open food/beauty facts: both have a long way to go IMO. The ui is very janky and lots of things don’t work. Open food facts seems to be a bit better but not much
loop habit tracker: fantastic app, I use it every day, never saw a bug
gadgetbridge: the ui seems rudimentary, but it has everything you need and it works really well. YMMV depending on which gadget you have though
openscale: only used it for manual tracking. It’s very very basic but somehow I didn’t find a better alternative
I have some experience with some of these apps: