4kus

4kus is a smart productivity app that helps you reduce mindless scrolling and regain control of your screen time. Instead of instantly opening distracting apps, 4kus challenges you to earn access through a quick quiz or a simple exercise.

Whether you're trying to study, work, exercise, or simply spend less time on social media, 4kus helps you make intentional decisions before every distraction.

How 4kus uses the AccessibilityService API

4kus uses Android's AccessibilityService API to power its core app-blocking feature: the service detects when you open an app you have chosen to block, so 4kus can immediately show the unlock challenge before you start scrolling.

Your privacy is protected:
• The service only observes which app is in the foreground — it cannot and does not read your screen content, messages, passwords, or payment information (window content retrieval is disabled).
• No data from the service is collected, stored remotely, or shared with anyone.
• The service is optional and only activated if you enable it yourself in Android Settings, after 4kus explains why it's needed.
• You can disable the service or uninstall 4kus at any time.