ZeroCoach: The World's First 100% On-Device AI Athletic Coach

Description and use

ZeroCoach is a fully offline mobile coach that runs a local Gemma 2 LLM for real‑time guidance, nutrition analysis, and adaptive workouts, eliminating subscription fees and cloud latency.

Problem

Millions of fitness enthusiasts pay $100–$200/month for commercial coaching apps that require perpetual subscriptions, leak biometric data to cloud servers, and suffer from cloud latency when offline.

Outcome

ZeroCoach provides a fully offline, privacy‑preserving athletic coaching experience with real‑time LLM inference, multimodal nutrition analysis, and adaptive workout programming, eliminating subscription costs and cloud dependencies.

Workflow

• 1. Install ZeroCoach APK or run via Expo on Android/iOS.
• 2. Grant permissions for HealthKit/Health Connect and camera.
• 3. Capture meal photos for instant nutrition decomposition.
• 4. Sync wearable data locally for real‑time coaching prompts.
• 5. Receive dual‑persona coaching via on‑device Gemma 2 inference (~38 tokens/s).
• 6. View performance analytics and 7‑day composite score computed locally.

Evidence

ZeroCoach runs quantized Google Gemma 2 2B entirely on local device hardware.

Source

Real‑time coaching streaming at ~38 tokens/second locally on phone silicon.

Source

Multimodal Nutrition & Food Decomposition: Instant photo plate decomposition with calorie and macro calculations.

Source

Unified 7‑Day Athletic Telemetry: Direct local sync with Android Health Connect and Apple HealthKit, computing a holistic 0–100 daily composite performance score.

Source