kybern
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Every agent.One harness.

Claude Code, Codex, Cursor and more, side by side in one native app.

Download KybernStar on GitHub
Kybern home: the project sidebar, spaces on the rail, and a composer under “Let’s work in kybern-website”
Claude CodeCodexOpenCodepiOh My PiCursor

No Electron.No Tauri.

Built on Zed’s GPUI. Your GPU draws the interface, not a browser engine, so it stays light through long agent runs.

LayerTauri appKybern GPUIX
Runs inA system web viewBun, no browser engine
Layout & paintDOM and CSSGPUI, the framework behind Zed
Draws withThe web view’s compositorMetal, Direct3D 11 or Vulkan

60%

less memory than the Tauri app

20–40%

less CPU while scrolling

0

frames drawn while idle

300 MB

memory in a long agent session

Agents that hand work to each other.

Ask Claude to have Codex build it and Cursor review it. Each helper opens as its own thread on its own harness, so you can watch any of them work. For bigger projects, a Coordinator plans the work, hands it out and reviews what comes back.

A Kybern thread that delegated three agents on three different harnesses, with a table of what each one is doing

Answers you can click.

An agent can reply with a live page instead of a wall of text: an architecture map, a comparison, a set of options. It sits in the chat as a picture and comes alive when you click it. Pick an option, press Send, and the agent carries on from your answer.

An interactive diagram in a Kybern chat mapping the clients, the kybernd daemon and six agent harnesses, with a live event stream

The rest of the job, in the same window.

  1. Split threads

    Run two agents next to each other, each with its own model. Split up to four groups, each with its own tabs.

    Two Kybern threads side by side, one on Claude Sonnet and one on Claude Opus

  2. Files & editor

    Open any file as a tab and edit it in place, with syntax colours, find and save. The explorer stays docked beside it.

    A file open in a Kybern tab next to the chat tab, with the file explorer docked on the right

  3. Notes

    Project notes that agents read and keep current, filed as preferences, decisions, conventions and gotchas, with stale ones flagged.

    Kybern Notes: pinned project notes and recent notes, filtered by project

  4. Tasks

    A board for each project. Send a task, or a whole batch, to an agent and see it move from running to review to done.

    Kybern Tasks as a board with Inbox, To do, Running, Needs review and Done columns

Details.

The Kybern rail with three space tiles and an add button

Spaces

Group projects with their own icon and colour. ⌃1 to ⌃9 switches.

A Codex usage popover: 95% of the weekly limit left, resets 2 November

Plan usage

See what’s left of each plan and when it resets.

The Kybern environment menu with changes, branch, commit and push, create pull request and editor view

Changes to pull request

Changes, commit, push and pull request in one menu.

  • Rewind

    Undo a turn’s edits, or roll the conversation back.

  • Resume sessions

    Pick up a session from the agent’s own CLI.

  • Private cards

    Sign-ins and API keys never land in the chat.

  • Several repositories

  • Worktrees

  • Steer mid-turn

    Send a follow-up while the agent is still working.

  • Notifications

  • Point, don’t describe

    Click an element in a preview to show the agent.

  • Glass

    Translucent windows on macOS, Mica on Windows 11.

Read the guide

Nothing leaves the machine.

The whole harness, in your pocket.

Pair with a QR code. Android is in preview; iOS is a development build.

Download Android APKv0.1.2 · build 9 · preview
Kybern mobile on two phones and a tablet: the home screen, a thread list beside a finished thread, and a thread in progress

Any machine becomes the workstation.

The Kybern environment picker: This Mac connected, a server over SSH, and Pair a device

Open and work.

The app bundles its daemon. Nothing to install twice.

Any server, over SSH.

Enter user@host and Kybern installs its daemon there and connects through a tunnel it manages. Or run the installer yourself; --service keeps it under systemd.

curl -LsSf …/kybern-remote-install.sh | sh

Pair inside the tailnet.

Listen on the machine's Tailscale address and scan the QR. Traffic stays inside the WireGuard tunnel.

Get Kybern.

$ curl -fsSL https://kybern.treshnanda.tech/install.sh | sh

The app isn’t notarized, so installing from the command avoids the Gatekeeper prompt a browser download triggers.

All releases