I bought a piece of 1.5 inch stiff foam to try to fix a sag in a bed. It didn’t work but having that thick piece of solid foam around has been a life saver.
Need something flat to put a laptop on? Throw it on the foam. Going to be doing something that requires you to be on your knees for a while? Get the foam!
It went from stupid purchase to something I’d gladly replace if it broke.
You only need the app to set your preferred temperature and led colour. Once that’s done you can forget about it and even uninstall if you want to.
In my experience, you need the app if you use a valved filter (i.e. Clever Dripper) as being a little cooler, the Ember mug doesn’t trigger the heating, and you have to tell the app to increase the temperature manually until it realises there’s a hot drink in there.