Seimai Privacy Policy

Last updated: 28 April 2026

This privacy policy explains how Seimai (“we”, “us”) collects, uses, and protects your information when you use our mobile app and website. Seimai is operated by SW6 LTD (company number 11900842), registered in England and Wales with its registered office at International House, 12 Constance Street, London, E16 2DQ, United Kingdom. SW6 LTD is the data controller for personal data processed by the Service.

Information we collect

• Account information: email address, display name (optional), and password (stored as a secure hash). If you sign in with Google or Apple, we receive your email and name from those providers.
• User content: videos you request summaries for, notes you create, comments you post, channels you subscribe to, and public notes you share with other users.
• Usage data: basic logs of your activity (API requests, errors) used for debugging and tier limits enforcement. We do not track your location or browsing outside the app.
• Device information: a device token for push notifications (if you enable them) and an anonymized device fingerprint used to prevent trial abuse.

How we use your information

• To generate AI-powered summaries of YouTube videos you request.
• To send push notifications about new summaries and social activity (only if you opt in).
• To send transactional emails (email verification, trial reminders).
• To enforce subscription tier limits (e.g. monthly summary quota).
• To improve the service and investigate bugs or abuse.

Lawful basis for processing

Under the UK GDPR, we process your personal data on the following lawful bases:

• Contract (Article 6(1)(b)): processing necessary to provide the Service you've signed up for — account management, generating summaries you request, enforcing tier limits, and billing.
• Legitimate interests (Article 6(1)(f)): operational logging, security, debugging, and abuse prevention. We balance these against your interests and rights.
• Consent (Article 6(1)(a)): for optional features such as push notifications. You can withdraw consent at any time without affecting prior processing.

How we share your information

We do not sell or share your personal information with third parties for advertising. We share data only with the following service providers, strictly to operate Seimai:

• LLM providers (e.g. Google Gemini via proxy): video transcripts and your chat messages are sent to generate summaries and answers. These providers do not store the content beyond what's needed to respond to the request.
• Resend: for sending transactional emails.
• Expo Push / FCM / APNs: for delivering push notifications.
• Google / Apple: for OAuth sign-in verification only (we receive your email and name; they do not receive your Seimai activity).
• RevenueCat: for managing subscriptions (when you subscribe).

International data transfers

Some of the providers above (notably LLM providers and push services) are based outside the United Kingdom or European Economic Area. Where data is transferred internationally, we rely on safeguards permitted by the UK GDPR and EU GDPR, including UK adequacy regulations, the EU-US Data Privacy Framework where applicable, and Standard Contractual Clauses with the receiving party. You can request more detail on the specific safeguards in place by emailing us.

Public content

Notes you explicitly mark as Published are visible to other Seimai users and may appear in the public feed, on user profiles, and on the shared web page for that note. Private notes remain visible only to you.

Data retention

We retain your account data as long as your account is active. If you delete your account, we remove your personal data within 30 days. Some data (e.g. system logs) may be retained longer for debugging or legal compliance.

Your rights

Under the UK GDPR, EU GDPR, and other applicable data-protection laws, you have rights to access, correct, delete, restrict processing of, or port your personal data, and to object to certain processing. You can:

• delete your account directly from the app (Settings → Account → Delete account), which removes your personal data within 30 days;
• request a copy of your data, ask us to correct it, or ask us to restrict or stop specific processing, by emailing support@seimai.app.

If you're unhappy with how we've handled your personal data, you have the right to complain to a data-protection supervisory authority. In the UK that's the Information Commissioner's Office (ICO) — ico.org.uk/make-a-complaint. In the EEA, you can lodge a complaint with your local supervisory authority.

Children

Seimai is not intended for use by children under 13. We do not knowingly collect data from children under 13.

Changes to this policy

We may update this privacy policy from time to time. Material changes will be communicated via email or in-app notification.

Governing law

This policy and any disputes relating to it are governed by the laws of England and Wales, without prejudice to mandatory data-protection rights you may have under the UK GDPR, EU GDPR, or other applicable laws in your country of residence.

Contact us

Questions about this policy or requests regarding your data can be sent to support@seimai.app, or by post to SW6 LTD, International House, 12 Constance Street, London, E16 2DQ, United Kingdom.