You can easily correlate various instruments in real time on TradingView. I’d done it with some funds while doing some intermarket analysis in this post here. You can also customize the correlation period, as demonstrated.
You can give it a go and see if it fits your requirements.
I haven’t heard of anyone using it for real time trading scalping or intraday. I’ve seen it used strictly for analysis on much larger time frames in 2 different books. They were used to determine market environments and the general direction certain instruments moved.