Partiko is great for notifications! It's a steem app for your phone that has a points-based system. Every time you upvote, comment or post, you get points, and when you have accrued enough points you can opt to use those points for an upvote from Partiko. :)

I really only use it when I'm in bed or out-and-about, and not for posting, just for voting and commenting. But the notifications are useful! There's also @ginabot on Discord, but that requires a bit of setting up. I have that on my phone too so whenever something happens on Steem I usually get double-beeped.👀🤪 Drives my partner crazy. Especially when I forget to put my phone on silent before bed. 😂