The Android app has been taken offline because of some bugs I found recently. A new version will be available in a couple of days. The most serious bug is that progress is occasionally not saved – this appears to happen when a device is shut down without first exiting the app (but I will need to run some tests). If you have learned a large number of kanji and do not want to lose your work, make sure you close the app first. The other bugs are more in the ‘annoying’ category. Details to follow.