I always have multiple apps in my mac open. Even if I use spaces or full screen apps...well, it gets cluttered eventually. So I built a lightweight swift app which blurs everything except the active window. I call it Muffle.

Now I use Muffle to hide the background while I'm in a meeting, reduce cognitive load and also because it's nice to focus on one window while everything else is blurred.

There are several apps like HazeOver (dims the background but no blur) and Monocle (beautifully designed app but recently is causing background performance issues) which does what Muffle does but I wanted to build an app which applies background blur and applies a dim, without taking a toll on CPU or GPU.

Key Features

• Shake to Toggle: Instantly blur or unblur everything except the active window by shaking your cursor.

• Blur & Dim Controls: Customize the blur intensity and window dim to suit your preferences.

• Blacklist apps: Automatically disable blur and dim on blacklisted applications

• Optimized for Performance: Built with native Swift, Muffle ensures negligible overhead with ~0% CPU usage at idle.

• Versatile Use Cases: Ideal for deep work, ADHD-friendly workspaces, privacy during screen sharing, and reducing cognitive load.