Isn’t the sane solution to just generally have an idea what’s in there, and take a look if you’re not sure?

Trust me, if "just remember it" worked for me, many things about my life would be different. Not just the whiteboard on the fridge.

Then remember to carry that whiteboard with you just in case you get off work early and decide to hit the grocery store.

Good thing the grocery store gives me a piece of paper with a list of the things I bought.

I really don't think the pain point is at home managing inventory, it's when you're at the store and want to now what you have. Receipts aren't going to help you when perusing the isles unless you have a very strange shopping flow.

I make my shopping lists at home. I base my shopping lists on what I already have, and what I want to cook this week. Pretty reasonable, I think.

Because I have a shopping list, I don't need to remember what I have in the fridge while I'm in the grocery store. I buy the things I need, and I leave.

The grocery list goes in Todoist, by the way. In case you were afraid that there was an aspect of my life with no apps involved.

Obviously the sane solution is to put a webcam inside your fridge