ZeroOne is a customizable Chinese keyboard with on-device typing and learning. Choose Pinyin, Shuangpin (two keys per syllable), or a nine-key layout. Learn with key hints, create your own Shuangpin scheme, and personalize glass themes, photos, and sounds. Use calculations, conversions, phrases, and world time without leaving the keyboard. No ads or third-party tracking. Basic typing needs no Full Access. Free to download, with in-app purchases.