Coinscalender is the best one to me. I'm following that sites for a while now. You can create alert for ypur selected coins even if you want and you will receive notification through email.
If you are talking about price rise and fall notifications then go to playstore and download blockfolio app
OP isn't looking for such app. There are coin calendar which shares all the events from different projects like change to mainnet, partnership, listing etc which can cause a short term price pump.