# DAY 1 - AI Fitness — AI Fitness Coach · Local Data > AI Fitness Coach · Local Data (iPhone/iPad app by 蔚 刘.) - Source: https://appshunter.io/ios/app/day-1-ai-fitness/id6759196162 (this page in markdown: same URL + `.md`) - Developer: [蔚 刘](https://appshunter.io/developer/1872991689) - Category: Health & Fitness - Price: Free with in-app purchases - Age rating: 12+ - Requires: iOS 17.0 · 30 MB - Languages: English, Japanese, Korean, Chinese, Chinese - Released: 2026-03-16 - Data updated: 2026-06-15 - User reviews in markdown: https://appshunter.io/ios/app/day-1-ai-fitness/id6759196162/reviews.md ## What is DAY 1? DAY 1 — Your AI-Powered Fitness Coach Combining Apple HealthKit data with AI-powered analysis, DAY 1 creates personalised training plans tailored to you. Your sensitive health data stays on your device. Cloud-synced data is fully encrypted — your privacy, your control. Terms of Use: https://wei666-china.github.io/day1-app/terms.html Privacy Policy: https://wei666-china.github.io/day1-app/privacy.html SMART TRAINING PLANS AI automatically adjusts daily training intensity and content based on your body data and recovery status. RECOVERY ASSESSMENT Green / Yellow / Red light system — using heart rate, HRV, sleep quality and more to scientifically determine your training readiness. AI CHAT COACH Ask your AI coach anytime for personalised training and nutrition advice based on your health data. Multiple AI providers supported. DEEP HEALTHKIT INTEGRATION Reads heart rate, HRV, sleep, body temperature, steps and more. Writes workout records back to the Health app. NUTRITION TRACKING Track daily meals with nutrition advice tailored to your training goals. CYCLE-AWARE TRAINING Female users can optionally enable menstrual cycle management for cycle-adapted training adjustments. Privacy Promise: - Sensitive health data stays on your device - Cloud-synced data encrypted in transit and at rest - No ads, no tracking - AI conversations use de-identified summaries only ## Pricing and in-app purchases Base price: Free. **Subscriptions** | Subscription | Price | Period | | --- | --- | --- | | DAY 1 Pro Monthly | $4.99 | per month | | DAY 1 Pro Quarterly | $12.99 | per 3 months | | DAY 1 Pro Yearly | $39.99 | per year | ## Version history (last 5 releases) ### 3.0.2 — 2026-04-29 - Improved workout experience and data sync stability - Enhanced Apple Watch connectivity - Bug fixes and performance improvements ### 2.1.0 — 2026-03-24 【Core Upgrades】 - New in-app feature guide to help you get started quickly - Smarter AI memory: learns your preferences over time - Expanded exercise library with functional training & stretching - Warm-up vs. working sets now distinguished in training plans 【AI & Experience】 - Major AI chat stability improvements, lag fixed - Redesigned food logging UI with smoother photo recognition - Direct number input for nutrition adjustments - Beta extended to Apr 3 — 50 chats & 15 photo scans per day 【Apple Watch Sync】 - Real-time two-way set completion sync between iPhone & Watch - Manual sleep entry for non-Watch users, fairer readiness scores 【Polish】 - Swipe or tap to dismiss keyboard - Refreshed menstrual cycle card design - Multiple stability & security fixes ### 2.0.9 — 2026-03-17 What's New in v2.0.1 Bug Fixes - Fixed AI Coach displaying raw JSON instead of formatted training plans - Fixed training session state lost after app is terminated in background — your workout now auto-restores when you reopen the app - Fixed Watch-iPhone real-time sync: set completion and heart rate now update on iPhone instantly during Watch workouts Stability & Code Quality - Fixed force unwrap crashes in HealthKit data queries - Added ~25 weak self captures to prevent potential memory leaks - Fixed race conditions in Watch-iPhone connectivity managers - Unified App Group ID constants across all targets - Replaced magic numbers with named constants for HealthKit query windows Women's Health Improvements - Added input validation for cycle and period length settings - Added HealthKit auto-sync on app launch Security Enhancements - Security audit and hardening across the app - Improved thread safety for connectivity managers Accessibility - Added VoiceOver labels to Watch health cards, training plans, and progress stats - Improved accessibility for core training views Watch App - Fixed @StateObject usage for singleton managers - Removed duplicate data fetch calls - Added workout start error feedback ### 2.0.6 — 2026-03-16 What's New in v2.0.1 Bug Fixes - Fixed AI Coach displaying raw JSON instead of formatted training plans - Fixed training session state lost after app is terminated in background — your workout now auto-restores when you reopen the app - Fixed Watch-iPhone real-time sync: set completion and heart rate now update on iPhone instantly during Watch workouts Stability & Code Quality - Fixed force unwrap crashes in HealthKit data queries - Added ~25 weak self captures to prevent potential memory leaks - Fixed race conditions in Watch-iPhone connectivity managers - Unified App Group ID constants across all targets - Replaced magic numbers with named constants for HealthKit query windows Women's Health Improvements - Added input validation for cycle and period length settings - Added HealthKit auto-sync on app launch Security Enhancements - Security audit and hardening across the app - Improved thread safety for connectivity managers Accessibility - Added VoiceOver labels to Watch health cards, training plans, and progress stats - Improved accessibility for core training views Watch App - Fixed @StateObject usage for singleton managers - Removed duplicate data fetch calls - Added workout start error feedback ### 2.0.0 — 2026-03-11 DAY 1 2.0 — Major Update ◆ AI Coach — Fully Evolved All-new AI Coach: deeply integrated with your health data — heart rate, sleep, training history — to build a truly personalized training plan Live AI Companion: real-time monitoring throughout your workout, instant feedback on heart rate zones and progress, just like having a personal trainer AI Food Recognition: snap a photo, get calories, protein, carbs and fat identified in 3 seconds Switch between multiple AI providers (Qwen, DeepSeek, Kimi, Doubao, and more) ◆ Traffic Light Decision System Built-in traffic light algorithm that quantifies your body's readiness as data Morning Check-in: daily assessment of energy, soreness, stress and more Green means go hard, yellow means take it easy, red means rest — no more guessing ◆ Training Experience Upgrades All-new Progress Tracking: sessions, streaks, duration trends — see your transformation in data Dynamic Island Live Activity: real-time training progress on your lock screen Two-way Apple Watch sync: training status stays in perfect sync Rest timer with AI pacing suggestions ◆ Nutrition Management Daily calorie deficit tracking — intake vs. burn at a glance Custom nutrition targets: calories, protein, carbs, fat Missed meal reminders to keep your data accurate iOS 18 Control Center shortcut: one tap to launch AI food recognition ◆ More Improvements AI Weekly Report: weekly training attribution analysis Female cycle tracking integrated with AI recommendations Optional iCloud sync Remote announcement system Three languages: Simplified Chinese / Traditional Chinese / English Security upgrades: API key stored securely in Keychain, SSL certificate pinning --- *Data collected daily from the US App Store and indexed by [AppsHunter](https://appshunter.io/). User reviews are verbatim App Store reviews. Ratings, prices and chart positions refresh continuously; this snapshot is from 2026-06-15.*