Privacy policy

Last updated: 12 November 2026

This policy describes how Dos ("we", "us") collects, uses and protects personal data when you use the Dos: drug calculations app or visit the Dos website. We process your data in accordance with data protection law, including the UK GDPR.

Who we are

The controller responsible for processing your personal data is:

Dos
Email: eliastestdev@gmail.com

What data we collect

Dos has no servers of its own and no user account. Your test results, study statistics and settings are stored locally on your device and are not sent to us.

Analytics on how the app is used

  • Usage data — we use the analytics tool PostHog to understand how the app is used, so that we can improve it and fix errors. This is information about how the app is used, for example which parts of the app are opened, along with technical information such as app version and device type.

Why we process the data

We process usage data in order to:

  • Understand how the app is used and improve content and features (lawful basis: legitimate interests).
  • Find and fix errors in the app (lawful basis: legitimate interests).
  • Give you support when you contact us (lawful basis: legitimate interests).

Sharing with third parties

We never sell your personal data. The only third party we use to process data about how the app is used is:

  • PostHog — an analytics tool for understanding how the app is used and fixing errors.

The app is distributed through the Apple App Store, which handles data under Apple's own terms. If PostHog processes data outside the UK and the EEA, this is done with appropriate safeguards under data protection law.

Storage and deletion

Data stored locally in the app stays on your device until you delete the app or its data. Usage data held by PostHog is kept no longer than is needed for analysis and improving the app. If you would like data that can be linked to you to be deleted, contact us and we will help you.

Your rights

Under the UK GDPR you have the right to:

  • Access the personal data we hold about you.
  • Have inaccurate data corrected.
  • Ask for your data to be erased.
  • Ask for processing to be restricted.
  • Receive your data in a structured format (data portability).
  • Object to processing that is based on legitimate interests.

To exercise any of these rights, contact us at eliastestdev@gmail.com. You also have the right to complain to the Information Commissioner's Office (ICO) if you believe we are processing your data unlawfully.

Cookies on the website

The Dos website does not use third-party cookies for tracking or marketing. The site loads fonts from Google Fonts, which means your device's IP address is sent to Google when the page is displayed.

Children's privacy

Dos is aimed at students in healthcare education and is not intended for children. We do not knowingly collect data from children under 16.

Changes to this policy

We may update this policy from time to time, for example if the app's features change. The date at the top of the page shows when the policy was last updated. For major changes we will let you know in the app.

Contact

Do you have questions about this policy or how we handle your data? Get in touch at eliastestdev@gmail.com.