I've decided that I just want to go with a pure grocery list app that doesn't have anything extra, so I tested a few apps. I ended up with listonic and we've been using it for over a year now. Maybe it's what you're looking for!
Speaking of which, is/will there be a way of transferring your sync for reddit payment over to the lemmy app? I bought it like half a year ago. Understandable if I have to re-buy it, but figured asking won't hurt.
I'm using the opinionated and self-hosted reader Miniflux in combination with a browser plugin for Chrome. This way I see the amount of unread RSS items and I can either click them to open them or just mark them as read. Not sure if it's for everyone, but I like it a lot :) Just figured it should get a mention here.
He's active on Tildes and said just a week ago that he doesn't have another one of those plugins like RES in him :)