Privacy policy -exposure calculator

This policy describes how Exposure Calculator (“the app”, “we”) handles data.

Summary

  • We don’t create user accounts and we don’t sell or share your data.

  • Purchases are processed by Apple; entitlements are validated by RevenueCat.

  • If you choose to export to Google Sheets, your entries are sent to your Google Apps Script URL and saved in your sheet.

  • On your device we store only small settings (e.g., sheet URL, aquatint timing).

What the app stores on your device

  • Settings & small preferences:

    • Google Web App URL (so you don’t paste it each time)

    • Aquatint timing (for convenience)
      These are stored locally using standard mobile storage (AsyncStorage on React Native).

  • No contacts, photos, precise location, or background tracking.

Data sent when you export to Google Sheets (optional feature)

If you tap Export to Google Sheets, the app sends a single row to the Web App URL you provided (a Google Apps Script you deployed in your own Google account). The payload may include:

  • Date (set to today by the script)

  • Process name

  • Standard exposure time

  • Paper type (optional)

  • Ink type (optional)

  • Aquatint timing (optional)

  • Calibration inputs (baseline, first max black step, steps per stop)

Where it goes: Directly to your Apps Script /exec endpoint and into your sheet. We do not receive or retain this data on our servers.

Purchases and subscriptions

  • The app offers an auto-renewable annual subscription for access.

  • Purchases are handled by Apple (In-App Purchase). We do not receive your payment details.

  • We use RevenueCat to validate receipts and manage your active entitlement state. RevenueCat receives transaction/receipt identifiers and may collect device identifiers per their policy.

Third-party policies:

  • Apple Media Services Terms: https://www.apple.com/legal/internet-services/itunes/

  • RevenueCat Privacy: https://www.revenuecat.com/privacy

  • Google Privacy (for Sheets/Apps Script): https://policies.google.com/privacy

  • YouTube/Google (for tutorial videos): https://policies.google.com/privacy

Analytics & logging

  • We do not run our own analytics. The app platforms (Apple, RevenueCat) may record basic operational telemetry (e.g., purchase events, entitlement status).

Children

The app is not directed to children under 13. Do not use the app if you are under the applicable age of digital consent in your region without guardian permission.

Your rights

Depending on your location (UK GDPR/EU GDPR/CCPA etc.), you may have rights to access, correct, or delete your personal information.

  • Data we control: support emails you send us and the small on-device settings described above.

  • Data controlled by others: purchases (Apple), entitlements (RevenueCat), and anything in your Google Sheet/Apps Script (Google). Please contact those providers directly for their data rights workflows.

To exercise rights about data I control please contact me on the link below

Security

We use reasonable technical and organisational measures. Exported rows are sent over HTTPS to your own Google Apps Script endpoint.

Changes

We may update this policy. Changes will appear on this page with a new effective date.

Contact us.