🏋️ 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

• Privacy Policy
• Terms of Service
• FAQ
• About

🎯 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

© 2024 ShadowLift. All rights reserved.

This is proprietary software developed by Sebastián Kučera.

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Built with ❤️ by Sebastián Kučera

Making fitness tracking simple, powerful, and beautiful.