Intervals.icu Companion vs TrainingSelf

Intervals Companion is a powerful third-party companion app for Intervals.icu, bringing your training data to iOS, watchOS, and macOS with beautiful widgets, deep Apple Health integration, and advanced analytics. Two-Way Apple Health Sync Automatically sync workouts recorded on Apple Watch or iPhone to Intervals.icu, and push Intervals.icu activities back to Apple Health to close your Activity Rings. Sync daily health metrics like HRV, sleep scores, and readiness scores between Apple Health and Intervals.icu, keeping all your data in one place. Apple Watch Workout Sync Convert planned workouts from your Intervals.icu calendar and send them directly to Apple Watch so your structured sessions are ready to go when you are. FIT File Import Manually import FIT files to Intervals.icu and/or Apple Health. Bring in workouts from any device or platform with a few taps. Metrics & Custom Charts Build personalized charts and widgets across all fitness and health metric fields. Visualize the data that matters most to you, your way. Library Browse your Intervals.icu workout library and add workouts directly to your training calendar from your phone. Training Analytics - Interactive Fitness, Fatigue & Form graph with drag-to-inspect for past activities and planned workouts - Predict future form based on your scheduled training load - Vitals tracking: HRV, readiness & sleep scores, resting and sleeping heart rates - Distance splits and pace zone charts on activity detail screens Chat & Community - Send and receive private messages with coaches and athletes directly from your phone - View and post comments on activities to stay connected with your training community - Push notification alerts for new messages and activity comments Widgets & Watch - Home screen widgets for iOS, iPadOS, and macOS - Apple Watch app and watch face complications - Sports Summary widget: weekly goal rings for distance and time with customizable colors - Silent push notifications trigger automatic updates when new activities or wellness data arrive on Intervals.icu Intervals Companion is an independent hobby project, not affiliated with or endorsed by Intervals.icu. Fitness metrics and scores are for informational purposes only — not a substitute for professional medical or coaching advice. Terms of Use (EULA): https://www.apple.com/legal/internet-services/itunes/dev/stdeula/

TrainingSelf is a science-based training analytics app with an AI coach that knows your body. Built for cyclists and endurance athletes who train with power, heart rate, and HRV data. PERFORMANCE MANAGEMENT • Normalized Power (NP), Intensity Factor (IF), Training Stress Score (TSS) • Performance Management Chart: CTL (fitness), ATL (fatigue), TSB (form) • Power Profile radar — know your strengths as a cyclist (sprint, attack, climb) • Power and heart rate zones (Coggan 7 / Karvonen 5) AI TRAINING COACH • Personalized recommendations based on your real biometric data • "Should I train hard today?" — answered with science, not guesswork • AI-generated periodized training plans with compliance tracking • Structured workouts with zones, intervals, and nutrition guidance • Dynamic plan adjustment based on your progress and recovery RECOVERY & READINESS • Readiness Score (0-100): HRV + Sleep + Resting HR + Training Balance • HRV trends with 7-day moving average and baseline range (Plews et al.) • Garmin Connect integration: Body Battery, stress, sleep phases, respiration • Science-backed recovery monitoring (Manresa-Rocamora et al., 2021) DATA INTEGRATIONS • Apple HealthKit — HR, HRV, sleep, workouts, calories • Strava — Activities with power streams, GPS maps • Garmin Connect — Nocturnal HRV, Body Battery, stress, detailed sleep • File import — GPX, TCX, FIT from any device iOS WIDGETS • PMC widget with CTL/ATL/TSB chart • HRV widget with 7-day average and baseline status • Readiness Score widget BUILT ON SCIENCE Every algorithm is backed by peer-reviewed research: Coggan & Allen (TSS/NP), Banister (CTL/ATL/TSB), Plews et al. (rMSSD recovery), and meta-analyses on HRV-guided training and post-exercise nutrition. Free trial: 3 months with 10 AI consultations/day. Subscription plans available after trial.