Point and create.

There’s a new IDE in your future — one that finally keeps up with you. Mark up anything you see. Your agents build it while you keep moving. Shellcaster puts your agents, browser, and editor in one place. Bring your team to the party with live E2E encrypted sharing.

Finally, an IDE that can keep up with you.
Mark up anything — agents build it as you go.
Agents, browser, editor, all in one place.

Download for macOSGet for MacIn Beta · Forever FreeForever Free

Learn more ↓Demo and details belowDemo below

Your intent is the new code.

AI turns specs, design docs, and other artifacts into code, just like compilers turn code into assembly. Artifacts should be durable, just like your codebase.

Spec

Autosave

• Save after typing pauses

• Never lose a draft

• Sync when back online

Agents

Code

void autosave(Doc *doc) {

if (!doc->dirty)

return;

write_draft(doc);

queue_sync(doc->id);

mark_clean(doc);

Compiler

Assembly

So why not build an IDE for pro software engineers
centered around durable artifacts and agents?

Capture intent everywhere.

Annotate markdown, HTML, and even live sites. Agents do the work.

Meet Shellcaster.

A professional IDE where markdown, HTML, and your live site are integrated
with your codebase and your agents — all in a single window.

Your new daily driver.

Everyone’s talking about harnesses. So where does Shellcaster fit? We’re the magic carriage you and your team ride in — use it with your favorite harnesses and models.

summoning…

For all your agents.

Bring the CLI you already trust, and try new ones without changing your workflow.

Claude CodeAnthropic

CodexOpenAI

Gemini CLIGoogle

CursorSpaceX

OpenCodeopen source

And your team too.

Everyone who shapes the product can weigh in. Share docs, in-progress sites, diffs, and get live feedback that you can delegate to AI with a button pressa click.

You

Principal engineer

Product manager

Leadership

Designer

Fellow engineer

A product is a thousand conversations.

With your team, users, and now your agents too. In Shellcaster, conversation happens alongside your live site and specs. Agents can act on feedback right away.
Agents bring that feedback to life.

Accelerate the feedback loop.

Agents bring speed. Your team brings taste and expert judgement. They watch the work take shape and leave feedback right on the page. You delegate the changes.

summoning…

End-to-end encryption

Your ideas are worth protecting.

Not even the friendly wizards at Shellcaster can get in. Which means competitors and bad actors can’t either.

Read the security whitepaper →

summoning…

Speed comes from reducing friction.

Ship faster with Shellcaster. We’ve obsessed over every interaction to craft an experience designed to save you time. The delta is in the details:

Fly by keyboardChords for every view, pane, and mode. Navigation that feels effortless.

Speak it into beingFast local voice models, for live transcription that works everywhere.

Never lose an agentShell charms identify the agents you’re looking for. Restore past sessions anytime.

Make it yoursBeautiful, curated themes — mix them across shell, editor, and worktrees.

Commits write themselvesAnalyzes agent transcripts and diffs, to write messages featuring what, how, why.

Git worktreesoptionalDedicated workspaces per worktree help you track what your agents are changing.

Tools matter.

They raise the ceiling on what we can create.
See how we compare.

	Shellcaster	Cursor Classic
Annotations	Persistent pins, Slack-style threads	None
Conversations per agent	Multiple conversation threads	Only one
Comment on anything	Live sites, design docs, diffs,	Chat window, code editor
Design docs	Markdown, Mermaid, HTML built in	Extensions required
Agents supported	Claude Code, Codex, Gemini,	Cursor Composer only
Where’s the agent?	On your Mac, in your repo	Local, in the editor
Full IDE	Yes. Edit code, Markdown, Mermaid	Yes. VS Code fork
Extensions	Extensions coming soon	VS Code extensions
Price	Free for your Mac. Pay to share	Monthly, plus usage credits
Can edit	Code and Markdown, plus agent edits	Any file, like an editor
Git integration	Parallel worktrees, auto commit and PR messages	Git panel, inline diffs
Built-in terminals	Many — a multi-agent orchestrator	An editor panel
Agent history and resume	Resume any agent, with scrollback	Chat history in the app
Live site preview	Built-in browser, annotate the page	Through extensions
Voice	Point anywhere and talk	Through extensions
Mobile preview	Your site at phone size	Through extensions
Platforms	Native Mac app. Designed for Mac	VS Code fork. Cross-platform Electron app

Comparing Shellcaster with Cursor Classic.

Help shape the future.

Shellcaster is in beta — and the people building with it now are shaping what it becomes. Try it today. We’d love to hear what you think.

Download for macOSGet for Mac Pricing