I'll probably get a bitter answer from the author, as anyone who ventures into negative comments...
Still, I take away 3 stars for misleading title - the "ninja" could obviously not be patented but is definitely misleading in a WP community (false expectations forNinja Forms integration).. I take away 2 more stars for preview not working unless it is live.
I keep 1 star for getting an answer very quickly stating that "Official we not support Ninja Forms and this is not our product"
thank you for your rate.
All compatibility you have on product page:
and there is nothing about integration of NInjaForm.
Very sorry but Ninja Forms it is not our product a we are not support it.
If you need this integration - please let us know and we will help you.