Letterboxd is an online social cataloguing service for films. Members log and rate films, write reviews, keep a diary of the films they have watched, and maintain watchlists and curated lists. They can also follow the activity of other members. The service runs on the web and as apps for iOS, Android and Apple TV, and was founded in 2011 in Auckland, New Zealand.
Letterboxd is headquartered in Auckland, New Zealand. In September 2023 Tiny, a Canadian venture capital and holding company, acquired a majority stake, while the co-founders retained a minority stake and continued to lead the company. For a European organisation this means a non-EU headquarters and a Canadian majority owner. Where user data is hosted is not publicly documented, so hosting locations and transfer safeguards should be confirmed directly with the provider.