A desktop shell that gets out of the way.

Sysnul is a Windows app built around its own chrome: a title bar you control, tabs that dock to any edge, notifications that stay quiet when you ask, and a window that can go frosted or clear without turning the text to mud.

Download Sysnul Get a free day key

What it does

Its own window

Custom title bar, corner radius you set, drag from anywhere, and a frosted-glass mode that blurs what is actually behind it rather than tinting the wallpaper.

Tabs anywhere

The tab bar docks to any of the four edges, with sub-tabs nested inline, given their own bar, or floated as an island over the page.

Quiet by default

Do not disturb, quiet hours that follow your clock format, a chime you choose, and seventy-odd settings that all remember themselves.

Getting started

Download the build. One folder, no installer.
Claim a free day key. One per person per day, no account needed.
Paste it into Sysnul. It runs until the key runs out.

Questions, bugs, or a key that has stopped working — the Discord is the fastest way to reach me.