I was looking for a monitoring tool for my websites and SSL certificates. I knew there was a lot out there. But I always found them all too expensive. You pay for features you don't need. So I decided to build something of my own.
I didn't want to build a business product. I just wanted to build a small tool for myself and the whole thing in public, so that everyone could join in. The result was a little series about building PingPing.io.