Try Blockfolio, you can set up price alerts, check charts, book, your positions, pretty good app to follow your crypto portfolio.
Blockfolio is the best choice for you.
I use it daily to track the prices.
Block folio is too slow
Its not slow actually since ive been using Blockfolio since it was being launched and I do really like its features and I can easily read up recent prices of the coins do I hold. I didn't know other price alert app since ive been using this thing ever since and I don't have problem at all loading times are just fine for me and its not slow maybe theres a problem on your phone or internet connection.