https://www.amazon.com/Precision-Sensitivity-Suitable-Android-Compatible/dp/B0CLXJ2TY6?tag=ftr-tomsguide-us-20&ascsubtag=tomsguide-us-8811805543100395201-20&geniuslink=true
Amazon.com: Bopomofo Stylus (5 Pcs), 2-in-1 Stylus Pen for Touch Screen, High Precision and...
Amazon.com: Bopomofo Stylus (5 Pcs), 2-in-1 Stylus Pen for Touch Screen, High Precision and Sensitivity, Suitable for iPhone/ipad/Android Tablets, Compatible...
2 in 1touch screenhigh precisionamazonbopomofo
https://f-droid.org/en/packages/org.ghostsinthelab.apps.guilelessbopomofo/
Guileless Bopomofo Keyboard | F-Droid - Free and Open Source Android App Repository
A simple Bopomofo software keyboard (input method editor) for typing Hanyu
free and openandroid appbopomofokeyboardsource