MightySignal is a new company that is still pretty small but is similar to MixRank. Their data seems to be a little more up to date, and they have a few extra features. We use a combination of MixRank and MightySignal for our sales team.
Co-founder & COO - Branch Metrics
1%Stacklist Startups Are Using MightySignal
MightySignal provides insight into the mobile app economy.
Visit the website: http://www.mightysignal.com/