🏋️ ShadowLift

ShadowLift is a production-ready iOS fitness tracking app built with 100% native Apple technologies. This sophisticated, performance-optimized workout logging and planning app delivers a complete training experience with AI-powered insights, HealthKit integration, and advanced analytics—all with zero external dependencies.

🚀 Currently in TestFlight Beta - Real users, real workouts, real results.

📸 Screenshots

🌟 Core Features

💪 Workout Tracking

Custom Workout Splits – Create unlimited workout routines (Push/Pull/Legs, Upper/Lower, etc.)
Exercise Tracking – Detailed set/rep/weight logging with automatic progression tracking
10 Muscle Groups – Chest, Back, Biceps, Triceps, Shoulders, Quads, Hamstrings, Calves, Glutes, Abs
Multiple Set Types – Warm-up, Failure, Rest-Pause, Drop Sets, Bodyweight
Auto Day Progression – Automatically advances through your split based on calendar
Workout Timer – Automatic workout duration tracking

📅 Calendar & History

Workout Calendar – Visual history with date-based workout retrieval
Complete History – Access all past workouts with detailed logs
Progress Tracking – See your training patterns and consistency over time

⚡ Performance & Sync

Offline First – Full functionality without internet connection
CloudKit Sync – Cross-device sync with intelligent network monitoring
Performance Optimized – No "gym lag" - tested under real gym conditions (60+ min sessions)
5-Second Timeout – CloudKit operations never block UI

🏥 HealthKit Integration

Bidirectional Weight Sync – Read and write body weight to Apple Health
BMI Tracking – Auto-calculated with visual gauge display
Height Tracking – Syncs with HealthKit
Workout Export – Writes workout sessions to Apple Health
Weight Charts – Historical weight visualization

🔒 Premium Features (€2.99/month or €29.99/year)

🤖 AI Workout Summaries (iOS 26+)

On-Device AI Analysis – Uses Apple's FoundationModels (100% private)
Performance Trends – Strength progress and volume analysis
Muscle Balance Detection – Identifies training imbalances
Personalized Recommendations – AI-driven workout suggestions

🎯 Personal Record (PR) Tracking

Automatic PR Detection – Tracks 1RM, 5RM, 10RM, and total volume PRs
Historical Comparison – See how you stack up against previous workouts
PR Notifications – Get notified when you hit a new personal record

📸 Progress Photos

Photo Timeline – Track visual progress with pose guidance
Before/After Comparisons – Swipe to compare photos
Body Part Categorization – Front, Back, Side, Full Body, Custom
CloudKit Sync – Photos sync across all your devices

📚 Pre-Built Templates

Push/Pull/Legs (PPL) – Classic 6-day split
PHAT – Power Hypertrophy Adaptive Training
Upper/Lower Split – 4-day training program
Arnold Split – Classic bodybuilding routine
Full Body – 3-day full body routine

📈 Advanced Streak Analytics

Current Streak Tracking – Days in a row with workouts
Longest Streak Record – Track your personal best
Rest Day Logic – Configurable rest days per week (streak-safe)
Weekly Pattern Charts – Visualize training consistency
Streak Predictions – See projected milestones

🎨 Custom Appearance

5 Accent Colors – Blue, Green, Purple, Pink, Orange
Matching App Icons – Themed icons for each color
Dark Mode Support – Beautiful in light and dark themes

🎁 Free Features

✅ Unlimited Workouts
✅ Custom Splits
✅ Exercise Tracking
✅ Calendar History
✅ HealthKit Integration
✅ CloudKit Sync
✅ BMI Calculator
✅ Muscle Group Charts
✅ Import/Export Splits (.shadowliftsplit files)

🏗️ Technical Architecture

Tech Stack

Language: Swift 5.9+
Framework: 100% SwiftUI (no UIKit)
Storage: SwiftData for persistent data
Authentication: Apple Sign In
AI: FoundationModels (iOS 26+, on-device)
Health: HealthKit
Sync: CloudKit with intelligent network monitoring
Photos: PhotosUI, PhotoKit, AVFoundation
Architecture: MVVM + ObservableObject
Target: iOS 26.0+

Zero External Dependencies

❌ No CocoaPods
❌ No Swift Package Manager packages
✅ Pure Apple frameworks only

Core Data Models

Exercise Model

@Model class Exercise: ObservableObject, Codable {
    @Attribute(.unique) var id: UUID
    var name: String
    var sets: [Set]?                    // Nested SwiftData model
    var repGoal: String                 // "8-12", "5x5", "AMRAP"
    var muscleGroup: String
    var exerciseOrder: Int
    var done: Bool
    var completedAt: Date?
    var createdAt: Date
    var startTime: String
    var endTime: String
}

