Privacy Policy

ℹ️ 1. About This App

GST Calculator (package ID: app.calc.gst) is a free Android application for Indian businesses, traders, accountants, and individuals to compute Goods and Services Tax (GST) accurately and instantly.

Core Features

• GST Calculation (Inclusive & Exclusive): Net/Base amount, CGST, SGST, IGST for all slabs — 0%, 0.25%, 3%, 5%, 12%, 18%, 28%.
• Intra-State vs Inter-State: Toggle CGST+SGST vs IGST splits.
• GSTIN Format Validator: Validates 15-digit GSTIN structure on-device (no network lookup).
• Calculation History: Up to 50 past calculations stored locally.
• PDF Export: Generate a GST Tax Invoice PDF and print or share it.
• Share Breakdown: Share formatted GST summary via any app.
• GST Explanation: In-app reference guide for GST slabs and tax types.

📊 2. Information We Collect

What We Collect (and Where It Stays)

💾 3. Local Data Storage

GST Calculator uses Android’s SharedPreferences to store data exclusively on your device. This data is never transmitted to our servers, never shared with any third party, deleted when you uninstall, and clearable via Settings → Apps → GST Calculator → Clear Data.

What Is Stored Locally

• Calculation History (gst_calculation_history): Up to 50 GST computation results as JSON.
• First Install Timestamp (first_install_timestamp): Unix timestamp of first launch — used only for the 7-day no-ad grace period.
• Ad Frequency Timestamps (last_app_open_ad_shown_timestamp, last_interstitial_ad_shown_timestamp): Used solely to enforce frequency capping.

📢 4. Google AdMob Advertising

GST Calculator is a free app supported by advertisements served by Google AdMob. Ad formats used:

• Banner Ads: Bottom of main screen.
• App Open Ads: On app launch (frequency-limited).
• Interstitial Ads: After PDF export or share actions (strictly frequency-limited).

Our User-Friendly Ad Frequency Policy

What AdMob May Collect

• Android Advertising ID (GAID) — resettable in Android Settings.
• IP address and approximate location (geo-targeted ads).
• Device type, OS version, app version.
• Ad interaction data (clicks, impressions).

AdMob’s data practices are governed by Google’s Privacy Policy.

📈 5. Firebase Analytics

We use Google Firebase Analytics to understand anonymous usage patterns and improve the app. It operates anonymously — no individual user is identified.

What Firebase Analytics May Collect

• Anonymous session data: app opens, session duration, screens viewed.
• Device type, OS version, app version, language, country (not city).
• Custom event names (e.g., “pdf_exported”) — without the actual amounts or values.

Governed by Google Firebase’s Privacy Policy.

🔔 6. Firebase Cloud Messaging (Push Notifications)

GST Calculator uses Firebase Cloud Messaging (FCM) to send optional push notifications (app updates, new features, GST filing reminders).

• On Android 13+, the app requests notification permission at first launch. You may deny it without losing any functionality.
• FCM assigns an anonymous device token (random identifier, no PII) to your device.
• We do not associate FCM tokens with personal data.

Governed by Google Firebase’s Privacy Policy.

🔐 7. Device Permissions

🔍 8. GSTIN Validator

The GSTIN Format Validator checks whether a 15-character GSTIN matches the correct structural format defined by Indian GST regulations using a regular expression on-device.

Note: Format validation only — does not verify GSTN registration or business active status.

📄 9. PDF Generation & Sharing

PDF Export

PDFs are generated entirely on-device. They are not uploaded to any server. You are presented with the system print dialog to save, print, or share. Business name or GSTIN optionally entered for the PDF are used only to populate the document and are not stored or transmitted.

Share Breakdown

The Share feature generates a formatted text summary and opens the Android system share sheet. We do not intercept, store, or have access to what you share or where.

🕐 10. Calculation History

The app stores your last 50 GST calculations locally. Each record contains: base amount, CGST, SGST, IGST, total, GST rate, calculation mode, sale type, and timestamp.

This data is stored only on your device and is never transmitted. You can clear all history at any time from the History screen in the app.

👶 11. Children’s Privacy

GST Calculator is designed for adults and businesses. It is intended for users who are at least 13 years of age and is rated Everyone on Google Play. Since we do not collect personal information from any user, there is no risk of inadvertently collecting data from minors.

🛡️ 12. Data Security

• Local Storage: SharedPreferences is sandboxed and accessible only by the GST Calculator app.
• No Cloud Backend: We operate no proprietary backend servers or databases.
• Third-Party Security: Data transmitted to Google is encrypted using TLS/HTTPS. Google is ISO 27001 and SOC 2 certified.
• App Security: Signed with a private keystore and distributed only through Google Play (which security-scans all APK/AAB files).

🔗 13. Third-Party Services

⚖️ 14. Your Rights & Choices

Clear App Data

Android Settings → Apps → GST Calculator → Storage → Clear Data

Opt Out of Personalised Ads

Android Settings → Privacy → Ads → Opt out of Ads Personalization (Android 12-) or Delete Advertising ID (Android 13+)

Disable Notifications

Android Settings → Apps → GST Calculator → Notifications → Off. All core features remain functional.

Data Access / Deletion

Since we store no personal data on our servers, there is nothing to access or delete on our end. For Google-held data, visit myaccount.google.com/data-and-privacy.

🔄 15. Changes to This Privacy Policy

We may update this policy to reflect new features, SDK changes, or legal requirements. When we make significant changes we will update the effective date at the top, optionally send an FCM notification, and update the Play Store listing link. Continued use of the app after changes constitutes acceptance.

📬 16. Contact Us

We respond to privacy inquiries within 30 business days.