any recommendation of image blending app?

[Masquer]

Hey, I'm wondering if there's anyone interested in image blending apps?
I have download majority of blending apps on App store, including FACEinHOLE, Juxtaposer, Image Blender and some others. Only to find them either doing the image composing work or lack of convenience & fun. So is there any particular features you want image blender to have?
Automatically blending with no need to adjust brightness, contrast, saturation and hue?
Perfect blending effects?
If there's one you think fits these two features or any apps you thing do the perfect blending, please do let me know. I really wish to have one perfect blending on my iPhone.