Privacy Policy

Effective date: July 1, 2026  ·  Last updated: July 3, 2026

1. Who we are

Krin ("krin.", "we", "us", or "our") is an AI-powered homework organization app for teens aged 13–18, operated by Krin App Inc. This Privacy Policy explains how we handle information when you use the Krin mobile application or visit krinapp.com (collectively, the "Service").

If you have questions, contact us at hey@krinapp.com.

2. Information we collect

Anonymous account identifier

When you first open Krin, we create an anonymous account using Supabase's anonymous authentication. This generates a random user ID. No email address, name, phone number, or any personally identifiable information is required.

Date of birth

During onboarding, we ask for your date of birth to confirm you meet our 13+ age requirement. Your date of birth is stored in your account, associated only with your anonymous user ID.

Task data and onboarding answers you provide

When you add assignments by typing, pasting, or describing them, we store that task data (title, subject, due date, time estimate) in your account on Supabase servers so it persists across sessions. We also store your answers to the onboarding questions, which we use to personalize your experience. This data is associated only with your anonymous user ID — not with any real-world identity.

Photos you take

When you snap a photo to capture an assignment, that image is streamed directly to our AI processing service (Anthropic Claude API via a Supabase Edge Function) to extract task information. Photos are never stored on our servers. The image is processed in memory and discarded immediately after parsing. We do not retain, train on, or share your photos.

Subscription and payment information

If you subscribe to Krin Premium, payments are handled by RevenueCat and the App Store (Apple) or Google Play. We never see or store your payment card details. RevenueCat provides us with a subscription status (active/expired) and a pseudonymous subscriber ID. See RevenueCat's privacy policy.

Analytics

We use PostHog to understand how people use Krin (e.g., which screens are visited, which features are used, where users drop off). Analytics events are tied to your anonymous user ID only. PostHog never receives your date of birth, onboarding answers, or task content.

Error reporting

We use Sentry to capture app crashes and errors automatically. Sentry may receive device type, OS version, and a stack trace, but is configured to exclude personally identifiable information.

Notifications

If you grant notification permissions, reminders are scheduled locally on your device using Apple's on-device notification system. No push token is generated, no server sends these reminders, and no third party — including advertisers — ever sees this data.

3. How we use information

• To provide and improve the Krin app and its features.
• To sync your tasks across app sessions.
• To send push notification reminders you have configured.
• To understand aggregate usage patterns and improve the product.
• To diagnose and fix technical errors.

We do not use your information to show you ads, profile you for marketing, or sell to third parties.

4. Children and teens (under 18)

Krin is designed for users aged 13 and older. We do not knowingly collect personally identifiable information from children under 13. If you are under 13, please do not use Krin.

Because Krin uses anonymous authentication, we do not collect verifiable parental consent information. We encourage parents to review this policy with their teens and contact us at hey@krinapp.com with any concerns.

5. Data sharing

We share data only with the service providers necessary to operate Krin:

• Supabase — database and authentication (servers in the United States).
• Anthropic — AI processing of photos you submit for parsing. Images are not retained by Anthropic beyond the API request.
• RevenueCat — subscription management.
• PostHog — product analytics (anonymized).
• Sentry — error reporting.

Homework reminders are scheduled entirely on your device and are never sent through a third-party notification service — no data is shared for this feature.

We do not sell, rent, or broker your data to any third party.

6. Data retention and deletion

Your task data is retained as long as your anonymous account exists. You can permanently delete your account and all associated data at any time from the You → Delete Account screen in the app. Deletion is immediate and irreversible.

Analytics events in PostHog and crash reports in Sentry may be retained for up to 12 months for product improvement purposes.

7. Security

All data is transmitted over HTTPS/TLS. Your task data is stored in Supabase with Row Level Security (RLS) policies that ensure each user can only access their own data. Photos are processed in ephemeral memory and never written to disk.

8. Your rights

Depending on where you live, you may have rights to access, correct, or delete your personal data. Since Krin stores data anonymously, the most effective way to exercise these rights is to delete your account in-app, which removes all data immediately. For other requests, contact hey@krinapp.com.

9. Changes to this policy

We may update this Privacy Policy from time to time. When we do, we'll update the "Last updated" date at the top of this page and, for material changes, notify you via an in-app message.