I am survey chart & plot tools for iOS App, and find Chart FX for iOS looks good.
Yes, it has a good looking graphical effect, such as gradients.
So, I download the 30-days trial software and test it. But I find the sample chart don't work as I expected on iPhone 6.
It is ok on iPhone 5, but not ok on iPhone 6. Just like the picture show below, the same code has different graphical effect results on iPhone 5 and iPhone 6.
So, now I am hesitate to buy or not to buy Chart FX for iOS.