Ginabot(a discordbot) : discord.gg/hHsRm8D is very good. She's very customizable and you can get a lot more information than updates. This is the one that I recommend just because of how much you can do with it.

If you are using android, theres partiko: https://play.google.com/store/apps/details?id=io.partiko.android. It gives notifications for upvotes and comments on your posts. Thats also pretty good, but is on android only(as of now).