IG has a browser based chart but it does not have "Range Bars" or "Renko bars" facilities.
Because I have an IMAC I cannot use other chart packages without workarounds/software which I do NOT want.
I suggest ( for IMAC desk top users) that IG consider a package that can be browser based and therefore used on Desk top Macs. ( With "RANGE BAR" and "RENKO BAR" price indicators.)
A package similar to the below would be nice:
Range Bars in action: https://www.forexfactory.com/showthread.php?t=583609&page=183