Board Game Stats is a very comprehensive app, with lots of features. If you want even more, there are a couple of in-app purchases available to expand the feature-set even further.
Power expansion
The Power expansions adds all sorts of new options throughout the app: a lot of new stats, many different filter options and the ability to Tag.
Combines the previous Deep Stats and Tagging expansions.
Challenges expansion
The Challenges expansions let you create an unlimited number of challenges to reach a certain number of plays, your next H-index, or set a challenge to play a certain number of games a certain number of times.
Cloud sync
Cloud sync automatically syncs your Plays, Players, Games and Locations between your devices seamlessly. It also provides you with a backup of your data in the cloud.