Trakt.tv

Its episode tracker is its best feature.

Great site, but, really, 100 items limit for watchlist? Just no. Not recommend anymore.

Trakt is literally one of my favorite websites on the entire Internet, of all time. It is so neat to have so much data available not only about my own viewing habits but aggregated from all the other users via scrobbling, which gives a truly accurate picture of what people are really watching and enjoying. The comments section often reads more insightful and earnest than the New York Times, and the developer always goes the extra mile to engage with the userbase on anything they think important.

Good functionality. But genaral use is slow and kinda unpredicable.

Great website to keep track what tv series/movies you watched.

I use Trakt.tv all the time. It's an awesome way to track what I watch.

Works perfectly. Tracking shows and movies is extremely easy. There is a paid VIP subscription required for some features but as the API is free there is plenty of tools available that provide premium functionality for free.