Good day, I saw there wasn't any post about it so I thought I would do my bit. It's called the series guide, (if you know if it's available to on IPhones, please comment with the direct link to the app.) it allows you to keep track of all your series and which ones yous till need to watch on a season and episode basis, the latest version when I still was adding shows I had watched (earlier this year) had started adding anime ( which for a fan like me, this is great news).