Last updated November 12, 2026.
Sakusaku is made by Yannick Spreen. This page says what the app does with your data.
Your quiz answers, your level and your study progress. They are used to choose what you study next. We do not sell this data and do not use it for advertising.
If the app offers an account or sync, your progress is stored on our servers so it can follow you between devices. You can ask us to delete it at any time.
The app may send anonymous crash and error reports so we can fix bugs. They do not include your name or email.
Sakusaku is not aimed at children under 13 and does not knowingly collect their data.
Delete the app to remove data stored on your phone. To delete anything stored on our side, email sakusaku@spreen.co and we will do it within 30 days.
If this policy changes, the date at the top changes too.