CycleSyncAI is an iOS app designed to provide personalized diet and workout recommendations tailored to a woman’s menstrual cycle phase. By integrating menstrual data from Apple HealthKit and optional user profile inputs (age, weight, height, medical conditions, dietary restrictions, goals, and preferences), the app generates dynamic, phase-aware suggestions to support holistic wellness. Unlike static wellness tools, CycleSyncAI leverages Perplexity’s Sonar Pro API to deliver expert-informed, LLM-generated guidance — including a daily grocery list and motivational feedback — customized to the user’s cycle and lifestyle.

​
Problem & Solution

Why it matters:
Most apps overlook the hormonal changes that affect women’s fitness and nutrition needs across their cycle, leaving users with generic advice.
CycleSyncAI bridges this gap by combining Apple HealthKit data with Sonar Pro’s LLM to generate adaptive, cycle-aware recommendations for better health outcomes.

​
Features

  • Personalized diet & workout suggestions per cycle phase
  • Syncs with Apple HealthKit for real-time cycle tracking
  • User profile inputs for advanced personalization (age, goals, restrictions, etc.)
  • Auto-generated daily grocery list
  • Smooth, modern UI with gradients and subtle animations
  • Motivational AI feedback tailored to user preferences
  • Local data storage and private processing

​
Motivation

“I wanted a tailored regime for myself and couldn’t find it all in one place.”
CycleSyncAI was born from the need for a science-backed, easy-to-use app that adapts wellness guidance to women’s natural hormonal rhythms, something missing in most mainstream fitness and nutrition platforms.

​
Repository Structure

CycleSyncAI.xcodeproj          → Xcode project file  
CycleSyncAI/                   → Source code  
├── EatPlanViewController.swift        → Diet plan generation & display  
├── WorkoutPlanViewController.swift    → Workout plan generation & display  
├── HomepageViewController.swift       → Navigation & main screen  
├── UserProfileViewController.swift    → Input & storage of user data  
├── HealthManager.swift                → Apple HealthKit menstrual data  
├── UserProfile.swift                  → Local profile model  
Main.storyboard               → App UI & layout  
Assets.xcassets              → Images & app icons  
Info.plist                   → Permissions & configurations

​
Setup Instructions

  1. Clone the repo
  2. Open in Xcode
  3. Ensure Apple HealthKit is enabled on your device
  4. Insert your Sonar Pro API key
  5. Run the app on a physical device (recommended)

​
Sonar API Usage

The app sends structured prompts to the Sonar Pro API including:
  • Cycle phase (from HealthKit)
  • User profile info (age, weight, goals, etc.)
  • Meal preferences & restrictions
In return, it receives:
  • Personalized diet plan
  • Custom workout plan
  • Daily grocery list
  • Motivational feedback
These are parsed and rendered as styled HTML inside the app using WebViews.

​
Demo Video

Watch the full app walkthrough here: https://www.youtube.com/watch?v=R558uRLNvUM&t=2s.
Note: The LLM takes ~30–60 seconds per request. This wait time was trimmed in the video for brevity.

​
Impact

CycleSyncAI empowers women to make informed, body-aware decisions in daily life. The app supports better:
  • Energy management
  • Fitness results
  • Mental well-being
  • Motivation and confidence
It also reduces decision fatigue with automatically prepared grocery lists and uplifting guidance.