When it comes to photo-centric social networks, some may shy away from the Facebook-owned Instagram if they prefer a quieter environment for sharing images. But what if you could dial out the noise and actually tame the Instagram experience instead? That’s the premise behind Gramatica for Instagram, a $0.99 app that serves up a handful of features currently overlooked by the photo sharing service. Want to quickly switch between multiple accounts? Prefer to filter out certain tags, photos, or even entire users? Gramatica has your back.