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‎PRIVACY_POLICY.md‎

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# Privacy Policy for Classi
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**Effective date:** 2026-04-28
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**Last updated:** 2026-04-28
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This Privacy Policy describes how **OpenPatch** ("we", "us", or "our") handles
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information in connection with the **Classi** mobile and desktop application
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("the App"). Please read this policy carefully. By using the App you confirm
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that you have read and understood it.
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---
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## 1. Who We Are
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Classi is developed and maintained by **OpenPatch**. If you have any questions
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or concerns about this Privacy Policy you may contact us at:
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- **GitHub:** <https://github.com/openpatch/classi/issues>
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---
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## 2. Summary
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> **Classi is a local-first application. It does not collect, transmit, or share
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> any personal data with us or any third party.** All data you enter — including
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> student names, grades, notes, and checklists — is stored exclusively on your
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> own device in an encrypted database file that you control.
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---
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## 3. Information the App Stores on Your Device
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To deliver its teaching-management features, Classi stores the following
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categories of data **locally on your device only**:
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| Category | Examples |
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|---|---|
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| Group / class data | Group names, academic year labels |
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| Student data | First name, last name, archived status, avatar |
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| Academic records | Grades, grade systems, grade history |
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| Notes | Free-text notes linked to students or groups |
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| Checklists | Checklist titles, items, and student-linked status |
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| Material tracking | Material names and per-student tracking status |
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| App settings | Chosen library path, auto-backup preferences, language |
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| Security credentials | Encrypted passphrase hash, recovery key (stored in the OS secure keystore) |
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None of this data is ever sent to our servers, any analytics service, or any
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third party.
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---
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## 4. Data We Do Not Collect
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We do **not** collect:
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- Names, email addresses, or any personally identifiable information about you
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as the teacher or about your students
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- Usage analytics, crash reports, or telemetry
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- Location data
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- Device identifiers or advertising IDs
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- Payment information
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The App has **no network features** and makes no outbound connections of any
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kind.
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---
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## 5. Encryption and Security
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All library data is stored in a **SQLCipher-encrypted** `.classi` database file
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protected by a passphrase you choose during first-run setup. A recovery key is
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generated at setup time so you can regain access if you forget your passphrase.
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The passphrase is stored in the device's **secure keystore**
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(`flutter_secure_storage`) and never leaves your device.
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Optionally, you may enable **biometric unlock** (fingerprint / face). In that
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case the App stores the database passphrase in the OS secure keystore under a
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biometric-protected key, using the platform biometrics API (`local_auth`). No
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biometric data is accessed or stored by the App itself — this is handled
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entirely by the operating system.
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---
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## 6. Backups and Exports
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If you enable **auto-export backups**, the App writes a `.classi-backup` file to
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a folder you select on your device. This file is a portable, encrypted copy of
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your library. It remains on your device; we have no access to it.
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You are responsible for the security of any backup files you store, share, or
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transfer (e.g. via cloud storage, e-mail, or USB).
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---
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## 7. Permissions
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The App requests only the permissions necessary to function:
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| Permission | Purpose |
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|---|---|
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| **Storage / Files (READ_EXTERNAL_STORAGE, WRITE_EXTERNAL_STORAGE, MANAGE_EXTERNAL_STORAGE on Android 10 and lower)** | Reading and writing the `.classi` library folder and backup files you choose |
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| **Biometric / Fingerprint (USE_BIOMETRIC, USE_FINGERPRINT)** | Optional biometric unlock; only requested if you enable the feature |
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No other device permissions are required or requested.
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---
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## 8. Children's Privacy
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Classi is a tool **for teachers**, not for use directly by children. Although
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teachers may enter student names and academic records, these records are stored
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locally on the teacher's device and are never transmitted. We do not knowingly
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collect any data from individuals under the age of 13 through the App.
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---
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## 9. Data Retention and Deletion
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Because all data is stored on your device, you are in full control of retention:
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- **Deleting a library:** Remove the `.classi` folder from your device to
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permanently erase all data.
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- **Uninstalling the App:** Uninstalling the App removes app-private data. If
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you stored your library in shared storage (recommended), the `.classi` folder
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will remain until you manually delete it.
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- **Secure storage:** Passphrase entries in the OS secure keystore are removed
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when you uninstall the App on most Android versions.
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---
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## 10. Third-Party Libraries
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Classi uses open-source Flutter packages to deliver its functionality. The
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libraries listed below run entirely on-device and do not transmit data:
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| Package | Purpose |
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|---|---|
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| `drift` / `sqlite3mc` | Encrypted local database |
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| `flutter_secure_storage` | Secure keystore access |
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| `local_auth` | Biometric unlock |
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| `file_picker` | Folder and file selection dialogs |
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| `easy_localization` | UI translations (English and German) |
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| `go_router` | In-app navigation |
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| `fl_chart` | Grade history charts |
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| `avatar_maker` | Student avatar creation |
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None of these libraries collect or transmit personal data.
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---
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## 11. Changes to This Policy
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We may update this Privacy Policy from time to time. When we do, we will update
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the **"Last updated"** date at the top of this document and publish the new
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version in the repository. Continued use of the App after an update constitutes
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acceptance of the revised policy.
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---
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## 12. Contact
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If you have questions, concerns, or requests related to this Privacy Policy,
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please open an issue on our GitHub repository:
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<https://github.com/openpatch/classi/issues>
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---
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*Classi is open-source software released under the
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[MIT License](LICENSE).*

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