Set Model (Nested)

@Model class Set {
    var weight: Double              // kg or lbs
    var reps: Int
    var failure: Bool               // Trained to failure
    var warmUp: Bool                // Warm-up set
    var restPause: Bool             // Rest-pause set
    var dropSet: Bool               // Drop set
    var bodyWeight: Bool            // Bodyweight exercise
    var time: String
    var note: String
}

Other Models

Split: Workout routine with multiple days
Day: Single workout day with exercises
DayStorage: Calendar-indexed completed workouts
UserProfile: User data, streaks, stats
ProgressPhoto: Progress photo tracking
PersonalRecord: PR tracking data
SplitTemplate: Pre-built workout programs

Project Statistics

~20,748 lines of Swift code
95 Swift files
14 SwiftData models
4 managers (User, Appearance, Photo, PR)
23 settings views
22 workout views
Comprehensive test coverage

📱 App Structure

ShadowLift/
├── GymlyApp.swift              # App entry point
├── ToolBar.swift               # Main TabView navigation
├── Config.swift                # Global app state singleton
├── Models/                     # SwiftData models (14 files)
│   ├── Exercise.swift
│   ├── Day.swift
│   ├── Split.swift
│   ├── DayStorage.swift
│   ├── UserProfile.swift
│   ├── ProgressPhoto.swift
│   └── PersonalRecord.swift
├── Logic/                      # Business logic
│   ├── WorkoutViewModel.swift  # Central coordinator (41,290 lines)
│   └── iCloudSyncManager.swift
├── Workout/                    # Workout views (22 files)
│   ├── TodayWorkoutView.swift
│   ├── ExerciseDetailView.swift
│   ├── SplitsView.swift
│   ├── SplitTemplatesView.swift
│   └── ProgressPhotoTimelineView.swift
├── Calendar/                   # Calendar views (3 files)
│   ├── CalendarView.swift
│   ├── CalendarDayView.swift
│   └── CalendarExerciseView.swift
├── Settings/                   # Settings views (23 files)
│   ├── NewSettingsView.swift
│   ├── ProfileView.swift
│   ├── HealthKitManager.swift
│   ├── PremiumSubscriptionView.swift
│   ├── StreakDetailView.swift
│   └── AISummary/              # AI features (5 files)
├── CloudKit/                   # CloudKit sync (2 files)
│   ├── CloudKitManager.swift
│   └── CloudKitSyncStatus.swift
├── Managers/                   # Manager classes (4 files)
│   ├── UserProfileManager.swift
│   ├── AppearanceManager.swift
│   ├── PhotoManager.swift
│   └── PRManager.swift
└── Cells/                      # Reusable UI components (11 files)

🚀 Installation & Setup

Prerequisites

iOS 26.0+
Xcode 15.0+
Swift 5.9+

Setup Steps

git clone https://github.com/rektoooooo/shadowlift.git
cd shadowlift
open ShadowLift.xcodeproj

Required Permissions

The app requires these permissions in Info.plist:

<key>NSHealthShareUsageDescription</key>
<string>ShadowLift needs access to read your health data to sync workout and body metrics</string>
<key>NSHealthUpdateUsageDescription</key>
<string>ShadowLift needs access to write workout data to your health records</string>
<key>NSCameraUsageDescription</key>
<string>ShadowLift needs camera access to take progress photos</string>
<key>NSPhotoLibraryUsageDescription</key>
<string>ShadowLift needs photo library access to save progress photos</string>

🔧 Configuration

Bundle Information

Bundle ID: com.icservis.GymlyFitness
App Name: ShadowLift
CloudKit Container: iCloud.com.gymly.app
File Type UTI: com.shadowlift.split
File Extension: .shadowliftsplit

Data Persistence

SwiftData: Exercise data, workout history, splits, photos
UserDefaults: User preferences via Config singleton
CloudKit: Cross-device sync (optional)
HealthKit: Health data integration (optional)

📊 Key Technical Achievements

Performance Optimization

The app was battle-tested and optimized for real gym conditions:

✅ "Gym Lag" Fix – Eliminated UI blocking during poor cellular connections
✅ Network Quality Monitoring – Only syncs on good connections
✅ 5-Second CloudKit Timeout – Prevents network from blocking UI
✅ Workout Mode Detection – Disables auto-sync during active workouts
✅ Cached Computed Properties – Prevents unnecessary recomputation
✅ Memory Leak Fixes – Proper observer cleanup

Testing Philosophy

Real Gym Conditions – Tests simulate 60+ minute sessions with poor cellular
Performance Targets – <20ms per operation, no operation >100ms
Memory Stability – No leaks during extended use
Network Resilience – Tested with network throttling

