Math-Nerd Privacy Policy

Effective date: June 3, 2026

This policy describes how the Math-Nerd iOS app (“Math-Nerd”, “the app”) and the Math-Nerd API (“the API”) operated for the app handle information. The API is the backend service that provides daily puzzles, leaderboards, and account recovery.

Summary

• Math-Nerd does not sell your data or use third-party advertising or analytics SDKs.
• Daily play and leaderboards require sending gameplay and a display name to our servers.
• Sign in with Apple is optional and used only for account recovery across devices.
• Practice Mode purchases are processed by Apple; we do not receive your payment card details.

Information we collect

On your device (local storage)

The app stores the following on your iPhone using Apple’s standard on-device storage (UserDefaults):

• A random account identifier created on first launch
• Your claimed leaderboard username (if you choose one)
• Game progress such as daily completion, streaks, and local score history
• Settings such as sound and haptics preferences
• In developer builds only: a custom API server URL you enter in Settings

This data stays on your device unless you use online features described below.

Sent to our servers

When you use online features, the app communicates with the API over HTTPS. We store:

• Account identifier — links your device to your server profile
• Username — the display name you claim for leaderboards (public on leaderboards)
• Daily scores — including puzzle date, difficulty, solve time, efficiency score, and equation tiles submitted for server verification
• Aggregated stats — such as streaks and bests derived from your scores
• Apple user identifier — only if you choose “Sign in with Apple” for account recovery (a stable ID from Apple, not your name or email unless Apple shares it in the token flow you approve)

Leaderboard entries are visible to other players (username and score-related fields for that puzzle or period). We do not collect your precise location, contacts, photos, microphone, or browsing history.

Automatically processed

• IP address — may be seen by our hosting provider and used for rate limiting and abuse prevention
• Request metadata — standard web server logs (timestamps, paths) for operations and security

How we use information

• Provide daily puzzles and verify submitted solves
• Operate daily, weekly, and all-time leaderboards
• Register and lock your claimed username to your account
• Link and recover your account when you use Sign in with Apple
• Protect the service (rate limits, anti-cheat validation, error diagnosis)

We do not use your information for cross-app tracking or targeted advertising.

Third-party services

• Hosting — the API runs on cloud infrastructure (e.g. Railway) that processes requests on our behalf
• MongoDB Atlas — database hosting for player profiles, puzzles, and scores
• Apple — Sign in with Apple and App Store in-app purchases (Practice Mode). Apple’s policies apply to those flows

These providers process data only as needed to operate the app and are bound by their own privacy terms.

Data retention

Server-side scores and player records are kept so leaderboards and stats remain meaningful until you delete your account or we remove data for legal or operational reasons. Uninstalling the app removes local data on your device but does not by itself delete server records.

Deleting your account

You can delete your Math-Nerd account from the app at Settings → Delete account. That action:

• Removes your server profile (claimed username, optional Apple link, and linked stats)
• Removes your daily leaderboard scores associated with that username from our database
• Clears local game progress, streaks, username, and account identifier on your device and starts a fresh anonymous profile

Deletion is permanent for leaderboard identity and server-held scores. Practice Mode purchases are handled by Apple and are not revoked by account deletion. Leaderboards may still show your former username on cached devices until others refresh; server copies are removed when deletion succeeds.

If deletion fails because the app cannot reach the API, try again when you have a connection. You can also contact us (below) to request manual removal.

Your choices and rights

• You can play without claiming a username; leaderboards require a claimed name
• Sign in with Apple is optional
• You can turn off sound and haptics in Settings
• You can delete your account in Settings as described above
• You may contact us for access to, correction of, or deletion of data if in-app deletion does not work for your situation

Where applicable law provides additional rights (for example GDPR or CCPA), we will honor valid requests. Use the App Store support contact for requests we cannot complete in the app.

Children

Math-Nerd is not directed at children under 13. We do not knowingly collect personal information from children under 13. If you believe a child has provided us data, contact us and we will delete it.

Security

Production traffic uses HTTPS. Score submissions are validated on the server rather than trusted from the client alone. No method of transmission or storage is 100% secure; we work to protect data using reasonable industry practices.

International users

If you use Math-Nerd from outside the United States, your information may be processed in the United States or other countries where our service providers operate.

Changes to this policy

We may update this policy from time to time. The effective date at the top will change when we do. Continued use of the app after changes means you accept the updated policy.

Contact

For privacy questions or data requests, use the support contact listed on the Math-Nerd page in the App Store.

App: Math-Nerd · API service: math-nerd-api