The UsePhysics app has no accounts, no sign-in, no analytics and no advertising. Every formula, constant and explanation is bundled into the app, so it works offline.
The one thing the app sends: an update check
When you open the app it asks Expo’s update service (u.expo.dev, run by 650 Industries, Inc.) whether a newer version of the app’s code is available, so fixes reach you without a store download. That request carries the app’s project id, its version, your platform (Android or iOS) and a random identifier created for this installation (the “EAS client ID”). The identifier is not derived from your device, your account or any hardware id; it changes if you reinstall the app or clear its data. Expo uses it to deliver updates and count how many installations received them. It is not used for advertising or tracking, and we never combine it with anything else. Expo’s own policy: expo.dev/privacy.
What stays on your device
Your recent formulas, your units choice (Metric or Metric + US, and any unit you pick inside a formula) and your colour scheme are saved in the app’s own storage on your phone. None of it is transmitted, and all of it is erased when you uninstall the app or clear its data.
What we never receive
No name, email, location, contacts, advertising ID, hardware identifier, crash report or usage event reaches us or any third party.
Children
The app is a general-audience study tool and is not directed at children under 13. It collects no children’s data.
Changes and contact
If a future version ever sends anything else, this page changes before that version ships. Questions: hello@jukkablomberg.com, or see app support. Published by UsePhysics (usephysics.com), Helsinki, Finland. Last updated 5 November 2026.