Test Coverage

GymlyTests/
├── WorkoutPerformanceTests.swift       # Unit performance tests
├── WorkoutFlowPerformanceTests.swift   # Extended session simulation
└── NetworkPerformanceTests.swift       # CloudKit performance

GymlyUITests/
└── GymWorkflowTests.swift              # Full UI automation

📖 File Format

Split files use JSON-based .shadowliftsplit format:

{
  "id": "uuid-string",
  "name": "Push Pull Legs",
  "days": [
    {
      "id": "uuid-string",
      "name": "Push",
      "dayOfSplit": 1,
      "exercises": [
        {
          "id": "uuid-string",
          "name": "Bench Press",
          "sets": [...],
          "muscleGroup": "Chest",
          "repGoal": "8-12"
        }
      ]
    }
  ],
  "isActive": false,
  "startDate": "2024-01-01T00:00:00Z"
}

📈 Analytics & Progress

Muscle Group Radar Charts – Visualize training balance across 10 muscle groups
Weight Progression Graphs – Track body weight changes over time
BMI Monitoring – Visual gauge with health indicators
Workout Frequency – See training consistency patterns
Volume Tracking – Monitor total training volume

🧪 Testing & Beta Access

TestFlight Access

For TestFlight beta access, contact: support@shadowlift.app

Current Status

✅ Active TestFlight beta
✅ Real users in production
✅ Performance optimized for gym conditions
✅ iOS 26+ ready with AI features

📬 Contact & Support

Get in Touch

📧 Support: support@shadowlift.app
📧 General: hello@shadowlift.app
🔒 Privacy: privacy@shadowlift.app
💬 Discord: rektoooooo
📧 Developer: sebastian.kucera@icloud.com
📸 Instagram: @seb.kuc

Legal

🎯 Recent Major Updates

v1.0 (November 2025)

✅ Complete Rebrand – Gymly → ShadowLift
✅ Advanced Streak Analytics – Predictions, weekly patterns, detailed insights
✅ PR Tracking System – Automatic personal record detection
✅ Legal Documentation – Privacy Policy, Terms, FAQ, Support
✅ Performance Fixes – Eliminated "gym lag" with CloudKit optimization
✅ Premium UI – Modernized weight tracking and streak views
✅ App Icon System – 5 themed icons matching accent colors

🔮 Future Roadmap

Planned Features

⏰ Rest Timer – Built-in rest timer between sets
⌚ Apple Watch App – Companion watch application
📚 Exercise Database – Expanded library with video instructions
🌍 Localization – Multi-language support
♿ Accessibility – Full VoiceOver and accessibility improvements
🏆 Achievements – Gamification and milestone tracking

Technical Improvements

🚀 Widget Support – Home screen widgets for quick access
📊 Advanced Analytics – More detailed progress insights
🔄 Enhanced Sync – Faster, more reliable CloudKit operations
🎨 More Themes – Additional color schemes and icons

🏆 What Makes ShadowLift Unique

Technical Excellence

Zero external dependencies – Pure native Apple stack
Performance-first – Tested and optimized for real gym conditions
Privacy-focused – On-device AI, optional cloud sync
Production-ready – ~20,748 lines of battle-tested code

Architectural Strengths

Clean MVVM separation with SwiftUI
Reactive data flow with Combine
Modern async/await concurrency
Intelligent CloudKit sync with network awareness
SwiftData for modern persistence

Unique Features

On-device AI workout summaries (iOS 26+)
Network-aware CloudKit sync (prevents gym lag!)
Progress photo tracking with pose guidance
Streak system with intelligent rest day logic
Pre-built premium split templates
Muscle group radar chart analytics
HealthKit bidirectional sync

📄 License

This is proprietary software developed by Sebastián Kučera.

Built with ❤️ by Sebastián Kučera

Making fitness tracking simple, powerful, and beautiful.

Name		Name	Last commit message	Last commit date
.github/workflows		.github/workflows
Gymly		Gymly
GymlyTests		GymlyTests
GymlyUITests		GymlyUITests
Helpers		Helpers
ShadowLift.xcodeproj		ShadowLift.xcodeproj
images		images
.gitignore		.gitignore
ARCHITECTURE.md		ARCHITECTURE.md
Configuration.storekit		Configuration.storekit
README.md		README.md
SPLIT_SHARING_SETUP.md		SPLIT_SHARING_SETUP.md
TESTING_GUIDE.md		TESTING_GUIDE.md
USER_GUIDE.md		USER_GUIDE.md
claude.md		claude.md

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