Kuroba Experimental (KurobaEx) is a free, open-source Android app for browsing imageboards like 4chan and 8chan. It's a fork of the original Kuroba app, rebuilt with a modern codebase and loaded with features like better bookmarks, a new media viewer, and a thread downloader.
Developer: K1rakishou · License: GPL-3.0 (open source) · Price: Free
Before you start: if you want to use the built-in Mpv video player, you will need to download it separately from within the app, since it is not bundled with the main install.
Official file from the developer's release · Sep 28, 2026 · SHA-256 c967bcd372a90344…
Screenshots
Key features
- New bookmarks that use less memory, skip wakelocks, and show separate swipeable notifications per thread
- Thread downloader that can export threads as HTML pages with all downloaded media
- New media viewer rebuilt from scratch, in its own activity, supporting shared media links
- Composite catalogs that combine multiple boards from different sites into one view
- Per-site proxies, 4chan global search, and support for third-party archives
Why isn’t Kuroba Experimental on Google Play?
It's published by its developer on GitHub rather than on Google Play, and it's not listed on F-Droid either.
Is Kuroba Experimental safe?
This is an open-source project (GPL-3.0) and the APK is built and released by the developer on GitHub. There are two release channels, a stable one and a beta one, so pick the stable release if you want fewer rough edges. Kuroba Experimental comes straight from its developer rather than through Google Play, so it hasn’t gone through Google’s app review. As with any app, check the permissions it asks for and install it if you’re comfortable with them.
How to install
- Tap the download button above: the APK file downloads straight to your phone.
- When Android asks, allow your browser to install unknown apps.
- Open the file and tap Install.
FAQ
Is Kuroba Experimental free?
Yes. It is free and open source under the GPL-3.0 license.
Which imageboards does it support?
It supports 4chan, Dvach, 8Kun, Lainchan, Sushichan, Wired-7, 370chan.info, Endchan, Kohlchan, Krautchan, 8chan.moe, Lefypol, and Diochan, plus several 4chan archives like ArchivedMoe, Fireden, 4Plebs, Warosu, B4k, DesuArchive, and ArchiveOfSins.
How is this different from the original Kuroba app?
It is a fork rebuilt with a newer tech stack (Kotlin, RxJava/Coroutines, Room) and adds features the original did not have, such as the new bookmarks system, thread tabs, bottom navigation, composite catalogs, and a rewritten media viewer.
More free apps you won’t find on Google Play: Open Source Apps · Best Android apps not on the Google Play Store.
Frequently Asked Questions
Is Kuroba Experimental free?
Yes. It is free and open source under the GPL-3.0 license.
Which imageboards does it support?
It supports 4chan, Dvach, 8Kun, Lainchan, Sushichan, Wired-7, 370chan.info, Endchan, Kohlchan, Krautchan, 8chan.moe, Lefypol, and Diochan, plus several 4chan archives like ArchivedMoe, Fireden, 4Plebs, Warosu, B4k, DesuArchive, and ArchiveOfSins.
How is this different from the original Kuroba app?
It is a fork rebuilt with a newer tech stack (Kotlin, RxJava/Coroutines, Room) and adds features the original did not have, such as the new bookmarks system, thread tabs, bottom navigation, composite catalogs, and a rewritten media viewer.
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