I dont know what are you looking for, but if you are looking for a platform in where you can do technical analysis while you trade, then the best thing that you can do is just do it on the broker that you are using..
Or just download metatrader and start doing your analysis in there, it is probably the most complete software to make a track of all your open trades.
But i am not aware if they really have the option to keep the track of al the altcoins who are under the radar (the newbie's ones)
In your opinion, which are the most complete platforms to do technical analysis in cryptocurrencies
If you want to do it on the internet, then just use tradingview.