Turn Off Screen Pro

Turn Off Screen Pro is a small Android utility: tap the icon and the screen locks. No menus, no waiting.
Features
• One-tap lock from a home-screen icon.
• Two modes, switchable in Settings:
• Normal: standard Device Admin lock. The next unlock asks for PIN, password or biometric.
• Use with fingerprint: locks via Accessibility, behaving like a physical power-button press, so the fingerprint sensor still unlocks the device on the next wake.
• Localised into 20 languages.
• Tiny install size, under 1 MB. No ads, no in-app purchases, no account, no analytics, no third-party trackers.
Why this app Many Android phones temporarily disable fingerprint unlock after a Device Admin lock. If you lock the screen often, that means typing your PIN over and over. The "Use with fingerprint" mode triggers the same kind of lock the power button does, so fingerprint unlock keeps working.
Setup The first launch asks for Device Admin permission. The app uses it only to lock the screen. For fingerprint mode, open Settings, choose "Working with fingerprint", then enable Turn Off Screen Pro under Settings - Accessibility. A clear in-app screen explains the permission before you grant it.
Permissions Device Administrator (required) to lock the screen. Accessibility (optional, only for fingerprint mode) to trigger the system lock action. The app does not read screen content, does not collect personal data, and transmits no data.
Uninstalling Settings - Security - Device admin apps - uncheck Turn Off Screen Pro, then uninstall normally.