All built on one principle: your data stays yours.
Most Misket apps run entirely on device: no account system, no server, no analytics, and the amount of data they collect is zero. The apps that show ads or use a server — Civics Test and Quiz English — are the exception, and each spells out what it does on its own privacy page below.
Some apps use Apple's own services: StoreKit for purchases, Game Center for leaderboards, WeatherKit for weather data and Screen Time for app blocking. Data handled by those services falls under Apple's privacy policy and is never passed to us.