Here are top categories by downloads, Q3 2014 - iOS App Store
1 Games
2 Entertainment
3 Photo & Video
4 Social Networking
5 Lifestyle
Top categories by Revenue - iOS
1 Games
2 Social networking
3 Music
4 Education
5 Entertainment
Top categories by downloads - Google Play
1 Games
2 Communication
3 Tools
4 Entertainment
5 Photography
Top categories by revenue - Google Play
1 Games
2 Communication
3 Social
4 Tools
5 Travel & Local