Twitter initially opened their analytics dashboard to the public a few months ago. By going to analytics.twitter.com you can track your engagements for your tweets; impressions, detail expands, replies, profile clicks, retweets, and favourites. It also shows data about your followers; interests, location, gender, and shared followers.
A few days ago it seems Twitter started adding analytics into the iOS version of their official mobile app. This has a simplified dashboard view that is accessible via a new “View Analytics Details” bar that appears when you open the detail view of one of your own tweets. This analytics view updates in real time, so you can see the impact of your tweet while on the move!
It’s currently only available in the iOS app, but will undoubtedly be added to other mobile platforms soon.