Privacy Policy

Introduction

Weight Forecast ("we", "our", or "us") is committed to protecting your privacy. This Privacy Policy explains how we collect, use, disclose, and safeguard your information when you use our weight tracking and AI prediction application.

By using Weight Forecast, you agree to the collection and use of information in accordance with this policy.

Information We Collect

Personal Information

When you create an account using Google OAuth, we collect:

• Your name
• Email address
• Profile picture (optional)
• Google account ID

Health & Fitness Data

You voluntarily provide:

• Weight measurements (morning, afternoon, evening)
• Height and desired target weight
• BMI calculations
• Activity type, distance, duration, and calories burned
• Calories consumed (manual entry or AI food scanning)
• Sleep quality and duration
• Heart rate and RPE (Rate of Perceived Exertion)
• Personal notes and progress photos

Photos & AI Analysis

When you use our AI food scanner, photos are temporarily processed to estimate calories. Photos are stored securely in your account and are never shared publicly.

Usage Data

We automatically collect:

• Device information (browser type, operating system)
• IP address (anonymized)
• Usage patterns and feature interactions
• Performance metrics and error logs

How We Use Your Information

We use your information to:

• Provide AI predictions: Calculate your estimated goal date using linear regression on your weight history
• Track your progress: Store and display your weight entries, BMI, and health metrics
• Analyze food: Process food photos with AI to estimate calories
• Sync across devices: Ensure your data is accessible on all your devices
• Improve the app: Analyze usage patterns to enhance features and performance
• Send notifications: Alert you about important updates (with your consent)
• Provide support: Respond to your questions and technical issues

Data Storage & Security

Where Your Data is Stored

Your data is stored securely using:

• Firebase Firestore: Encrypted cloud database with strict security rules
• Local storage: Cached data for offline functionality (syncs when online)
• Cloudinary: Secure image storage for photos with restricted access

Security Measures

We implement industry-standard security practices:

• End-to-end encryption for data transmission (HTTPS/TLS)
• Firebase Authentication with secure token-based access
• Role-based access control (only you can access your data)
• Regular security audits and vulnerability scanning
• Data isolation: Your data is never mixed with other users

Data Sharing & Disclosure

We Do NOT Sell Your Data

Your health data is never sold, rented, or traded to third parties. Period.

Third-Party Services

We use trusted third-party services that may process your data:

• Google OAuth: For secure authentication (name, email, profile picture)
• OpenAI API: For AI-powered food calorie estimation (food photos only, not stored)
• Firebase (Google Cloud): For database and authentication
• Cloudinary: For secure photo storage
• Vercel: For hosting and content delivery
• Google Analytics: For anonymized usage statistics (you can opt out)

These services are bound by their own privacy policies and are GDPR/CCPA compliant.

Legal Requirements

We may disclose your information if required by law, court order, or to protect the rights, property, or safety of Weight Forecast, our users, or the public.

Your Rights & Choices

Access & Control

You have the right to:

• Access your data: View all stored information in your account
• Export your data: Download a copy of your data in JSON format
• Edit your data: Update or correct any information
• Delete your data: Permanently delete your account and all associated data
• Opt-out of analytics: Disable Google Analytics tracking

Data Retention

We retain your data for as long as your account is active. If you delete your account, all data is permanently removed within 30 days, except as required by law.

GDPR & CCPA Compliance

If you are in the EU or California, you have additional rights under GDPR or CCPA. Contact us to exercise these rights.

Cookies & Tracking

Essential Cookies

We use cookies for:

• Authentication (keeping you logged in)
• Session management
• Offline functionality (PWA)

Analytics Cookies

We use Google Analytics to understand how users interact with our app. You can opt out by disabling cookies in your browser or using browser extensions like uBlock Origin.

Children's Privacy

Weight Forecast is not intended for users under 13 years old. We do not knowingly collect personal information from children. If you believe we have collected data from a child, please contact us immediately.

Changes to This Policy

We may update this Privacy Policy from time to time. We will notify you of significant changes by:

• Posting the updated policy on this page
• Updating the "Last updated" date
• Sending an email notification (for material changes)

Your continued use of the app after changes constitutes acceptance of the updated policy.