The existing answers provide information that Kukai is a web app that is optimized for both desktop and mobile browsers, and that there is no AppStore app. This means that if you want to use Kukai on an Android device, you will need to access it through the web browser. This is important to be aware of as it means that you will need to have an internet connection for Kukai to work. Additionally, it is important to read the pinned message as it contains important information about the use of Kukai. Therefore, if you are looking to use Kukai on an Android device, you will need to access it through the web browser, and make sure to read the pinned message for important information.