Privacy Policy

Last updated: June 28, 2026

Abstia, LLC (“we,” “our,” or “us”) operates the Abstia mobile application (the “App”). This Privacy Policy explains how we collect, use, disclose, and safeguard your information when you use our App.

1. Information We Collect

Anonymous Use & Linking an Account

You can use Abstia anonymously, without creating an account or giving us any personal information. When you start this way, we create an anonymous account identifier so your fasts, profile, and preferences can be saved — it is not tied to your name, email, or any Google or Apple identity. Because an anonymous account belongs to the device that created it, its data cannot be recovered if you delete the App or switch devices without linking first.

At any time you can link a permanent account — by adding an email and password, or by connecting Google or Apple — to save your progress, sync it across your devices, and keep it if you change or lose a device. Linking preserves all of your existing data under the same account. Once you link, we collect the account information described below.

Account Information

When you create an account, we collect:

  • Display name
  • Email address
  • Profile photo (optional — only if you choose to add one)
  • Authentication credentials (password hash — we never store plaintext passwords)

If you sign in with Google or Apple, we receive your name and email from those providers. We do not receive or store your Google or Apple password.

Profile Information

To create an account and personalize coaching, we collect the following during onboarding:

  • First and last name
  • Birthdate
  • Height
  • Preferred units (imperial or metric)
  • Gender (male, female, or prefer not to say)

You can update any of these values at any time from the profile screen.

Fasting Data

When you use the App, we collect data you provide:

  • Fast start and end times
  • Target durations and fasting schedules
  • Fast completion status (completed or cancelled)
  • Biofeedback entries: mood (great/struggling), hunger type (physical/mental), and energy level (high/low)
  • Optional notes you add to fasts

Preferences

  • Timer display mode (countdown or count-up)
  • Theme preference (system, light, or dark)
  • Notification settings and preferences
  • Timezone

Health Data (Optional)

If you choose to connect Apple HealthKit (iOS) or Google Health Connect (Android), the App reads the following metrics from your device and stores them in your Abstia account so they can be displayed alongside your fasts and used for coaching:

  • Body weight
  • Active energy burned (calories)
  • Dietary energy consumed (calories)
  • Macronutrients: protein, carbohydrates, and fat

This connection is strictly opt-in and disabled by default. Data flows one way only — from HealthKit or Health Connect into Abstia. The integration is read-only: the App reads these metrics and does not write, modify, or delete any data in Apple Health or Health Connect. You can disconnect at any time from the App's profile settings, which stops further syncing; you can also revoke permissions directly in the iOS Health app or the Android Health Connect settings. See Section 5 (“Health Integrations”) below for the full details.

Device Information

  • Push notification token (if you enable notifications)
  • Device platform (iOS or Android)
  • Login timestamps and login count (used to surface re-engagement reminders and to diagnose sync issues)

Usage and Analytics Information

To understand how the App is used and to improve it, we collect anonymized usage and diagnostic data through Vexo Analytics — for example, which features and screens you use, in-app events, app version, and device type. This data is not used to identify you personally, and it never includes your health data.

2. How We Use Your Information

We use the information we collect to:

  • Provide and maintain the App
  • Track and display your fasting history and progress
  • Show insights and trends — including weight, calorie balance against your estimated total daily energy expenditure (TDEE), and macronutrient breakdowns — from the health data you choose to connect
  • Generate personalized AI coaching tips based on your fasting patterns
  • Send notifications you have opted into (target reached, ending soon, starting reminders, coaching tips)
  • Sync your data across devices, including companion apps such as Apple Watch and Wear OS
  • Analyze anonymized usage and diagnostics to maintain and improve the App

3. Data Storage and Security

Your data is stored securely in the cloud with strict access controls. Your data is fully isolated — only you can access your own records, even at the database level.

The App also stores data locally on your device using SQLite for offline access. Local data syncs with our servers when connectivity is available.

All data transmission is encrypted using TLS/SSL. We use industry-standard security practices to protect your information.

4. Data Sharing

We do not sell, trade, rent, or otherwise share your personal information with third parties, except:

  • Service providers: We use Supabase for authentication, data storage, and profile photo hosting; PowerSync for offline data synchronization; and Vexo Analytics for anonymized usage and diagnostic analytics. These providers process data on our behalf under strict data protection agreements. We do not share your health data with our analytics provider.
  • Legal requirements: We may disclose information if required by law or in response to valid legal processes.

5. Health Integrations (Apple HealthKit & Google Health Connect)

Abstia offers optional integrations with Apple HealthKit (on iOS) and Google Health Connect (on Android) so the App can pull health metrics relevant to your fasting practice. These integrations are entirely optional — the App works without them, and they are turned off unless you explicitly connect them from the profile screen.

What we read

When you grant permission, the App requests read access to the following data types:

  • Body mass / weight
  • Active energy burned
  • Dietary energy consumed (iOS) / Nutrition records (Android)
  • Dietary protein, carbohydrates, and fat (macronutrients)

What we write

Nothing. Abstia's health integration is read-only — the App reads the data types listed above and does not write, modify, or delete any data in Apple HealthKit or Google Health Connect. (Earlier versions could save a weight you logged in the App back to your health store; both in-app weight logging and that write-back have been removed.)

How we use it

  • Display your latest weight and today's calories burned, calories consumed, and macronutrients within the App
  • Provide richer context to our AI coaching tips (for example, flagging that nutrition may be influencing your fast)
  • Track trends over time alongside your fasting history

How it is stored and shared

Health samples pulled from HealthKit or Health Connect are synced to your Abstia account on Supabase, where row-level security ensures that only you can read them. We use PowerSync to keep the data available offline on your device. We do not sell this data, use it for advertising or marketing, share it with third parties for their own purposes, or use it for any purpose unrelated to providing the Abstia fasting experience to you. Health data is handled only by our storage and sync providers (Supabase and PowerSync); it is never sent to our analytics provider, and no other third party receives it.

Your control

  • Connect or disconnect Health at any time from the App's profile screen. Disconnecting stops all future syncs.
  • Revoke individual permissions directly in the iOS Settings > Privacy & Security > Health pane or the Android Health Connect settings.
  • Delete previously synced samples by deleting your Abstia account (see Section 8), which removes all associated health records.

Apple HealthKit disclosure

As required by Apple, we confirm: Abstia does not use HealthKit data for advertising, marketing, or other use-based data mining purposes other than improving health, medical, and fitness management, or for the purpose of health research. HealthKit data is never sold, and is never disclosed to third parties for their own use.

6. Third-Party Authentication

If you choose to sign in with Google or Apple, those services provide us with your basic profile information (name and email). Their respective privacy policies govern how they handle your data:

7. Data Retention

We retain your data for as long as your account is active. If you delete your account, we will delete your personal data within 30 days. Anonymized, aggregated data may be retained for analytics purposes.

8. Your Rights

You have the right to:

  • Access the personal data we hold about you
  • Correct inaccurate data
  • Delete your account and associated data
  • Export your data in a portable format
  • Opt out of any or all notifications at any time through the App settings

To exercise these rights, contact us at privacy@abstia.com.

9. Children's Privacy

The App is not intended for children under the age of 13. We do not knowingly collect personal information from children under 13. If we become aware that we have collected data from a child under 13, we will delete it promptly.

10. Changes to This Policy

We may update this Privacy Policy from time to time. We will notify you of material changes by posting the updated policy in the App or on our website. Your continued use of the App after changes are posted constitutes acceptance of the revised policy.

11. Contact Us

If you have questions about this Privacy Policy or our data practices, contact us at: