Android mobile frontend for Koishi.
Note: The main and only functinality of Koishi mobile is adding new records to your collection. The rest you can do through the Koishi web app or via the Koishi RESTful API.
Download the newest version apk from the "Releases" tab on the sidebar. Install that apk on your Android device.
Make sure to allow the installation of unknown apps (Android may block some apps that are not from the official Google Play store)