I can already tell you that Snapseed is my absolute favorite. It doesn't rely so heavily on filters alone, and in the different sorts of filters you DO have, you can manipulate the outcomes with much more control.
That's the original. And can I just pause here to say how much I adore white tulips? Crisp and clean, and then the stems do their funky thing and get all twisty and artsy. Anyways, I futzed around in Snapseed and came out with this:
There are different sort of textures you can apply through Drama, Grunge, and Vintage, for example. You can mess around with the focus points, the amount of lightness and brightness in the center of the photo or on the peripheries. SO cool. The saturation, brightness, focus, texture, all can be played with. The end result of my tulip photo looks creepy and old and like it was found stashed in an old shed or attic.
That's the original and isn't she ADORABLE?
This is Snapseed again. I was really getting into it with this photo, and you can tell I messed with the light and the focus on the edges and in the center. I am absolutely a complete and utter photography noob so all this is probably old news and boring as hell for anyone with an ounce of experience. But I really enjoyed learning how to manipulate the images and seeing how the mood of a photo can be completely changed by a just a few tweaks.
This is Afterglow. There's not a whole lot that I did to it but I did like the warmth of the filter I used and I think I made the shadows a little richer. The filters are loads more subtle than in Instagram. I will admit that I haven't fully explored Afterglow but you can mess around with highlights, brightness, contrast, shadows and exposure.You can even add lens flares, twist the photo around. And both apps are really easy and really fun to play around with. That is not an advertisement either, they don't know I even exist.