I agree with LibreCalc and CSV, in some internationalclasses we always had issues with excel saving CSV in actually different formats depending on the machine locale. LibreCalc never had this problem.

I am currently using Mealie with docker, which being a containers noob seemed easier to setup compared to Tandoor. I have it behind tailscale as well.

Mealie works well for what I need to do, I don’t plan in advance yet, but I just import recipes and it works 9 out 10. I will need to try the shopping list features sooner or later.

There is no mobile app that I am aware of but the webpage works perfectly on mobile with a bookmark.