Last updated: 9 July 2026
Equation X (“the app”, “we”) is a math and logic challenge app published by KheniTech. This policy explains what personal data we collect, why, and the choices you have. By using the app you agree to this policy.
| Data | Why |
|---|---|
| Email address | To create and secure your account and sign you in (via Firebase Authentication, including Google and Apple sign-in). |
| Display name | Shown on the leaderboard and in duels so other players can recognise you. |
| Account ID | A unique identifier that links your profile, stats and gameplay together. |
| Gameplay data | Your answers, points, level, streak, and duel history — the core of the game. |
| Push notification token | If you enable notifications, a device token so we can alert you about duels. Stored privately; never shown to other users. |
We do not collect your precise location, contacts, or photos. The app contains no ads and no third-party advertising or analytics SDKs; we do not use the Android Advertising ID (AAID), the Apple IDFA, or any advertising or tracking identifiers, and we do not track you across other apps or websites.
Solely to operate the app: authenticate you, run challenges and 1‑v‑1 duels, maintain leaderboards and stats, and (optionally) send you duel notifications. We do not sell your data or use it for advertising.
We use Google Firebase (Authentication, Cloud Firestore, Cloud Functions, Cloud Messaging) as our backend infrastructure. Data is processed on Google’s servers under Google’s terms. We do not share your data with any other third parties, and we do not sell your data. We may disclose data where required by law.
Because Google Firebase operates globally, your data may be stored and processed on servers located outside your country of residence, including in the United States. We rely on Google's infrastructure and its contractual and technical safeguards to protect your data wherever it is processed.
Notifications are optional. You can decline them when asked, or turn them off any time in your device settings. Declining does not limit any other feature of the app.
You can permanently delete your account and all associated data at any time, in‑app: Profile → Delete account. This removes your profile, stats, submissions, duel participation and push token, and deletes your authentication record. The action is immediate and cannot be undone.
To request account and data deletion without opening the app, email us at contact@khenitech.com or visit our support page; we will delete your data within 30 days. You may also ask us to access or correct the personal data we hold about you, or withdraw consent for notifications, using the same contact.
We keep your data while your account exists. When you delete your account, your personal data is removed as described above. Anonymous or aggregated records that no longer identify you may be retained.
Data is transmitted over encrypted HTTPS/TLS connections and stored using Google Firebase’s security infrastructure with access controls that prevent other users from reading your email or notification token.
The app is not directed at children under 13 (or the minimum age of digital consent in your country). We do not knowingly collect personal data from children under that age; if we learn that we have, we will delete it promptly. Parents or guardians with concerns can contact us at contact@khenitech.com.
We may update this policy; material changes will be reflected by the “Last updated” date above.
Questions or data requests: contact@khenitech.com.