Ask HN: What companies could be started on Zapier?

Pull Panda just got acquired by GitHub and at one point Abi was doing like $25k/mo in revenue. He mentioned in a talk about how the first version was built with Zapier. I wonder what else could be?

The links from his story are here: https://www.makerpad.co/blog/from-a-product-built-on-zapier-to-acquired-by-github