Letterboxd for iOS delivers the complete social film-tracking experience to iPhone and iPad users, positioning itself as the premier mobile companion for cinephiles. The application translates the web platform's core functionality into a native mobile interface, maintaining the service's established reputation within film enthusiast communities while adding mobile-specific conveniences. The app supports comprehensive film logging with rating systems, review composition, and diary functionality that records viewing dates. Users can browse curated collections including popular films, highly-rated titles, and the platform's official Top 250 Narrative Features list. Social features enable following other users, viewing activity feeds, and discovering films through community recommendations. The integration with existing accounts ensures seamless synchronization between mobile and web experiences, while 1Password support enhances login security. The interface employs a clean, minimalist design that prioritizes film posters and user content, though some navigation elements require familiarization according to user feedback. Real-world usage patterns show heavy engagement during film viewing sessions for immediate logging, alongside regular browsing for discovery between viewings. The app facilitates quick interactions like rating recently watched films while providing deeper engagement through review composition and social interactions. User feedback consistently praises the interface design and functionality, with jzsimon (August 29, 2025) describing the 'beautiful interface to Letterboxd in all its myriad functions.' Mixoroko (September 3, 2025) notes that while 'the app isn't perfectly intuitive,' it becomes 'charming' with familiarity and represents 'social media done right.' Multiple reviewers including CardiffBeachDad (August 31, 2025) highlight the discovery aspect, noting users 'realize there's movies you love that you never knew about.' The application excels as a specialized social network for film enthusiasts, offering robust tracking features and community engagement tools. Limitations include some navigation learning curves and feature parity still developing compared to the web platform. Ideal for dedicated film watchers maintaining viewing records and seeking community recommendations, though casual viewers may find the social features unnecessary. The app successfully delivers core Letterboxd functionality while establishing its value as a mobile companion rather than mere extension.