Gemma-San — A Teacher in Every Pocket. (opens in new tab)

This is a submission for the Gemma 4 Challenge: Build with Gemma 4 What I Built Gemma-San is an offline AI tutor for children aged 5–12, built for Nigerian kids first but speaking whatever language the child speaks. It runs Google's Gemma 4 E2B model fully on-device on a sub-$200 Android phone — no cloud, no data plan after the one-time setup. A child taps the mic, talks (English, Pidgin, Yoruba, Hausa, Igbo — even Japanese), and Gemma-San responds with voice, illustrations, and patience. It ...