Funny you should say that Jonnyy40 because I'm thinking the same thing.
I'm with IG and trialled D4F's software for 2 wks running them both together.
I noticed that they don't keep in step (I looked at Dow only though). I did random paper trades with both, opening and closing at the same time. You would have thought that D4F would give a 3 pt better profit. NOT necessarily, it depended totally on when you opened and closed the positions, meaning that some times IG would give a bigger "profit", it's possible that in the long run D4F would be better (I didn't test it for months and months) but I wouldn't bet my house on it.
If you can, you might want to do a similar thing.
Best rgds
PS I advise not to use their charts for trading, their pants!!