Tonkatsu Box is a free open-source Flutter app by hacan359 that organizes collections of retro games, movies, TV shows, and anime in one local library. It tracks progress, rates favorites, builds shareable visual boards, and shows a daily release calendar. The library is offline-first in a local SQLite database, and the web build can be self-hosted with Docker.[1]
Quick verdict
Free offline-first tracker for games, movies, shows, and anime. Tonkatsu Box is a free open-source Flutter app that organizes game, movie, TV, and anime collections with progress tracking, ratings, and shareable visual boards. The library is offline-first in local SQLite, with Windows, Linux, macOS, Android, TestFlight iOS, and Docker web builds. It suits collectors wanting one private local tracker; metadata depends on third-party providers and cross-device sync is undocumented.[1][2]
What Tonkatsu Box does
Tonkatsu Box keeps retro games, movies, TV shows, and anime in one local library instead of spreading them across separate tracking services.[1]
Each entry can carry watch or play progress, a personal rating, and a place on a visual board that can be shared with friends.[1]
A daily release calendar surfaces new releases across games, movies, shows, and anime so collectors see what is coming out.[1]
The app is offline-first with the library in a local SQLite database, so an existing collection stays browsable without a connection.[1]
The same Flutter codebase ships to Windows, Linux, macOS, and Android, with iOS through TestFlight beta and a Docker-hosted web build for self-hosting.[1][2]
Who it fits
Collectors juggling a backlog across games, shows, movies, and anime who want one local list of what to play or watch next.[1]
Viewers who prefer a private local library over an account-based service, since there is no login and data stays in on-device SQLite storage.[1]
Self-hosters who want the collection available in a browser, through the documented Docker web deployment with a persisted data volume.[1][2]
Limits to weigh
Catalog metadata comes from third-party providers (IGDB, TMDB, and Anilist) and artwork is cached through an image proxy, so entries depend on those external services and their data quality.[1]
The library lives in local SQLite storage, and cross-device synchronization of that library is undocumented, so multi-device collectors should verify the workflow before relying on it.[1]
iOS availability is through TestFlight beta rather than a finished App Store listing, so Apple users get a testing build, not a stable release.[1]
Platforms and fit with Showly
Desktop and mobile installs come through GitHub releases, Google Play, F-Droid, platform installers, and TestFlight, while the Docker image covers browser-based self-hosting.[1][2]
Viewers who only track shows and movies and want cloud sync through a Trakt.tv account may prefer Showly, the open-source Trakt-synced tracker; Tonkatsu Box covers a wider set of media with local offline-first boards instead of account sync.[1][2]
Questions worth asking
Is Tonkatsu Box free to use?
Does Tonkatsu Box work offline?
Yes, the library itself is offline-first: it is stored in a local SQLite database on the device. Fetching new metadata and artwork still requires a network connection to the third-party metadata providers.[1]
Which platforms does Tonkatsu Box support?
Sources and editorial review
Source research. Reviewed on October 13, 2026. Written by Sanjib Sah. AI assisted; reviewed by a human editor.
We have not run or tested this product.
- hacan359/tonkatsu_box repository
official · Observed October 13, 2026
Repository identity, MIT license, Dart language, stars, contributors, and activity used for catalogue facts and maintenance claims.
- Tonkatsu Box README
official · Observed October 13, 2026
Product function, four media types, progress tracking, ratings, boards, sharing, daily calendar, offline-first SQLite, install routes, Docker self-hosting, TestFlight beta.
- Tonkatsu Box LICENSE
official · Observed October 13, 2026
MIT license text served in the repository, consistent with the reported MIT identifier and the free-pricing claim.
- Tonkatsu Box docs
official · Observed October 13, 2026
Data disclaimer naming IGDB, TMDB, and Anilist as metadata sources with proxied image caching; install and self-host guides.
- Tonkatsu Box install docs
official · Observed October 13, 2026
Docker deployment with the published image and persisted network-data volume; mobile and desktop install routes.
- Showly official site
official · Observed October 13, 2026
Showly as the overlapping open-source tracker for TV shows and movies used for the competitor relationship and fit comparison.
Compared with these products
No explicit proprietary baseline is recorded.