Privacy Policy

1. Introduction

Chat to Lose Weight is an iOS application designed to help users track their weight loss journey through conversational AI coaching. We take your privacy seriously. This policy describes what information we collect, how we use it, who we share it with, and your rights regarding your data.

2. Information We Collect

2.1 Information You Provide Directly

When you create an account and use the app, we collect:

Account & Profile Data:

• Apple Sign-In identifier (used to link your account across sessions)
• First and last name
• Age, gender, height (in centimeters)
• Current weight and target weight
• Unit system preference (metric or imperial)
• Dietary preferences (e.g., vegetarian, vegan, gluten-free)
• Dietary restrictions (e.g., allergies, intolerances)

Chat Messages:

• All text messages you send to the AI coach
• Timestamps of each message
• Chat history and conversation context

Food Logging Data:

• Meal entries and timestamps
• Food item names and portions
• Nutritional information (calories, protein, carbohydrates, fat)
• Tags and categories you assign to meals

Weight Tracking & App Settings:

• Weight entries and dates with associated notes
• Target weight goals
• Coaching style preferences
• Notification preferences and timezone settings

2.2 Apple Health Data (Optional)

Apple Health integration is entirely optional and only ever active after you grant permission in the app. You can turn it off at any time in iPhone Settings → Health → Data Access & Devices.

What we read from Apple Health:

• Body weight and height
• Steps, active energy burned, and exercise minutes
• Dietary energy consumed (calories logged by other apps)

What we write back to Apple Health:

• Weights you log in the app
• Meal nutrition: calories, protein, carbohydrates, and fat

We never use Apple Health data for advertising or share it with data brokers, and we do not write it anywhere other than the destinations named in section 5.

2.3 Apple Watch

If you use the Apple Watch app, meal descriptions you dictate are converted to text by Apple's own dictation on your watch — we never receive or store audio recordings. The resulting text is relayed to your iPhone over Apple's encrypted device-to-device connection and then handled exactly like a meal you typed. Your remaining calories for the day are sent to the watch so the complication can display them.

2.4 Information We Collect Automatically

Very little. The app contains no analytics SDK, no crash-reporting SDK, and no third-party tracking libraries of any kind. Diagnostic logs stay on your device and are not transmitted to us.

Requests to our backend necessarily include standard technical information such as your IP address and app version, which our hosting provider processes to route and secure the request. If you have opted in to sharing analytics with developers in iOS Settings, Apple may provide us with aggregated, anonymised crash statistics — that is an Apple-level setting you control, and it is not linked to your account.

3. Information We Do NOT Collect

We explicitly do not collect or request:

• Location data (GPS, IP geolocation)
• Contacts or calendar data
• Advertising identifier (IDFA)
• Biometric data (fingerprints, Face ID)
• Payment information (handled by Apple App Store only)

4. How We Use Your Information

4.1 Core App Functionality

We use your data to:

• Provide AI Coaching: Your chat messages and logs are sent to Claude AI to generate personalized coaching responses
• Track Progress: Calculate statistics, display charts, and show trends in your weight and nutrition
• Personalize Experience: Use your profile data and history to provide context-aware coaching
• Generate Summaries: Create daily and periodic summaries of your progress

4.2 What We Don't Do

• We do not use your data for marketing or advertising
• We do not sell your data to third parties
• We do not profile you for purposes unrelated to weight loss coaching

5. Third-Party Services & Data Sharing

Your data is shared with the following third parties only as necessary to operate the app:

5.1 Claude AI (Anthropic)

What: Chat messages, meal data, weight entries, your user profile, and — if you have enabled Apple Health — a short summary of your recent activity such as steps and active calories

Why: To generate personalized coaching responses and meal analysis

When: Every time you chat or request meal/food analysis

Privacy: For more information, see Anthropic's Privacy Policy

5.2 Supabase (Backend Database)

What: All user data including profiles, messages, meals, weight logs, settings

Why: To store your data persistently and enable syncing across sessions

Privacy: See Supabase's Privacy Policy

5.3 Apple (App Store & Apple Health)

What: Subscription billing and receipt validation through the App Store; on-device dictation on Apple Watch; Apple Health read/write access where you have granted it

Note: we never see your payment details — all billing is handled by Apple

Privacy: See Apple's Privacy Policy

5.4 No Other Sharing

We do not share your data with analytics companies, ad networks, data brokers, or social media platforms.

