But I'm not sure it's what OP is after. The requirements are:
> Phone notifications (so I don’t miss calls/ texts)
> Step counting
> A long battery life
Bangle.js doesn't connect to your phone at all, so you won't get any phone notifications. I don't personally use step counting, but when I have tried it I found it didn't work very well. Maybe that's just me.
The battery life depends a lot on what you're doing. In particular, clock faces that show seconds (i.e. have to wake up the CPU every second) drain the battery faster than clock faces that only go down to minutes. It still easily lasts longer than a day, which is good enough for me. I just charge mine overnight.