I periodically look into alternative charting apps. I see that a lot of people seem to use Ninja. I understand that the platform is free if used purely for charting, but requires a license fee if used to trade. How exactly does that work? Can you run it off IB data and trade using the IB platform and it is free? Sounds like a good deal. Is historical backfill automatic or do you have to dick around with it? Are there security issues with using third party charting apps off broker data?