App Privacy Policy

This is the privacy policy for the Calculator Dude Android app. It is separate from the calculatordude.com website policy, because the app supports accounts and cloud-synced favorites and therefore processes different data.

Calculator Dude (“we”, “us”) is an Android app that provides 566 calculators across 26 categories. The data controller is the sole developer operating under the name M. Hamza Hashim. For any privacy-related request (access, correction, deletion, objection, portability, or to withdraw consent), use the contact button at the bottom of this page and we will respond within 30 days.

If you do not sign in we collect nothing from you except optional, opt-in usage analytics (see the next section).

If you sign in with email or Google, we collect:

• Email address and display name — to identify your account.
• Firebase user ID (UID) — to link your favorites to your account.
• Saved favorites — calculator IDs and the timestamp you bookmarked them.
• Feature-request submissions — the title, description, and the email tied to your account, so we can follow up.

Your calculator history (what you typed and the result) is stored only on your device in a local database. It is never transmitted off-device.

We do not collect location, contacts, photos, microphone input, camera images, or device identifiers such as IMEI or MAC address. (If you opt into analytics, Firebase may use your Android Advertising ID — see the next section.)

With your explicit consent, we use Firebase Analytics and Firebase Crashlytics to understand which calculators are popular and to fix bugs. Both are OFF by default for all users. You can turn them on or off anytime in Settings → Privacy, and you are asked to choose on first launch.

• Analytics events: calculator_opened, calculated, favorite_toggled, search_submitted (length only — we do not record what you typed).
• Crashlytics: stack traces, device model, OS version.
• If analytics is enabled, Firebase may also use your Android Advertising ID (AAID) for analytics attribution; you can reset or opt out of it in your device Google settings.

Legal basis: consent under GDPR Article 6(1)(a) / UK DPA 2018. You may withdraw consent at any time with no impact on other app functionality.

Account data, favorites, and feature requests are processed by Google LLC (Firebase Firestore and Firebase Authentication) on our behalf. Analytics and crash reports are processed by Google LLC (Firebase Analytics and Firebase Crashlytics). Google acts as our processor under Google's Data Processing and Security Terms for Firebase.

We do not sell, rent, trade, or share your personal data with any other third party, and we do not use it for advertising.

Firebase services are hosted in the United States. When you use the app from the EU or UK, your data is transferred to the US under the European Commission Standard Contractual Clauses (SCCs) — Commission Implementing Decision (EU) 2021/914 — and the UK International Data Transfer Addendum, as incorporated into Google's Firebase processing terms.

• Account data, favorites, and feature requests: kept for as long as your account exists. Deleted immediately when you tap Profile → Delete account, along with your local history and preferences.
• Local history: kept on your device until you clear it (History → Clear all) or uninstall the app.
• Firebase Analytics events: retained for 14 months (Firebase default).
• Firebase Crashlytics reports: retained for 90 days.
• If you submit a feature request and later delete your account, the submission — including its title, description, and the email tied to it — is deleted along with the rest of your data.

You have the right to:

• Access — get a copy of your data. Use Profile → Export my data.
• Rectification — correct inaccurate data. Edit in-app or contact us.
• Erasure — have your data deleted. Use Profile → Delete account or contact us.
• Portability — receive your data in JSON. Use Profile → Export my data.
• Restriction / objection — pause or stop processing. Contact us.
• Withdraw consent — toggle off in Settings → Privacy any time.
• Complain to a supervisory authority — e.g. your local EU Data Protection Authority or the UK ICO (ico.org.uk).

California residents: under the CCPA/CPRA you also have the right to know what personal data we collect, the right to delete, and the right not to be discriminated against for exercising these rights. We do not sell or share personal data for cross-context behavioural advertising.

Calculator Dude is not directed at children under 13 (or 16 where local law sets a higher age of consent). We do not knowingly collect data from children. If you believe a child has created an account, contact us and we will delete it immediately.

All network traffic uses HTTPS; the app refuses cleartext connections. Firebase data is encrypted by Google in transit and at rest. Local data is protected by the Android app sandbox; cloud backup to Google Drive is explicitly disabled, as is Android 12+ device-to-device transfer. Sign-in supports email + password and Google authentication via Android Credential Manager.

We do not carry out profiling or automated decision-making that produces legal or similarly significant effects. Calculator results are computed deterministically from inputs you provide.

We will update this policy if our practices change. Material changes will prompt you in-app to renew your consent before analytics or crash reporting resume. The “Last updated” date at the top always reflects the current version.

For any privacy question or request, use the contact button at the bottom of this page — we read and respond to every message. This policy covers the Android app only; for the website, see the website Privacy Policy.