Cost: The free version lets you unify up to 5 profiles; the Pro version, at $9.99/month, lets you consolidate an unlimited number of social profiles and integrate with Google Analytics and Facebook Insights, among other features.
Available on iOS too? Yes
HootSuite unifies your various social media profiles into one console. It lets you form groups of users you want to follow, schedule messages to post at a later time and even track analytics. The mobile app lets you do all of this from your handset.