NOTICE: If you registered before 2016-03-25 (during the time of ABCs of Chinese v1.0) and this is your first time to sign in since 2016-03-25, you first need to click "Register" below and register again with the same username and email address. (You need to do this because on 2016-03-25 we upgraded to faster servers, so you need to migrate over your existing data to our v2.0 app servers.)
You only need to do this once, and in the future just ignore this message.
IF YOU CREATED YOUR ACCOUNT AFTER 2016-03-25, also ignore this message. Simply sign in below.
NEW USERS: Welcome! Please click "Register" below to get started.