It also has an iOS app, which makes Letterboxd the most effective iPhone apps to track movies seen. But importantly, it also enables you to track what you have seen. More importantly, these works assume a list of pre-outlined classes which can be visually distinguishable. But we argue that a metric that may reward a system for having goal tags near the top of the list is more applicable for this job. Here you may check every episode as you watch it, with a progress bar at the top to point your overall season progress.