Tonkatsu Box is a free, MIT-licensed Flutter application for Windows, macOS, Linux and Android that keeps games, movies, TV shows, anime, visual novels, manga, books, music and podcasts in a single personal collection manager.

What it is

Tonkatsu Box is an open-source desktop and mobile app, written in Dart with Flutter and Material Design 3, that acts as one library for every medium a collector tracks. It is listed in the Productivity & Utilities / Bookmark & Content Management category and reached 539 stars with 28 forks. Fifteen catalogs sit behind one search field — IGDB, TMDB, TVmaze, VNDB, AniList, Kitsu, MangaBaka, MangaDex, OpenLibrary, Fantlab, Google Books, Hardcover, ComicVine, MusicBrainz and Podcast Index — so a game, a season of television and a manga volume are added from the same place.

The concrete problem it solves is fragmentation. Collectors who track anime on AniList, films on Trakt.tv, games on Steam and reading on Hardcover end up with several partial libraries and no single view of progress, ratings or backlog. Tonkatsu Box replaces that scatter with one local database: it imports from Steam, IGDB lists, Trakt.tv, Simkl, Kinorium, RetroAchievements, MyAnimeList, AniList and Hardcover, and accepts JSON, CSV and .xcollx files.

Key capabilities

• Unified search across fifteen catalogs, each with its own filters and an empty-query browse mode; a single result can be added to several collections at once.
• Episode tracker with a season accordion showing posters, episode stills, air dates and synopses, plus one-tap marking of an episode, a whole season or the next unwatched episode for TMDB, TVmaze and Kitsu titles.
• Progress tracking with status, ratings from 1 to 10, start and finish dates, replays and time spent, reading progress by page for books, by chapter for manga, and a listened-track checklist for albums.
• Collections organized by platform, genre or any custom scheme, viewed as grid, list, table or board, with manual drag-and-drop ordering and bulk actions over a selection.
• Visual boards including tier lists and mood grids, alongside a genre, platform or decade cloud generated from the library itself.
• Statistics that show the library in numbers for all time or one year: counters, per-type breakdowns, a month-by-month ribbon, platforms, formats, tags, best versus worst, and a shareable summary card.
• Releases and calendar, where followed shows drop upcoming episodes onto a month, week or day calendar together with user-added dates.
• Global tags with a dedicated manager for grouping and filtering, applied across a whole selection, and likes plus notes on individual episodes, seasons, chapters, volumes or pages.
• Full interface localization with runtime switching under Settings → App Language and no restart: English, Russian, Simplified Chinese, Spanish, Brazilian Portuguese and French are complete.

Who uses it and how

• Cross-medium collectors consolidating existing libraries, importing from Trakt.tv, Simkl, MyAnimeList, AniList, Kinorium, Steam, RetroAchievements and Hardcover, or from JSON, CSV and .xcollx files.
• Anime and manga readers who need granular progress, since chapters and pages are tracked separately from episodes and films.
• Television viewers who follow airing shows and rely on the calendar to see when the next episode lands.
• Multilingual users who switch the interface language at runtime without reinstalling or restarting the app.
• Desktop-first users on Windows, Linux and macOS who also want an Android build, with a self-hosting option for the web version documented in the README.

Getting started

The README points to its Download and Quick Start sections for installable builds and to Building from Source for compiling the Flutter project yourself. Builds and documentation are published through the project homepage at hacan359.github.io/tonkatsu_box.

How it compares

Tonkatsu Box sits alongside the services it can import from — Trakt.tv, Simkl, MyAnimeList, AniList, Kinorium, Steam and RetroAchievements — rather than competing with any single one of them on its own medium. Those services hold a user's data inside an account, while Tonkatsu Box keeps it in a local application folder under an MIT licence and pulls the other libraries in.

When to use it — and when not to

The app is in active development, and updates may include database migrations that change the data format, so a backup must be created before updating (Settings → Backup → Create Backup) or the data folder copied manually from %APPDATA%\Roaming\Tonkatsu Box\Tonkatsu Box on Windows, ~/.local/share/tonkatsu_box on Linux or ~/Library/Application Support/com.hacan359.tonkatsuBox on macOS. Anyone who wants a finished, migration-free product or is unwilling to run a web deployment and manage backups should wait. The README also remains thinner on sync and self-hosting details than on catalog coverage, so server-side operation is the least documented part.