# Prep DNB – Privacy Policy (Android + iOS)
**Effective Date:** April 9, 2026
**Last Updated:** July 5, 2026
## 1. Introduction
This Privacy Policy ("Policy") explains how the Prep DNB mobile application (the "App") collects, uses, stores, and protects information. Prep DNB is a medical education app for DNB/DipNB exam preparation with previous-year question papers, important topics and keywords, MCQ practice, revision tools, and optional cloud backup of saved questions.
The App is developed and maintained by **Docodex Labs** ("Developer," "we," "us," "our"). By using the App, you agree to this Policy. If you do not agree, please discontinue use.
## 2. Summary
| Data | Where it stays | Synced to cloud? |
|------|----------------|------------------|
| Saved/bookmarked questions & personal notes | Device + Supabase (if signed in) | Yes (optional) |
| Question text preview on bookmarks | Device + Supabase (if signed in) | Yes (optional) |
| Read / unread / needs-revision status per question | Device only | **No** |
| Revision-mode review history (dates, counts) | Device only | **No** |
| Theme (light/dark) | Device only | No |
| Last selected subject / session / paper | Device only | No |
| Your email address | Supabase Auth (only if you sign in) | Yes (for account) |
| MCQ quiz session progress | In-memory during use | No |
**You can use the App fully without signing in.** Cloud sync is optional.
## 3. Information We Collect
### 3.1 Information You Provide
**Without sign-in:** The App does not require an account. You do not provide personal information unless you choose to (e.g., email us for support).
**Optional cloud sign-in:** If you use **Cloud Sync**, you enter your **email address**. We send a **magic link** (one-time sign-in link) to that email via **Supabase Auth**. We do not ask for a password. Your email is stored by Supabase as your account identifier.
**Support / feedback:** If you contact us by email, we receive your email address and message contents only.
### 3.2 Information Stored Locally on Your Device
The App stores study and preference data on your device:
- **Saved questions (bookmarks)** — subject, exam session, paper, question number, optional personal note, and a short text preview of the question
- **Read progress** — per-question status: unread, read, or needs revision
- **Revision mode** — which saved questions are in your revision queue and review metadata (local only)
- **Theme** — light or dark mode
- **Navigation state** — last selected subject, session, and paper (for convenience)
- **One-time tips** — e.g., whether a bookmark tip was shown
Local study data is saved in an app-specific file (`study_data.json`) in your device storage. Preferences use platform storage (e.g., SharedPreferences on Android).
### 3.3 Information Stored in the Cloud (Optional)
When you sign in with Cloud Sync, the following bookmark data is stored in **Supabase** (hosted PostgreSQL database) linked to your user account:
- Subject, session, paper, and question number
- Your personal note on that question
- Short question preview text
- When the bookmark was saved
**Not uploaded to the cloud:** read/unread/revision status per question, revision review dates and counts, theme, and navigation preferences.
Sync uses a **merge** strategy: bookmarks from your device and cloud are combined; deleting a bookmark on one signed-in device removes it from the cloud on the next sync.
### 3.4 Information We Do Not Collect
The App does not collect or require:
- Name, phone number, or postal address (unless you include them in a support email)
- Payment card details inside the App (purchases are handled by Apple App Store / Google Play)
- Precise GPS location
- Contacts, calendar, photos, or files
- Microphone or camera recordings
- Clinical or health records (the App provides exam study content only)
### 3.5 Analytics and Crash Reporting
As of this version, Prep DNB does **not** include third-party analytics or crash-reporting SDKs that automatically send identifiable usage data to us.
Your device OS or app store may collect diagnostics under their own policies (Apple/Google).
## 4. How We Use Information
We use information only to:
- Provide core App features (study, bookmark, revise, search, MCQ practice)
- Remember your preferences on device
- **Optional:** back up and restore your saved questions and notes across devices when you sign in
- Respond to support requests you send us
- Improve the App based on feedback you choose to share
We **do not** sell your data or use it for targeted advertising.
## 5. Cloud Sync and Internet Use
### 5.1 When the Internet Is Used
The App works **offline** for reading question papers and most study features. Internet access is used when you:
- **Sign in** — send or open a magic-link email (Supabase Auth)
- **Sync bookmarks** — upload or download saved questions and notes
- **Open external links** — e.g., NBEMS question-paper pages, full privacy policy URL
- **Download fonts** — Google Fonts may fetch font files on first use
- **Share** — you choose when to share via another app
### 5.2 Supabase
We use [Supabase](https://supabase.com) for:
- **Authentication** — passwordless email magic links
- **Database** — storing bookmark rows per user account
Supabase processes data according to their privacy policy and our configuration (Row Level Security so users can only access their own bookmarks). The Supabase project URL is configured in the App; only the **publishable (anon) key** is embedded in the client—never a secret service key.
### 5.3 Sign Out and Account Deletion
- **Sign out** — stops cloud sync; local bookmarks and notes remain on your device
- **Delete account** (from Cloud Sync) — removes your cloud bookmarks and Supabase auth account; local data on the device is not automatically deleted
## 6. Third-Party Services
| Service | Purpose | When data is sent |
|---------|---------|-------------------|
| **Supabase** | Auth + bookmark backup | Only when you use Cloud Sync |
| **Google Fonts** | Typography | May download font files over the network |
| **share_plus** | Share question text | Only when you tap Share |
| **url_launcher** | Open links in browser/apps | Only when you tap a link |
| **Apple / Google** | App distribution & billing | Per store policies |
When you share content, the destination app (WhatsApp, Mail, etc.) handles it under **its** privacy policy.
External websites (e.g., NBEMS) have their own policies; we are not responsible for them.
## 7. Data Retention
- **On device** — until you uninstall the App or clear app storage
- **In Supabase** — until you delete your account via Cloud Sync or we remove inactive accounts per operational policy
- **Support emails** — retained as long as needed to respond and maintain support history; you may request deletion
## 8. Security
We apply reasonable safeguards:
- Minimal data collection by design
- Local data protected by your device lock/biometrics
- Cloud data protected by Supabase authentication and database access rules
- HTTPS for network communication with Supabase
No method of storage or transmission is 100% secure.
## 9. Children's Privacy
Prep DNB is intended for medical students and professionals (typically 18+). We do not knowingly collect personal data from children under 13. Contact us if you believe a child has provided information.
## 10. Your Rights and Choices
You can:
- Use the App **without signing in**
- **Sign out** to stop cloud sync
- **Delete your cloud account** from the Cloud Sync screen
- **Remove local data** by uninstalling or clearing app storage
- **Avoid sharing** by not using Share features
- **Request deletion** of support emails you sent us
## 11. Changes to This Policy
We may update this Policy when the App changes (e.g., new features). The "Last Updated" date will change. Continued use after updates means you accept the revised Policy.
## 12. Contact Us
- **Developer / Data Controller:** Docodex Labs
- **Support Email:** docodexlabs@outlook.com
- **Instagram:** @docodexlabs
- **In-app:** Menu → Send Feedback
## 13. Governing Law
This Policy is governed by the laws of **India**. Disputes are subject to the jurisdiction of courts in India.
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