Building an On-Device AI Scam Detector for Android — Gemma 4 + LiteRT

Originally published on rohitraj.tech UPI fraud hit ₹805 cr in India last year. Cloud APIs leak data. So I built ScamRakshak — fully on-device scam detection. 3-tier inference engine: Gemma 4 LLM — context-aware classification LiteRT — fast pattern model Regex fallback — when battery low Full architecture write-up: https://rohitraj.tech/en/notes/build-on-device-ai-scam-detector-android-gemma Read the full version with code samples and diagrams: https://rohitraj.tech/en/notes/build-on-device-ai-s