Privacy Policy

Last updated: April 2026

This privacy policy explains how Weight Habits (“the app”) collects, uses and protects your information. This policy supplements the Add Jam Limited Privacy Policy, which applies to all Add Jam products.

What the app does

Weight Habits is a mindful eating awareness app. Each day it asks you a simple question about your eating habits. You answer Yes, No or Not sure. Optionally, you can set weight goals, track your height and weight and share your progress with friends.

Information we collect

Account information

When you sign in, we collect:

• Apple Sign-In or Google Sign-In: your email address, display name (if provided by the sign-in provider) and a unique user ID
• Anonymous sign-in: a unique user ID only. No email or name is collected unless you later link your account to Apple or Google

Profile information

You may optionally provide:

• Display name (visible to friends you invite)
• Height
• Current weight
• Target weight
• Goal type (lose, maintain or gain weight)
• Preferred units (kg/lbs/stone, cm/ft-in)

All profile information is optional. The app works without any of it.

Check-in data

Each time you check in, we store:

• Your response (Yes, No or Not sure)
• The date of the check-in

Friends and sharing

If you use the friends feature, we store:

• Friendships you create or accept (invite codes, participant IDs, display names)
• Sharing preferences (which data you choose to share with each friend)
• Encouragement messages sent between friends (from a pre-defined list, not free text)

You control exactly what you share with friends through individual toggles for check-ins, current weight and target weight. No data is shared with friends unless you explicitly enable it.

Notification preferences

If you enable evening reminders, we store your preferred reminder time. This is synced to your account so it persists across devices.

Device information

• Push notification token: used to deliver evening reminder notifications. Stored on your account and updated when your device token changes.
• Crash reports: sent to Sentry (sentry.io) when the app encounters an error. These include device type, OS version and a stack trace. They do not include your personal data or check-in responses.
• Analytics events: sent to Firebase Analytics. Events include screen views, check-in actions and feature usage. Analytics collection is disabled in development builds. Events are anonymised and cannot be linked back to your account after deletion.

How we use your information

• To provide the app’s core features (check-ins, goals, journey tracking)
• To enable friend sharing and encouragements
• To deliver push notifications (evening reminders, friend activity)
• To fix bugs and improve the app (crash reports and analytics)
• To verify your identity when you sign in

We do not sell your data. We do not show ads. We do not share your data with third parties for marketing purposes.

Third-party services

The app uses the following third-party services:

Service	Purpose	Data shared
Firebase Authentication	Sign-in and account management	Email, user ID
Cloud Firestore	Data storage	All app data (encrypted in transit and at rest)
Firebase Cloud Functions	Friend invites and encouragements	User ID, invite codes, display names
Firebase Analytics	Anonymous usage analytics	Screen views, feature events (no personal data)
Firebase Cloud Messaging	Push notifications	Device token
Sentry	Crash reporting	Device info, stack traces (no personal data)
Apple Sign-In	Authentication	Email, name (as provided by Apple)
Google Sign-In	Authentication	Email, name (as provided by Google)

All data is transmitted over HTTPS (encrypted in transit). Firestore data is encrypted at rest by Google Cloud.

Data storage and retention

Your data is stored on Google Cloud servers (Firebase) in the region configured for the project. Data is retained for as long as your account exists.

• Check-in history: retained while your account is active
• Friendships: retained while both participants have active accounts
• Crash reports (Sentry): automatically expired after 90 days
• Analytics data: aggregated and anonymised by Firebase. Individual events cannot be attributed to a user after account deletion

Your rights

You have the right to:

• Access your data: your check-in history, goals and profile are all visible in the app
• Correct your data: you can update your profile, height, weight and display name in Settings
• Delete your data: you can permanently delete your account and all associated data from Settings, or request deletion via our contact form. See our account deletion page for full details
• Export your data: contact us at team@addjam.com to request a copy of your data
• Withdraw consent: you can sign out at any time. Anonymous users can delete their data via the “Delete Data” button in Settings

For full details of your rights under GDPR, see the Add Jam Privacy Policy.

Account deletion

You can delete your account directly in the app:

1. Open the app
2. Go to the Settings tab
3. Tap Delete Account (or Delete Data for anonymous users)
4. Confirm when prompted

This permanently deletes all your data including your profile, check-in history, goals, friendships and authentication account. For full details see our account deletion page.

Children’s privacy

Weight Habits is intended for users aged 18 and over. We do not knowingly collect personal information from children. If you believe a child under 18 has provided us with personal information, please contact us at team@addjam.com and we will delete it promptly.

Changes to this policy

We may update this privacy policy from time to time. Significant changes will be communicated through the app or via email. The “Last updated” date at the top of this page indicates when the policy was last revised.

Contact us

If you have questions about this privacy policy or your data, you can reach us at:

• Email: team@addjam.com
• Contact form: addjam.com/contact
• Website: addjam.com