Obviously i know there are spreadsheet where you type in what coin you bought and what price and when you sold, but would it calculate the gain or loss automatically?
Are you asking for an app or something? Maybe if you say what you want or what you need it for, then it could be understood.
Otherwise, you don't need to bother yourself. If you buy a coin, you have excuted a business which you could either gain or lose and you know when that happens with your manual calculation.