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Privacy Policy

Effective date: March 5, 2026

Komichi ("we", "our", "us") operates the website at app.komichi.io, the marketing site at komichi.io, and the Komichi Web Importer browser extension (collectively, the "Service"). This Privacy Policy explains what data we collect, how we use it, and your rights.

1. Information We Collect

Account information

When you create an account we collect your email address and, if you sign in via Google or Discord, your name and profile picture as provided by those services.

Content you import

When you import text through the website or the browser extension we store the title, author, category, source URL, and the text content you provide. This data is associated with your account.

Learning activity

We record your reading progress, word interactions (lookups, translations, known-word markings), and usage statistics such as tokens consumed. This data is used to power features like vocabulary tracking and leaderboards.

Browser extension

The Komichi Web Importer extension accesses page content only when you explicitly click "Extract Article", "Use Selection", or "Pick Section". It does not monitor browsing activity, collect data in the background, or run on pages you have not interacted with. Extracted text is sent to our server solely for import into your library. A login session token is stored locally in your browser's extension storage.

Automatically collected data

Our hosting provider (Vercel) may collect standard server logs including IP addresses, browser type, and request timestamps. We use Plausible Analytics, a privacy-focused analytics tool that does not use cookies and does not track individual users.

2. How We Use Your Data

  • To provide and improve the Service (reading, vocabulary tracking, imports)
  • To authenticate you and keep your account secure
  • To display leaderboards and learning statistics
  • To send transactional emails (password resets, account notifications)
  • To respond to support requests

We do not sell your personal data. We do not use your data for advertising.

3. Data Sharing

We share data only with the following service providers, solely to operate the Service:

  • Supabase — authentication, database hosting, and file storage
  • Vercel — website hosting
  • OpenAI — AI-powered features such as translations and text-to-speech (text snippets are sent to their API; see OpenAI's privacy policy)
  • Stripe — payment processing (we do not store your card details)

We will not share your data with any other third party unless required by law.

4. Data Storage and Security

Your data is stored in Supabase-managed infrastructure. We use row-level security policies to ensure users can only access their own data. All connections use HTTPS. Authentication tokens are validated server-side on every request.

5. Your Rights

You can:

  • Access and export your data by contacting us
  • Delete your account and all associated data by contacting us
  • Withdraw consent for optional data processing at any time

To exercise any of these rights, email [email protected].

6. Cookies

We use essential cookies only for authentication (Supabase session cookies). We do not use tracking cookies or third-party advertising cookies.

7. Children

The Service is not directed at children under 13. We do not knowingly collect data from children under 13.

8. Changes to This Policy

We may update this policy from time to time. We will notify registered users of material changes via email. The "effective date" at the top of this page reflects the latest revision.

9. Contact

If you have questions about this Privacy Policy, contact us at [email protected].

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