Privacy Policy

1. Data we collect

• Google sign-in data: your Google account identifier, email address and name. We never receive your Google password.
• Usage records: how many checks you ran each day and your credit balance.
• Purchase records: when you buy credits we store the order number, product, amount, time of payment and the payment reference. Card numbers and other payment details are handled by the payment provider and never reach the Service.
• Photos and notes you upload: solution photos, problem photos and problem notes. They are processed only while a check runs and are not stored on the Service's servers or database.
• Cookies: one that keeps you signed in (30 days) and one that verifies the sign-in flow (10 minutes). There are no advertising or tracking cookies.
• Connection data: Cloudflare, which hosts the Service, processes your IP address and browser information.

2. How we use it

• Signing you in and identifying your account
• Tracking daily free checks and credits
• Producing the results of a check
• Preventing automated requests and abuse
• Finding and fixing errors

3. How long we keep it

Account data and usage records are kept until you ask us to delete your account, and are deleted without delay once you do.

Purchase records may have to be kept for a period required by law, so they are retained separately for that period even after your account is deleted.

Uploaded photos and notes are not stored by the Service. The provider that analyzes them may keep them for a period under its own policy (see section 4).

Server logs used to diagnose errors may contain a short excerpt of a result. They are removed when the hosting provider's log retention period ends.

4. Service providers and international transfer

The Service runs on the systems of the providers below, so data may be transferred to and processed on servers outside your country, mainly in the United States.

• Cloudflare, Inc.: hosting and database. Processes account data, usage records and connection data.
• Anthropic, PBC: analysis of solutions by an AI model. Processes uploaded photos and problem notes, which may be retained for a period under Anthropic's policy.
• Google LLC: Google account sign-in.
• Toss Payments Co., Ltd. (Republic of Korea): processing credit purchases. Your name, email address and order details are passed on when you pay.

5. Your rights

You can ask to access, correct or delete your personal data, or ask us to stop processing it, at any time. Write to the address below from the email you signed in with.

You can sign out from the account menu at the top right.

6. Children

The Service is not directed to children under 14 and does not knowingly collect their personal data. If we learn that such data was collected, we delete it.

7. Changes to this policy

When this policy changes, the new version is posted on this page with an updated effective date.

8. Contact

Send privacy questions and requests to privacy@useunknot.com.