Letterboxd is a social cataloging site for films. You log what you watch, rate it out of five stars, write reviews if you want, and follow other users to see what they are watching. Lists are a big part of the culture — users create themed lists like "films to watch when it rains" or "best cinematography of the 2010s," and browsing them is a good way to find something new. The site also tracks your viewing stats over time.

Unlike Rotten Tomatoes or IMDb, which focus on aggregate scores, Letterboxd feels more personal. The reviews range from serious criticism to jokes, and the community has its own inside references. It's free to use, with a paid tier that adds features like streaming availability and year-in-review stats. If you watch a lot of movies and enjoy talking about them, it's a natural fit.