission without a link ends up in Ask. It's just kind of how it works, you don't have to specify that you want it to land in AskHN.

Nice App, nice video! Would you mind sharing more about how you notice the idea? That would be a more attractive story.

(PS: Your homepage misses a H1 tag, which is not SEO best practice)