02 · Open source · v0.4.0 · Apache-2.0 · macOS / Windows / Linux

Six agents. One window.

SeaShell is a terminal for running several Claude Code sessions at once. Panes tile in one window, a file explorer sits beside them, and a card catches whichever session has stopped to ask you something.

DOWNLOAD → SOURCE ON GITHUB

SeaShell running six Claude Code sessions tiled in one window, with the file explorer and waiting-session card

Themes

Dress it how you like it.

Ships with switchable themes, from a quiet macOS light to full retro CRT.

SeaShell in the Nautical theme, deep teal panes

Nauticaldefault

macOS Lightfor daylight

SeaShell in the Hacker theme, green on black

Hackergreen on black

SeaShell in the Retro CRT theme, amber phosphor glow

Retro CRTphosphor glow

Claude Code skills · 14 published · free TIP ON KO-FI

$ /plugin marketplace add voidharbor/claude-plugins

$ /plugin install voidharbor@voidharbor

+ 14 skills registered

Small skills written for my own work, published as a plugin marketplace. They flag waiting sessions, close an agent's leftover browser tabs, and audit what Claude has remembered about you.

c-assistant chrome-tabs efmtu mac-control memory-curate perf-pass product-forge skill-forge synth-mode + 5 more

thermal-widget

A menu bar widget that shows when your Mac is throttling itself.

REPO →

FAQ

Frequently asked questions.

What is SeaShell?

SeaShell is a free, open source terminal for running several Claude Code sessions at once. Panes tile in one window, a file explorer sits beside them, and a card catches whichever session has stopped to ask you something.

Who is SeaShell for?

People who run more than one Claude Code session at a time. Sessions tile as panes in one window instead of sitting in separate windows, and the waiting-session card shows which one has stopped to ask you something.

What does SeaShell cost?

Nothing. SeaShell is free and open source under the Apache-2.0 license, and the source is on GitHub.

How do I get SeaShell?

Download the latest release from GitHub. The current version is v0.4.0 and it runs on macOS, Windows, and Linux.

Does SeaShell have themes?

Yes. It ships with switchable themes, from a quiet macOS light to full retro CRT. Nautical is the default, with macOS Light, Hacker, and Retro CRT alongside it.