is there an app where you can input your balance just for tracking purposes? Thanks!
I think what OP is asking is for a simple portfolio tracking app to monitor the value of his coins in fiat, as opposed to all the suggestions so far involving watch only wallets or wallet tracking apps.
I would suggest Delta -
https://delta.app/It's available for both Android and Apple, and has recently been updated to include not just cryptocurrencies but also stocks, ETFs, indices, futures, and so on. You simply input your balances and the app will track their value in your choice of fiat. You can generate various graphs and tracking information, as well as set notifications regarding price targets or movements.