I tried Grocy for a while, but eventually stopped. Data entry was a huge pain.
Using the iOS companion app to scan grocery items into the app resulted in data issues that prevented me updating the item in the web app later. The only recourse was to add the items by hand in the web app, but then go in to each one separately with the mobile app to register the barcode. This also resulted in losing the additional metadata about the products that the mobile app would automatically configure if you onboarded the items through the mobile app, as it was able to look up additional data online and prefill a lot of stuff.
At the end of the day, it was too much of a hassle. I do like the idea, and may come back to Grocy again, but for now I have to pass.
Nettle tea is delicious.