Privacy Policy

01. Introduction

Maison Dynamics Private Limited ("we", "us", or "our") respects your privacy. This Privacy Policy explains how information is handled when you download, install, or use the One Calculator mobile application.

One Calculator is built with a privacy-by-design philosophy: calculations, scientific expressions, financial data, and mathematical formulas remain strictly on your local device.

02. Calculation Data (100% Local On-Device)

We do NOT transmit, upload, collect, log, or store your calculation expressions or results on external servers. You can use the application entirely offline without an active internet connection.

03. Information Stored Locally on Your Device

One Calculator uses local device storage (such as Android SharedPreferences and iOS UserDefaults) solely to preserve your application preferences:

• Calculation History: Saved locally for your convenience. You can clear your calculation history at any time from the app Settings.
• User Preferences: Theme Mode (Light / Dark / System), Angle Unit (DEG / RAD), Decimal Precision, Thousands Separator, and Haptic Feedback vibration toggles.
• Entitlement Cache: Local cached receipt of your active Lifetime purchase to enable offline verification without requiring continuous network checks.

This data is never shared with or sold to third parties.

04. In-App Purchases & Payment Security

Purchases of One Calculator Lifetime (or any optional subscriptions) are processed exclusively through the official platform billing systems: Google Play Billing (for Android) and Apple In-App Purchases (for iOS).

Maison Dynamics Private Limited does NOT collect, receive, or store your credit/debit card numbers, bank account numbers, UPI PINs, or store passwords. All transaction processing is governed directly by Google's or Apple's privacy policies.

05. Advertising & Third-Party Services

For users on the Free tier, third-party advertising SDKs (such as Google AdMob) may collect standard anonymous device identifiers (such as Google Advertising ID / IDFA) and performance diagnostics to serve and measure non-intrusive advertisements in compliance with platform requirements.

• Paid Lifetime users receive a 100% Ad-Free experience and completely bypass advertising SDK initialization.
• We do not share any user calculation formulas or history with advertisers.

06. Children's Privacy

One Calculator is a general mathematical utility suitable for students, professionals, and everyday users. We do not knowingly collect personally identifiable information from children under the age of 13.

07. Data Retention & Your Rights

Because your mathematical calculations and history are stored exclusively on your device, you have complete control over your data:

• You can clear all calculation history instantly via Settings → Clear Calculation History.
• Uninstalling the application immediately deletes all locally stored preferences and history from your device.

08. Changes to this Privacy Policy

We may update this Privacy Policy from time to time to reflect operational or regulatory improvements. The latest version and effective date will always be publicly available at this URL and accessible directly within the application.