Catsup, a grocery list app, by Zhenyi Tan

Zhenyi Tan, writing about the inspiration for Catsup, his grocery list app, on his personal blog: I think a grocery app should be designed differently from a todo list app. Forever ago, I saw this physical grocery list on Reddit, supposedly from the 1950s. And I was like, that’s it. That’s how a grocery list should work. I bought Catsup as quickly as I possibly could.