In general Seesaw works in China and we have many schools working with us there. We do use some 3rd party services (such as Google) that may require your use of a VPN for full access to all features.
We currently distribute our Android app through the Google Play and Kindle Fire app stores. Unfortunately we cannot distribute our APK file directly except in limited circumstances to Seesaw for Schools customers. If you are a Seesaw for Schools customer and would like our APK, please contact support.