This screen filter will let you cover most of your screen except a small cutout.
You can move and resize the mask so you yourself can still see everything.
The rectangle is as wide as the screen so it's perfect for texting. The small circle is ideal for even more secret things.

Protect your privacy from:
🔒 Strangers on the bus train subway or plane
🔒 Nosy friends and family
🔒 Strict bosses and colleagues
🔒 Shoulder surfing and other social engineering techniques

Useful for:
🛡️ Hiding "not safe for work" (NSFW) content.
🛡️ Logging in securely with your PINs passwords or passcodes.
🛡️ Dimming the screen even further than normally possible.

This screen guard can hide your confidential data from strangers looking over your shoulder.
It hides the background with a shade to keep your sensitive content private from observers. It works with WhatsApp Telegram Signal or any other chatting app.

It's very simple to use:
The screen filter will stay active even when you close the app.
Drag the red dot to move the hole. Double tap it to make it bigger.
You can also change the opacity and shape.
The overlay can also be started from the home screen with a shortcut. Or even from the quick settings tile (be aware not all devices support quick settings tiles properly).

No additional downloads and no service that runs all the time! ;-)