What are some portable devices that smart phones haven't replaced?

I've been very stressed lately and have been doing some window shopping to calm down. I'm interested in gadgets, but a lot of things can just be replaced with apps. I realize a phone won't replace very large appliances like refrigerators or washing machines so I'm trying to scope my question to portable devices. So what are some portable devices or gadgets that their specialization hasn't been replaced by smart phone apps? Extra points if they're super useful and reliable.