Twitter appears to now let users get analytics of their tweets and their followers. Log-on to Twitter’s analytics page and you can see various statistics, including the number of tweets and retweets each day and month, the number of followers and “unfollows” you’ve had during the last month, and the gender of your followers.
You can read more about it at this Slate article, Now Twitter Lets You See Which of Your Tweets People Are Actually Clicking.
I’m adding it to The Best Third-Party Twitter Apps That Don’t Require Your Password even though it obviously isn’t a “third-party” app. Be aware I haven’t updated that list for awhile, so some of the apps on that list may not be working any longer.
You may also be interested in My Best Posts Related To Twitter.