P3 PhotoEditor is an app that can let you create your own effect on your own personal style. You don't want an effect for an app, so, I have put in all basic effect in one app.
Brightness & Contrast - This is not normal brightness & contrast effect you have seen on other apps, I have wrote this with unique algorithm which prevent the image being over-exposed when brightness is high and prevent the image turn too grayish when contrast is low.
Color Balance - So far, I have seen very less apps in the App Store allow you to directly adjust RGB of the image. Many of them only provide a few fixed effect which cannot change. But with only this adjustment, you can create any effect you want.
Hue & Saturation - This adjustment allows you to vary the color of the image and the saturation of the color of the image.
Selective Grayscale - A very easy way to contrast an object with particular color in the image. With one tap, you can turn the image into grayscale except the part with the color you have selected. You can vary the range of the selected color by adjusting the hue, saturation and luminous of the color.
Rotate - You can rotate the image to 90, 180, 270 degree to correct the image orientation.
So stop using the same fixed effect for your image and start create your own effect with your own style.