I've been using it on my iPhone 6 and haven't had any problems at all.
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I look forward to the work you put in, even if I'm only on the little 6. lol.
Tried ToucIt HD and 7. Only one or two icons theme on my 6 Plus and you can see black background. Don't think its compatible with this device...
I would LOVE to find a theme that looked good on my 6 Plus. Patiently waiting...