I had no idea what this was until I clicked around a bit so I was going to make a couple of suggestions for your home page (like explaining what it does and linking straight to the app) but I see that you have a 'pro' home page that has more content, so this looks very much like a work in progress.

You might need to do more to drive people to the free version to try before they buy. Have you considered different payment plans, like one offs?

Also when an image is uploaded it'd be good if the image aspect ratio was preserved so that it isn't distorted.