v0.1.1GPL-3.0Windows

We build software for the Windows desktop, in the open.

Helm, Quartz and Mantle: three programs made to work together. Open source under GPL‑3.0, every line on GitHub.

Get them

Three programs for one desktop.

Mantle redraws the Windows 11 shell. Quartz is a browser where everything is a tab. Helm runs your Claude Code sessions in a real window.

Each one works on its own. Use one, two or all three.

One Windows 11 desktop: Mantle’s bar and desktop, a Quartz window, and Helm on top. Helm and Quartz: screenshots with sample data. Mantle: redrawn from its code.

Shows this part of the screenshot.

HelmFor Claude Code · desktop app and phone page

Helm: Your Claude Code sessions in a real window.

Helm keeps the Claude Code you installed and replaces the terminal screen with a sidebar of every session, a conversation you can read, and panels for agents, changes and usage.

Point at a to see itTap a to see it

  • The same UI on your phone. A phone page over Tailscale, paired with a QR code.
Helm’s window: a sidebar of projects and sessions marked working, waiting or error, and four sessions side by side, one asking permission to write a file.
Sample data, not a real session.

Helm doesn’t reimplement Claude. Every session is the real Claude Code CLI that you install yourself; Helm only replaces the terminal screen.

Windows 10 and 11, x64 · needs your own Claude Code, signed in

Source on GitHub

QuartzBrowser · built on Electron

Quartz: A browser where pages, terminals and apps are all tabs.

A Windows desktop browser where web pages, Claude Code sessions, terminals, native Windows apps and your Android phone all live as tabs.

Point at a to see itTap a to see it

Quartz’s window: a tab strip with a workspace chip, web and terminal tabs, the blocker’s shield in the toolbar, and a web page split beside a terminal.
A web page split beside a terminal tab.

Also: Reader mode, per-site styles and scripts, light and dark themes, and a new tab page where every piece can be hidden or moved.

Windows 11, x64 · Claude tabs need Claude Code

Source on GitHub

MantleShell layer · Windows 11

Mantle: A new shell for Windows 11, laid over the old one.

Its own bar, launcher, desktop, notifications and system pop-ups, drawn in Electron, with Explorer still running underneath.

Point at a to see itTap a to see it

  • Its own windows. A launcher on Alt+Space, notifications, a Task Manager, Files, Settings, clipboard history, snap layouts and an Alt+Tab switcher.
  • Windows comes back. Ctrl+Alt+Shift+Backspace, the tray menu or a standalone restore script puts Windows back as it was. The original shell state is saved to a file before anything changes.
Redrawn from Mantle’s own code with sample data; not a screenshot.

Mantle changes how Windows draws its shell, and it runs at your own risk. It has been built and tested on one Windows 11 PC.

Windows 11 only

Source on GitHub

How the three fit together.

Each one works on its own. On one desktop, they share a wallpaper and a theme, and pass status and links between them.

There’s no bundle, shared account or suite installer. Each program installs and runs by itself.

  1. One look.

    One shared file holds the theme, accent and glass. Mantle adds its wallpaper; Helm and Quartz pick it up, so all three show the same photo.

  2. Waiting chats.

    Helm counts the chats waiting on you or stopped on an error. Mantle’s bar shows that number on Helm’s icon.

  3. Links.

    A link opened from Mantle goes to your default browser, and Quartz can be that browser: its first-run setup asks.

Early software, said plainly.

All three are free software under GPL‑3.0, at version 0.1.1.

They are Windows only, and each has been built and tested on one machine. That’s early software, and the table says so.

Issues are welcome on each repository. Pull requests aren’t accepted right now.

The state of each program: version, licence, Windows versions, how widely tested, and lines of code counted on 2026-10-31
HelmQuartzMantle
Version0.1.10.1.10.1.1
LicenceGPL-3.0GPL-3.0GPL-3.0
Windows10 and 11, x6411, x6411
Tested onone machineone machineone machine
Lines of code74,577182,327307,007
Of them tests21,09740,53894,532

Non-blank lines of tracked source on each public master, minus vendored, docs, minified and generated files. Tests: test/ folders and test-named files. Counted .

Built in the open.

All three live in public repositories on GitHub. Here is the tip of each master branch when this page was built.

Owen-Silva on GitHub

Last commit on master

Download one, or read every line first.

Each has a per-user Windows installer with no admin prompt. It isn’t code-signed yet, so Windows SmartScreen warns you once: choose More info, then Run anyway. Or build it from the folder you clone.

  • Helm

    Your Claude Code sessions in a real window.

    Windows 10 and 11, x64 · v0.1.1 · Helm-Setup.exe, 109.2 MB

    Needs your own Claude Code, signed in. Setup steps

    Download Source
    git clone …/helm

  • Quartz

    A browser where pages, terminals and apps are all tabs.

    Windows 11, x64 · v0.1.1 · Quartz-Setup.exe, 131.9 MB

    Built and tested on one Windows 11 machine. Setup steps

    Download Source
    git clone …/quartz

  • Mantle

    A shell layer for Windows 11, with a floating island bar.

    Windows 11 · v0.1.1 · Mantle-Setup.exe, 139.6 MB

    At your own risk: built and tested on one Windows 11 machine. Setup steps

    Download Source
    git clone …/mantle