DAY 1 - AI Fitness
AI Fitness Coach · Local Data
Free · In‑App Purchases · Designed for iPad. Not verified for macOS.
Your AI-powered fitness system — smart training plans, real-time coaching, photo-based diet analysis, cycle tracking, and Apple Watch integration.
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
more - Improved workout experience and data sync stability
- Enhanced Apple Watch connectivity
- Bug fixes and performance improvements
3.0.2 Apr 29
- Improved workout experience and data sync stability
- Enhanced Apple Watch connectivity
- Bug fixes and performance improvements
3.0.0 Apr 28
What's New in v2.8.8 — Major Update!
NEW FEATURES:
Immersive AI Chat — full-screen coaching with text, voice & image input
Share Cards — create beautiful, customizable workout share cards
Bump Share — tap phones together to share workout data instantly
Plan Adjustment — fine-tune your AI training plans
Mascot System — meet your animated training companion
Watch Exercise Browser — browse the full exercise library on Apple Watch
Tutorial & Onboarding — guided walkthrough for new users
Feedback Center — submit feedback and feature requests in-app
IMPROVEMENTS:
Enhanced AI with memory system and image analysis
Redesigned training cycle interface
3D logo & visual refresh
700+ new translations across 5 languages
Better Watch connectivity & treadmill focus mode
Numerous bug fixes and performance improvements
2.8.8 Apr 15
v2.6.6 What's New:
[Workout Reports]
- Post-workout report with heart rate curve, HR zones, calories, and RPE
- Workout history browser with AI-powered comparison between sessions
- Detailed workout view with full HR chart and training diary
[Exercise Library]
- Browse exercises by muscle group or functional category
- Create custom exercises
- Add or remove exercises mid-workout
[Strength / Functional Dual Mode]
- New functional training mode (Animal Flow, climbing, combat, etc.)
- AI coach adapts guidance based on active training mode
- Decision engine detects cross-mode recovery overlap and mixed-training warnings
[Treadmill Focus Mode]
- Full-screen timer with progress ring (portrait & landscape)
- Synced focus view on Apple Watch
- Auto screen-on, real-time heart rate & calorie display
[Readiness Details]
- Six-axis radar chart with historical trends (week/month/year)
- Training suggestions, warnings, and PR window alerts
[Apple Watch Enhancements]
- Watch AI review: Digital Crown paging + card gesture quick-ask
- Watch exercise list: music control + tap to jump to exercise
- Two-way exercise sync during active workout
[Other Improvements]
- kg / lb weight unit toggle
- ~370 new localization strings per language
- Auto heart rate data collection from HealthKit post-workout
2.6.6 Apr 5
Day 1 v2.1.6 — What's New
Training Experience Overhauled
Brand-new Progress Tracking page with visual charts to see your fitness trends at a glance
Exercise library expanded to 123 movements covering more muscle groups and training styles
Warm-up sets and working sets are now distinguished for a more structured workout
End-of-session flow refined to prevent duplicate submissions and ensure data accuracy
Training comparison and review now supports collapsible display for a cleaner interface
Smarter AI Coach
AI-generated workout plans now require confirmation before applying — no more accidental taps
Improved AI chat stability, fixing occasional freezing issues
Enhanced AI memory system for more personalized recommendations
Better Health Insights
Sleep goal adjusted to 8 hours to better support athletic recovery
Manual sleep logging now available for users without Apple Watch
Calorie display prioritizes real-time Watch data for greater accuracy
Traffic-light decision system fairness improvements
Nutrition & Body Tracking
Completely redesigned food logging interface with numeric keypad input for nutrients
New menstrual cycle tracking card with thoughtful, supportive copy
Quality of Life
New feature guide for first-time users — get started with ease
About page now auto-reads the latest version number from the app bundle
Added a "cooling-off" confirmation before clearing all personal data to prevent accidental deletion
Full localization in 5 languages: English, Simplified Chinese, Traditional Chinese (HK), Japanese, Korean
2.1.6 Mar 30
【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
2.1.0 Mar 24
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
2.0.9 Mar 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 Mar 16
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
2.0.0 Mar 11
- Improved workout experience and data sync stability
- Enhanced Apple Watch connectivity
- Bug fixes and performance improvements
more Version 3.0.2 Apr 29
Data Linked to You The following data may be collected and linked to your identity:
Health & Fitness Identifiers Usage Data