I’m starting a project to automatically take screenshots of a bunch of web pages. I want to compare how those pages change over time.

Years ago, I imagined a simpler version of this project and even registered uihop.com, intending to build a service around it. Later, at Yammer, Brendan McKeon impressed the whole company with the many uses of his "time machine". His work inspired me, and I was bummed that the technology wasn’t available to more designers.

For now, I’ve built a simple action that runs Puppeteer in a Docker container and reads a configuration file containing viewport sizes and URLs.