// SCORE BREAKDOWN
Specialized triathlon coaching with on-device AI and strong privacy stance addresses a clear niche, though niche limits audience.
// ABOUT
DTrain is an AI-powered triathlon training app built for Ironman and 70.3 athletes who want a smart, personalized coach on their iPhone — no subscription, no cloud, no data sharing. PERSONALIZED DAILY WORKOUTS Every session is generated by an on-device AI model that knows your training phase (Base, Build, Peak, Taper), race date, fitness level, and yesterday's Apple Health data. Swim, bike, run, strength, and rest days — all planned and adapted for you. AI COACH CHAT Chat with your coach anytime. Ask about today's workout, request a swap, report fatigue, or get advice on pacing and recovery. The coach reads your HRV, resting heart rate, and sleep data to give you context-aware guidance. RECOVERY & READINESS Your daily readiness score is calculated from HRV, resting heart rate, and sleep — pulled automatically from Apple Watch. See 14-day sparkline trends for each metric and understand exactly why your score is what it is. HR ZONES & KARVONEN METHOD Set your max heart rate from 6 months of real workout data. DTrain computes your personal 5-zone Karvonen model and applies it to every workout — so Zone 2 really means Zone 2 for your heart. ADAPTIVE TRAINING PLAN The plan evolves with you. Miss sessions, report an injury, or ask for a lighter week — the AI adjusts upcoming workouts to keep you on track for race day without overtraining. 14-WEEK CALENDAR See your full training calendar at a glance. Tap any day to view the prescribed workout and compare it against what you actually completed from Apple Health. FULLY OFFLINE & PRIVATE All AI runs on your device. No account required. No data ever leaves your iPhone. Your health data is yours. APPLE HEALTH INTEGRATION Reads workouts, HRV, resting heart rate, sleep, VO2 max, and heart rate from Apple Health and Apple Watch. Automatically syncs completed workouts to keep your plan up to date. BUILT FOR IRONMAN ATHLETES Supports full Ironman (140.6), 70.3, Olympic, and Sprint distances. Training phases shift automatically as race day approaches.