6. Data Storage & Security

6.1 Local Storage (On Your Device)

What: SwiftData database stored locally on your iPhone

Protection: Encrypted by iOS's built-in encryption (Data Protection), only accessible by the app

Apple Watch complication: so your watch face can show calories remaining, two numbers — calories consumed today and your daily target — are stored in a private App Group container shared between the app, its widgets, and the watch app. No meal descriptions, chat messages, or health records are stored there.

6.2 Backend Storage (Supabase)

What: Duplicate copy of your data stored in our backend database

Protection:

• Encrypted in transit (HTTPS only)
• Encrypted at rest (Supabase database encryption)
• Row Level Security (RLS) policies restrict access to your data

6.3 Security Measures

• Encryption in transit: All data transmitted over HTTPS/TLS
• Secure authentication: Apple Sign In ensures only you can access your account
• Access controls: Backend data protected by row-level security policies
• Rate limiting: Prevents API abuse while allowing legitimate use

7. Data Deletion & Your Rights

7.1 How to Delete Your Account

You can permanently delete your account and all associated data by:

1. Opening the app → Settings → Account
2. Tap "Delete Account"
3. Confirm the deletion (requires two confirmations)

What Gets Deleted:

• ✅ All chat messages, attachments, and coaching history
• ✅ All meal entries and the individual food items inside them, with their calories and macros
• ✅ All weight log entries
• ✅ Your user profile, app settings, and preferences
• ✅ Daily summaries and memory facts
• ✅ Any scheduled Kitchen Close reminders on your device

Deleting your account does not remove data the app previously wrote into Apple Health, because that data belongs to you and lives in Apple's own store. To remove it, go to iPhone Settings → Health → Data Access & Devices → Chat to Lose Weight → Delete All Data From This App.

Deletion Timeline: Deleted immediately from both your device and our servers (cannot be undone).

7.2 Data Export

Before deleting your account, you can export your data:

1. Settings → Data → "Export Chat & Meals"
2. Choose where to save the JSON file

7.3 Your Data Rights

You have the right to:

• Access: Request a copy of all data we hold about you
• Export: Download your data in machine-readable format (JSON)
• Deletion: Delete your account and all data permanently
• Correction: Update your profile information

7.4 Responding to Data Requests

For requests to exercise these rights, contact: hello@chattoloseweight.com. We will respond within 30 days.

8. Health & Medical Disclaimers

Who Should NOT Use This App

Do not use this app if you have or suspect:

• Eating Disorders: Anorexia, bulimia, binge eating, or other restrictive eating patterns
• Pregnancy or Breastfeeding: Calorie and macro recommendations may not be appropriate
• Serious Medical Conditions: Diabetes, heart disease, kidney disease requiring medical supervision
• Medication Interactions: If weight loss may interact with your medications
• Mental Health Crises: If experiencing suicidal thoughts or severe depression

Age Restrictions

This app is intended for users 18 years and older only. By using this app, you confirm that you are at least 18 years of age.

Your Responsibility

By using this app, you acknowledge that you have read these disclaimers and are not using the app for a prohibited condition. If in doubt, consult a doctor. This app is a tool for self-directed wellness, not medical treatment.

9. Data Retention

How Long We Keep Your Data

Active Account: Data is stored as long as your account is active and syncs between your device and backend.

After Account Deletion: All data is removed from your device and our database immediately. No archival or backups of deleted data are kept.

System Backups: Supabase may retain encrypted backups for disaster recovery (typically 7-30 days), but these become inaccessible after deletion.

10. International Compliance

GDPR (European Users)

If you are in the EU, you have rights under the General Data Protection Regulation:

• Right of Access and Data Portability
• Right of Erasure (delete your account)
• Right of Rectification (correct inaccurate data)
• Right to Withdraw Consent

To exercise GDPR rights, contact: hello@chattoloseweight.com

CCPA (California Users)

California residents have rights to know what data is collected, delete data, and opt-out of sales (we don't sell data). Contact: hello@chattoloseweight.com

11. Policy Changes

We may update this privacy policy to reflect changes in our practices, technology, or legal requirements.

How We'll Notify You: We'll post updates to this policy in the app or via email. Continued use after changes constitutes acceptance of the updated policy.

12. Contact & Questions

For questions or concerns about this privacy policy or your data:

Email: hello@chattoloseweight.com

Response Time: We will respond within 30 days.