Grayscale Filter

Grayscale Filter turns your screen black and white when you open a chosen app. Color is one of the main reasons apps feel exciting and hard to put down , removing it makes them feel dull in a helpful way.

Note

Grayscale Filter requires a free helper app called Shizuku. You need to set up Shizuku before this feature will work.

Setting Up Shizuku

The Shizuku Permission Required card appears until you complete the setup below.

Shizuku is a free Android app that gives Curbox the special permission needed to apply the grayscale effect.

1. Install Shizuku Download Shizuku from the Play Store or from its GitHub releases page.

2. Activate Shizuku Open Shizuku and follow its setup instructions. If you are on Android 11 or higher, you can activate it using Wireless Debugging — no computer needed.

3. Grant permission to Curbox Open Curbox, tap Reducers, then tap Grayscale Filter. You will see a Shizuku Permission Required card. Tap Grant Permission and approve the popup.

Creating a Grayscale Group

Once Shizuku permission is granted, you can set up your groups.

1. Tap the + button The + button is in the bottom right corner of the Grayscale Filter Setup screen.

2. Name your group Type a name like “TikTok” or “Social Apps.”

3. Select apps Choose the apps that should switch to grayscale when opened.

4. Save Tap Done. The filter is active for those apps immediately.