Go here;
https://coinmarketcap.com/ and click on the tab that says "24HRS gainers"
That is very easy to see, and you do not need to be an expert to know how does it works, because anyone who has been in this community, or at least, trading with some altcoins really knows how to check those prices.
The biggest gainer of today was Minexcoin and NXT, they were the only ones from the top 100 that made more than 33% during today.
And cardano was probably the only coin who made more than 300% in just a week, it is going up like crazy at the moment.