In addition to blog engagement metrics, our Tumblr blog reporting also offer optional Google Analytics integration and Tumblr blog follower growth metrics.
You can authenticate with Tumblr to track your blog's follower growth in our reports. That will measure your cumulative follower counts over time - the purple line in this graph. It also includes minimum and maximum values for the time period. Please note that we will never post to your Tumblr blog on your behalf.
In addition, we also offer Google Analytics integration. If you'd like to connect up with your GA account, we can track visits to your Tumblr blog alongside our engagement metrics. That's the orange line in the graph.
If you have questions about getting set up, try this.