Privacy policy: Hardware

Last updated: 26 September 2026

Hardware ("How hardware actually works") is an offline, interactive course on how computers work, from electrons up to LLM inference. This policy covers the Android app and the web version.

What the app stores

The app keeps a small amount of learning progress on your device, in the app's local storage:

• which lessons you have opened and which lesson goals you have ticked off
• your answers to "predict first" questions (right or wrong)
• which tier checkpoints you have passed
• your progress on the "follow one load" trace

This data never leaves your device. You can clear it at any time with the reset buttons in the app, or by clearing the app's storage or uninstalling it.

What leaves your device

Nothing. The app has no accounts, no servers, no analytics, no crash reporting, no advertising and no third-party SDKs that collect data. All lessons and simulations run locally. The app does not request access to your contacts, location, camera, microphone or files.

Children

The app does not knowingly collect any personal information from anyone, including children.

Changes

If this policy changes, the updated version will be published at the same place with a new date.

Contact

Oli Holder, olivermholder@gmail.com