Privacy Policy – Compound Interest Calculator

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Last Updated: 13 February 2026

This Privacy Policy explains how Compound Interest Calculator (“we”, “us”, “our”) collects, uses, stores, and protects information when you use our mobile application (the “App”).

You can use Compound Interest Calculator entirely locally. We do not require you to create an account or sign in for any features. All core calculator features work without you providing a name, email address, or password.

We are committed to protecting your privacy and complying with the UK General Data Protection Regulation (UK GDPR), the Data Protection Act 2018, and other applicable data protection and electronic communications laws.

  1. Data Controller

Yeap Digital Ltd
8 Albany St.
Edinburgh EH1 3QB
United Kingdom

Email: yeap@yeapdigital.co.uk

If you have any questions about this Privacy Policy or how we handle your data, please contact us using the details above.

  1. Information We Collect

We aim to collect only the minimum information needed to provide and improve the App.

2.1 Information You Enter in the App (“Calculation Data”)

You do not need to create an account or provide contact details to use the App.

When you use the calculators, we process calculation inputs and outputs locally on your device to:

  • Show you results,
  • Maintain your local history and favourites.

Storage Location:

  • All calculation history and favourites are stored locally on your device.
  • We do not store your personal calculation history in the cloud.
  • We do not offer user accounts or cloud synchronization.

2.2 Automatically Collected Information

When you use the App, certain information is collected automatically to help us diagnose issues and improve the user experience.

Device Information

  • Device model and type
  • Operating system and version (e.g., iOS version)
  • App version
  • Advertising ID (IDFA): Collected ONLY if you explicitly allow tracking via the App Tracking Transparency prompt.

Usage Data (Analytics)
We use privacy-centric analytics (Google Firebase) to understand general usage trends.

  • App opens and session duration
  • Which calculator types are used (aggregated counts)
  • General interaction events (e.g., button taps)
  • Crash logs and performance data (to fix bugs)

We do NOT collect precise GPS location, personal names, emails, or the specific financial numbers you enter into the calculators within our analytics.

2.3 Subscription and Purchase Information

If you purchase a premium subscription via the App:

  • We receive details related to your subscription status (e.g., active, expired) and purchase receipts via our provider (RevenueCat) and Apple.
  • This is used solely to unlock premium features on your device (such as removing ads).
  • We do not receive your payment card details; those are handled securely by Apple.
  1. How We Use Your Information

We use the information we collect for the following purposes:

3.1 Core App Functionality

  • Providing calculator features and displaying results locally.
  • Maintaining your preferences (e.g., currency, theme) on your device.
  • Unlocking premium features for subscribers.
  • Keeping the App secure and preventing misuse.

3.2 App Improvement and Analytics

  • Understanding which features are most popular.
  • Identifying and fixing crashes and bugs.
  • Improving performance.

This processing relies on our legitimate interests to improve our product.

3.3 Advertising (Google AdMob)
The free version of the App uses Google AdMob to show advertisements.

  • Non-Personalised Ads: By default, or if you decline tracking, ads are contextual (based on the app topic) and do not track you across other apps.
  • Personalised Ads: We only use your IDFA to show personalised ads if you explicitly consent via the iOS App Tracking Transparency prompt.

3.4 Communications and Support

  • Responding to support requests you send us (e.g., via email).
  • We do not send marketing emails from the App because we do not collect email addresses within the App itself.

3.5 Push Notifications
If you grant permission, we may use push notifications to send you:

  • Financial reminders or usage tips.
  • Updates about new calculators or features.
  • Retention rewards or milestones.

Notifications are optional. You can manage strictly in your device settings.

  1. Legal Bases for Processing (UK GDPR)

We process your data under the following legal bases:

Contract Performance

  • To provide the core local calculator functionality.
  • To unlock premium features you have purchased.

Legitimate Interests

  • To maintain and improve our App via anonymous analytics.
  • To prevent fraud and misuse.
  • To display contextual advertising (in the free version).

Consent

  • For personalised advertising and tracking (if you opt-in via device settings).
  • For push notifications (if you opt-in via system prompt).
  • For certain non-essential analytics identifiers.

Legal Obligations

  • To comply with legal requirements (e.g., tax/accounting for subscriptions).
  1. Third-Party Services

We use trusted third-party providers to help us operate the App.

5.1 Firebase (Google LLC)
Used for Analytics and Crashlytics.

  • Collects anonymous usage data and crash reports.
  • Does NOT store your personal calculation history or favourites.
  • Servers may be located globally (USA, EEA, UK).

5.2 RevenueCat
Used to manage in-app purchases.

  • Processes anonymous purchase receipts to validate your premium status.
  • Helps us restore your purchase if you change devices.

5.3 Google AdMob (Google LLC)
Used to display advertisements in the free version.

  • May collect device identifiers (like IDFA) for ad performance and personalisation (subject to your consent).
  • For more information on how Google uses data, please visit Google’s Partner Privacy Policy.
  1. Data Storage and Retention

6.1 Where Your Data Is Stored

  • Calculation Data: Stored locally on your device.
  • Analytics Data: Stored on Firebase servers (Google), often processed in the US/EEA/UK.

6.2 Retention

  • Local Data: Retained on your device indefinitely until you delete it or uninstall the App.
  • Analytics Data: Retained for a limited period (typically 2-14 months) for trend analysis, then aggregated or deleted.
  • Subscription Data: Retained as required for legal/accounting purposes.
  1. Data Deletion

Since we do not store your personal calculation data on our servers, there is no central “account” to delete.

Your Options:

  • Reset Data: Use the “Reset Data” or “Clear History” options in Settings to wipe all locally stored history and favourites instantly.
  • Uninstall: Uninstalling the App permanently removes all local data associated with it.
  1. Your Rights Under UK Data Protection Law

You have the following rights:

  • Right of Access: You already possess your data on your device.
  • Right to Erasure: You can delete your data by resetting or uninstalling the App.
  • Right to Object / Opt-Out: You can opt-out of personalised ads via the iOS tracking prompt or Settings.
  • Right to Withdraw Consent: Use iOS Settings > Privacy to revoke tracking or notification permissions at any time.

To exercise other rights (e.g., regarding support emails), contact us at yeap@yeapdigital.co.uk.

  1. Children’s Privacy

Compound Interest Calculator is not intended for children under 13 years of age. We do not knowingly collect personal information from children under 13.

  1. International Data Transfers

Your anonymous analytics, advertising, or subscription data may be processed in countries outside the UK (e.g., USA) by our providers (Google, RevenueCat). We rely on standard contractual clauses or adequacy decisions to ensure protection.

  1. Changes to This Privacy Policy

We may update this Privacy Policy to reflect changes in our App or legal requirements. We will update the “Last Updated” date at the top of this policy. Your continued use of the App constitutes acceptance of changes.

  1. Contact Information

Yeap Digital Ltd
Email: yeap@yeapdigital.co.uk

  1. Summary of Key Points
  • Local First: All history and favourites live on your device. No cloud sync.
  • No Accounts: No Sign In required. No user passwords.
  • AdMob: We use Google AdMob for ads; personalisation is optionally based on your consent.
  • Analytics: We use Firebase for anonymous usage stats and crash reporting only.
  • Notifications: Optional reminders if you permit them.
  • Premium: Unlocks features locally; purchase managed by RevenueCat/Apple.

By using Compound Interest Calculator, you acknowledge that you have read and understood this Privacy Policy.