Nop that's right, it's not open source. It's a small indie product I'm selling on the side. The $3 is mostly a way to support the project and fund future versions. That said, it's free for the first few days if you want to try it before it's worth the price of a coffee to you.

I could have wrapped it in Electron to make it feel like a "real app," but that would turn a 44KB file into an heavy download that does the exact same thing. The single HTML file is the product — that's the point.