I met the Leanplum team over a year ago while I was at PlayHaven, shortly after they graduated from TechStars. I was incredibly impressed with what they accomplished with such a small team. They also showed off their platform with a Mario-inspired demo so it. Bonus points. :)

Makes it dead simple to AB test on mobile. Lots of comprehensive, detailed reports to support the AB tests, alongside granular event tracking. Their road map is interesting too- moving towards push notification targeting and life cycle marketing for mobile.

I've been using Lean Plum and have recommended it to my corporate clients that I consult with. Also, the team over at Lean Plum are very helpful and genuine people. Def. worth a mention on Product Hunt and Upvotes!