Your ideas can’t wait.

There’s a new IDE in your future. Shellcaster brings your agents, browser, and editor into one place. Mark up anything you can see — and your agents build it while you keep moving. Build live with your team, and get the full benefit of their input.

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

Download for macOSGet for MacIn Beta · Forever FreeForever Free

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Specs are the new code.

AI turns specs into code, just like compilers turn code into assembly.

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 specs and agents?

Introducing Shellcaster.

Turn specs into products. An environment 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

Leverage your team’s judgement.Accelerate the feedback loop.

Your team sees your work as it takes shape, feedback lands right on the page, and you delegate the changes to agents. Accelerate the feedback loop.

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.

summoning…

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