Curtain
View source中文Download for Windows

Made for Windows0.2.0-beta.5.2

Screen privacy,
on your terms.

A little frosted glass for your windows and desktop. Cover what you need, reveal it when you choose, and get on with your day.

Download for WindowsView source

Windows x64 · Beta release · Primarily tested on Windows 11

The Curtain app beside a frosted overlay covering a fictional demo window
Real Curtain interface. Project Nimbus is fictional demonstration content.

A little cover. A little more control.

One window or your whole desktop. You decide what to protect.

01 / Pick a window

That window. The rest stays as it is.

Choose Add window, move your pointer over the window you want, and click when it highlights. Add several windows and control each one independently.

Default shortcutCtrl + Shift + F9
Curtain window selection highlighting the fictional Project Nimbus test window

02 / One-click control

A slim handle. A simple choice.

Click the small handle above a window to cover or reveal it. The overlay and handle follow as you move or resize the window.

A real frosted window overlay with its slim white handle above the frame

03 / Automatic protection

Step away. Let Curtain step in.

Enable idle protection in Settings, choose an inactivity period, and protect either your added windows or every display.

1minute3minutes5minutes10minutes

Off by default. Temporarily reveal a window and it will be covered again at the next idle threshold. Ending automatic protection preserves your previous manual window settings.

Curtain idle-protection settings showing inactivity time and two protection scopes

04 / The whole desktop

Draw the curtain across your desktop.

Start full-screen protection in one action, including across multiple displays. Use the Restore access button at the top, or the default shortcut, to return.

Curtain full-screen frost on a Windows desktop with a Restore access control at the top

Full-screen protection / End automatic protectionCtrl + Shift + F10

See it in action

Pick. Cover. Reveal.

A real window-protection walkthrough. See how Curtain fits into your desktop.

  1. 01Pick the window to protect
  2. 02The frosted overlay appears
  3. 03Click the handle to reveal it

Original-speed loop · Fictional demo content

Part of your day

Small moments. Useful cover.

Keep your desk focused

Temporarily cover a conversation, document, or project notes, leaving what you need in view.

Prepare to share your screen

Cover windows you do not intend to show, then check your shared view before presenting.

When you step away

Choose an idle period that suits your routine, and let automatic protection take over.

Curtain home screen showing Add window and Protect entire screen buttons

Get started

Download. Open. Draw the curtain.

  1. Install the Windows x64 beta

    Get the installer here or from GitHub Releases. It is currently unsigned, so Windows may show an unknown publisher warning.

  2. Add a window or cover your desktop

    Open Curtain and choose Add window or Protect entire screen to begin.

  3. Make it fit your routine

    Choose an idle time and scope in Settings if you want automatic protection. Updates can download in the background; you choose when to install and restart.

Download for Windows

0.2.0-beta.5.2Release notes & alternative download ↗

Verify the download source. Do not disable Windows security protections to install it.

Show installer SHA-256DD8D4CA12832D26AD8B1FE3FEDD70090E27003DE2AD141596E9E562E5FFF3A72

Common questions

A few things to know.

What is Curtain, and when is it useful?

Curtain is a visual privacy overlay for Windows. It puts frosted glass over chosen windows or your desktop, helping you temporarily hide content, prepare for a presentation, or reduce what is immediately visible when you step away.

How do I add a window or reveal it again?

Choose Add window, move your pointer over the target, and click when it highlights. Then click the slim handle above that window to cover or reveal it. The default Ctrl + Shift + F9 shortcut also opens window selection.

How do full-screen and idle protection work?

Choose Protect entire screen for a full-screen overlay. Idle protection is an opt-in setting: choose 1, 3, 5, or 10 minutes and either added windows or all displays. The default Ctrl + Shift + F10 shortcut toggles full-screen protection or ends the active automatic session. Moving the mouse alone will not reveal every window.

Can it replace locking Windows, or stop screenshots?

No. Curtain is a visual overlay, not a Windows sign-in lock or a security boundary. It cannot prevent other software from taking screenshots or recording your screen. Use the Windows lock screen whenever your situation calls for it.

What are the current beta limitations?

Separate top-level interfaces, including some IME candidate windows, may remain visible above the overlay. Blur strength is not adjustable. The list of protected running windows does not return automatically after restarting Curtain. Behavior may vary between applications.

Which Windows versions are supported? What about installation warnings?

The installer is for Windows x64, and the beta has been tested primarily on Windows 11. The project targets Windows 10 version 2004 and later, but Windows 10 runtime compatibility has not been independently tested. The installer is unsigned, so Windows may warn about an unknown publisher. Verify its source and keep security protections enabled.

How do I update Curtain?

Curtain can check for updates and download them in the background, or you can check from the About page. You choose when to install. The current installer is also available here and on GitHub Releases.

Open source

Help make Curtain better.

The app source is available under GPL-3.0-only. Explore the code, share your experience, or contribute to the next improvement.

View sourceReport a bug or suggest an idea
Read the GPL-3.0-only license ↗