Instagram

It wouldn't be a roundup of the best photo apps out there without Instagram. And with good reason. Instagram is still surely the most popular and addictive photo-editing and photo-sharing app around. Not only is it the best way to keep tabs on snaps from friends and family (including your bud Kanye), those iconic filters – Lo-Fi, Brannan, Hefe, and 1977, to name just a few – can't be beat. The app has also added video recording with stabilization so you can shoot and share steady quick clips Vine-style, even if your hands are shaking during a night on the town. [Free; Android, iOS, and Windows (coming soon)]