Reflecting on My Failure to Build a Billion-Dollar Company

> On top of that, our product ideas, like our credit card form and inline-checkout experience, have proliferated the web, ...

I've used Gumroad several years ago (as a customer), and the simplicity of the transaction and this interface was something refreshing.

You also say that you'd make Gumroad open source soon. May we know what the tech stack behind it is?

From their calls for part-time/contract devs, I think it's largely a Rails stack.