When I was playing an economics game I was building a lot of simple nocode Google spreadsheets with a little bit of JavaScript to import data. You could share your spreadsheets among friends and everyone made their own copy which they modified to suit their own needs.

I thought about some very trivial apps that are worth building but not worth the cost of the usual stacks. We are talking about the equivalent of a simple desktop app that doesn't need hosting except you don't want to use the local filesystem because you want to synchronize your data between devices. The actual app could be a simple SPA. It doesn't matter how it is implemented. What I am missing is the storage concept. There is remoteStorage.js but nobody adopted it.