Muffle 1.3 for Mac

Mac Utilities

Updated Aug 22, 2026

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Muffle is a small focus app for Mac with a simple idea: everything except your active window gently blurs and dims, so the window you are working in is the only thing asking for your attention. Chat windows, mail and other clutter fade into the background while you write, read, code or sit on a video call. You control how strong the effect feels. Updated Aug 22, 2026.

Key Features

• Blurs every window except the active one
• Separate controls for blur strength and dim level
• Keeps the focused window sharp and clear at all times
• Helpful during calls for a calmer shared screen
• Native Swift build with very low overhead
• Simple controls that stay out of your way

How to Download

1. Download from the official site and read about how Muffle works.
2. Download the Mac app from the developer site.
3. Install it and grant the permissions macOS asks for.
4. Set your blur and dim levels and get back to work.

System Requirements

Muffle runs on Macs with a recent macOS release. Because it works with your windows on screen, macOS will ask for accessibility permission during setup, which the app needs to know which window is active.

FAQs

Does Muffle close or hide my other apps?

No. Your apps stay open and untouched. They are only blurred and dimmed visually until you switch back to them.

Can I adjust how strong the blur is?

Yes. Blur and dim each have their own control, so you can keep the effect subtle or make it very strong.