Contact
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The quickest way to reach us is email: [email protected]. We read every message and usually answer within a few working days.
On this page
What to include
- A mistake in a lesson or question: the page address (or the lesson and question number in the app) and what looks wrong.
- A purchase in the app: the Google Play order number (it starts with GPA.). Refunds themselves are handled by Google Play.
- Privacy requests: what you would like us to do. See also App data and deletion.
Permission to use content
To ask for permission to use our material beyond personal study (see the terms of use), describe how you would like to use it.