**Last updated:** 2026-05-08
## Privacy Policy
This Privacy Policy explains how **Sennin — JLPT Japanese Vocab** (“**Sennin**”, “**we**”, “**us**”) collects, uses, and shares information when you use our mobile application (the “**App**”).
If you have questions, contact us at: **wintervaultstudio@gmail.com**
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## 1) Information we collect
### A) Account & authentication
- **Google Sign-In information** (basic profile data such as your Google account identifier and email, depending on what you approve) to authenticate you and associate your subscription status where applicable.
### B) App content you create
- **Japanese vocabulary study data** you generate in the App, including decks, study progress, spaced-repetition scheduling, session history, and related preferences.
- This content is stored **primarily on your device** (local database).
### C) Purchases & subscriptions
- If you subscribe to Pro, we process **purchase/subscription information** via **Google Play Billing** (for example, purchase tokens and subscription status) to activate and maintain Pro features.
- If server-side verification is enabled, our **backend** may receive a **purchase token** and related subscription metadata to confirm entitlement. We do not use this to read your vocabulary or notes.
### D) Notifications (optional)
- If you enable study reminders, we may store your **notification preferences** (for example, which reminders are enabled and scheduling choices you set in the App).
### E) Backup / export (optional, user-initiated)
- If you use backup or export features, you may create a **file** containing a snapshot of your local study data. That file is shared or stored **only where you choose** (for example, your device storage or a destination you pick).
### F) Diagnostics / analytics (limited)
- We may collect **basic app events** (for example, feature usage) to improve the App.
- We do **not** intentionally collect sensitive personal information through analytics.
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## 2) How we use information
We use information to:
- Provide core functionality (Japanese vocabulary study, decks, progress, and preferences).
- Authenticate you and protect the App.
- Provide Pro features and verify subscription status.
- Send optional reminders you enable.
- Improve reliability and user experience.
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## 3) Where your data is stored
- **On-device storage:** Most of your study data is stored locally on your phone.
- **Network requests:** Some features require internet access (for example, Google Sign-In, Google Play Billing, optional subscription verification, and limited analytics). Data sent to our backend is used only to fulfill the request and operate the service.
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## 4) Sharing of information
We do not sell your personal information.
We share information only as needed with:
- **Google** (Google Sign-In; Google Play Billing for subscriptions).
- **Service providers** that help us operate the App (for example, hosting for subscription verification) strictly for providing the service.
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## 5) Data retention
- **Local data:** Stays on your device until you delete it in-app or uninstall the App.
- **Backend logs / processing:** We retain only what is necessary to operate and secure the service and comply with legal obligations.
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## 6) Your choices & controls
You can:
- Use the App without enabling optional features (such as reminders).
- Disable notifications anytime in device settings.
- Delete local app data by clearing the App’s storage or uninstalling.
- Request help deleting backend-associated data by emailing **wintervaultstudio@gmail.com**.
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## 7) Children’s privacy
Sennin is not directed to children under 13, and we do not knowingly collect personal information from children.
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## 8) Security
We use reasonable safeguards to protect information. No method of transmission or storage is 100% secure.
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## 9) Changes to this policy
We may update this Privacy Policy. We will update the “Last updated” date above.
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## 10) Contact
Email: **wintervaultstudio@gmail.com**
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# Terms of Service (Sennin — JLPT Japanese Vocab)
**Last updated:** 2026-05-08
## 1) Acceptance of terms
By using Sennin, you agree to these Terms.
## 2) The service
Sennin provides tools to study **Japanese vocabulary** with a focus on **JLPT-oriented** learning. The App is an independent study aid and **does not** replace official JLPT registration, testing, or results. **JLPT** is a trademark of its respective owners; Sennin is not affiliated with or endorsed by those owners.
## 3) Accounts
If you sign in with Google, you are responsible for maintaining access to that account.
## 4) Pro subscriptions
- Pro subscriptions are processed by **Google Play**.
- Pricing, trial terms (if offered), renewal, and cancellation are managed in your Google Play account.
- You can manage or cancel in Google Play’s subscription settings.
## 5) Acceptable use
You agree not to misuse the App, interfere with its operation, or attempt unauthorized access.
## 6) Intellectual property
The App and its content (including software and bundled materials) are owned by us or our licensors. You may not copy or redistribute the App except as permitted by law.
## 7) Disclaimer
Sennin is provided “as is” without warranties. We do not guarantee uninterrupted or error-free operation. Study outcomes depend on your effort; we do not guarantee exam results.
## 8) Limitation of liability
To the maximum extent permitted by law, we are not liable for indirect, incidental, or consequential damages.
## 9) Termination
You may stop using the App at any time. We may suspend or terminate access if required to protect the service or comply with law.
## 10) Contact
Questions about these Terms: **wintervaultstudio@gmail.com**