I'm trying to calculate retention rate / churn rate for my RSS feed.<p>I'm looking for a service similar to http://tweetake.com/  and http://www.tweeteffect.com/ for twitter. Unfortunately there is no way to identify RSS readers (or maybe there is?), so I don't believe a custom colution is viable (I'm talking as a non-developer, forgive me if I'm wrong).<p>Counting the subscribers one week, and seeing the difference the next week, is not what I'm looking for. In that case, only the net gain or loss is calculated.<p>Any other creative ways are welcome.<p>Thanks, 
talbina
Ask HN:Any RSS analytics tool for # of new subscribers and unsubscribers?