This is the front end GatsbyJS based website that runs wallet.fullstack.cash. This site is based on the bch-wallet-starter Gatsby Starter, and includes the gatsby-plugin-bch-sweep Gatsby Plugin for sweeping BCH and tokens from a paper wallet.
This wallet app has been compiled into an Android app that can be side-loaded onto a phone. It's not available in the Play store. Sideloading the APK file is the only way to install this wallet as a native app.