fifku is an educational learning game for children ages 5–15. It contains only age-appropriate learning content — math, reading, spelling, and cursive practice — with no violence, no mature themes, and no objectionable material.

The app has no advertising, no in-app purchases, and no third-party tracking or analytics. It requires no account, email, or personal information: a child simply picks a fun, auto-generated player name (never their real name) and plays. There are no chat, messaging, or other communication features, and no free-text user-generated content.

An optional global leaderboard displays only an anonymous player name, avatar, and score, and can be turned off at any time. All progress is stored on the device and backs up privately to the user's own iCloud. The app is suitable for young children and appropriate for all ages.