Graycie

Graycie automatically switches Android's grayscale color correction according

to the app currently in the foreground.

Choose one of two policies:

• Only selected apps: selected apps are grayscale; everything else stays in color.

• Except selected apps: selected apps stay in color; everything else is grayscale.

Color apps keep your saved correction for color blindness and its on/off state.

If your saved correction is grayscale, color apps turn correction off instead.

Graycie also includes optional auto-snooze support for banking and other

security-sensitive apps that refuse to run while an accessibility service is

enabled. “Open safely” disables Graycie's accessibility service before opening

one of these apps. You remain in control of when the service resumes.

Important setup and privacy details:

• Graycie uses an accessibility service solely to identify the foreground app.

It does not read screen text, inspect window content, perform gestures, or

collect what you type.

• Graycie reads the installed-app catalog so you can select apps for grayscale

and auto-snooze policies.

• A one-time ADB command must grant WRITE_SECURE_SETTINGS. This lets Graycie

control Android's color-correction setting and restore its own accessibility

service after a snooze. The permission cannot be granted from within the app.

• Foreground-app detection, policy decisions, settings, and app lists remain

entirely on your device. Graycie has no network permission, analytics,

account, ads, cloud service, or telemetry.

• An ongoing local notification is shown while accessibility is snoozed so you

can return to Graycie and resume it.