Video
Formula
Field
Formula
Command
Audio
Card Instance
Theme
Query
Boxel Credit
Query
Boxel Credit
BFM Document
Boxel Credit
Procedural 3D
Data Import
Font
Published Site
Card Instance
Canvas
Audio
Wiki
Flow
Theme
Data Import
Wiki
Card Definition
Wiki
Canvas
Agent Session
Listing
Font
BFM Document
Vector
Hosting Config
Listing
Formula
Procedural 3D
Skill
Card Instance
Vector
Audio
Query
Hosting Config
Agent Session
Formats
Theme
Issue
Font
Card Instance
HTML Prototype
Data Import
Audio
Table
Wiki
Skill
Hosting Config
Query
Table
Published Site
Table
Card Definition
Formula
Agent Session
Field
Data Import
HTML Prototype
Issue
Flow
Audio
Wiki
Table
Data Import
Published Site
Query
Card Instance
Agent Session
HTML Prototype
Wiki
Vector
Canvas
Font
Query
Published Site
Query
Formats
Boxel Credit
Vector
Data Import
Query
Font
Theme
Video
HTML Prototype
Formula
BFM Document
Wiki
Table
Theme
Vector
Field
Vector
3D Model
HTML Prototype
Field
Card Instance
Flow
Video
Formats
Procedural 3D
Query
Theme
Flow
Formula
Theme
Published Site
Wiki
Issue
Listing
Card Instance
Issue
Font
Field
Font
Formula
3D Model
Font
Hosting Config
Query
Listing
Flow
Formats
Published Site
Table
Procedural 3D
BFM Document
Flow
Wiki
Card Definition
Boxel Credit
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BFM Document
HTML Prototype
Published Site
Agent Session
Audio
Data Import
Agent Session
Boxel Credit
Published Site
HTML Prototype
Hosting Config
Listing
Font
Field
3D Model
Procedural 3D
Agent Session
Canvas
BFM Document
Skill
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Field
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Canvas
Boxel Credit
Hosting Config
BFM Document
Card Instance
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Theme
Agent Session
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Formula
Wiki
Card Definition
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Query
HTML Prototype
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Published Site
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Listing
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Formula
Vector
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Card Definition
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BFM Document
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Boxel Credit
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Formats
Wiki
Hosting Config
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Hosting Config
Agent Session
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3D Model
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Card Instance
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Card Definition
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Boxel Credit
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Card Instance
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Theme
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Skill
Audio
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Procedural 3D
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Card Definition

Build software with AI. Then actually use it.

Boxel is the collaboration space where you and your agent make working apps, documents, and tools — with real data, reusable code, and instant feedback.

Start Using View on GitHub
100% Open Source MIT License Remixable Bring Claude Code or Codex
AI Workspace

Give your agent a workspace, not just a chat window.

Chat forgets. A workspace accumulates — files, data, skills, and working software that both of you can see. And because code and data live side by side, the code you deposit upgrades what the workspace itself can do.

  1. STORE Documents and files

    14 files written — Word docs and PDFs, indexed and searchable.

  2. CODE Deposit code

    Ported to cards — source is in the workspace and the preview is live.

  3. DATA Import data

    812 rows became cards — faceted search is wired up.

  4. SKILLS Write skills

    Updated press-release.md — the skill now enforces one-sentence ledes.

  5. WORKSPACES Compartmentalize projects

    Found it in halden-legal — opening the card.

  6. AGENT Everything you’ve made

    Found PricingTable in nomad-coffee — linked into this project.

  7. CLOUD In the cloud

    In your realm on boxel.ai — synced, indexed, and backed up.

  8. SHARE Host and remix

    Live in host mode — visitors get the app, plus a Remix button.

Boxel — Documents and files
Documents and files
Boxel — Deposit code
Deposit code
Boxel — Import data
Import data
Boxel — Write skills
Write skills
Boxel — Compartmentalize projects
Compartmentalize projects
Boxel — Everything you’ve made
Everything you’ve made
Boxel — In the cloud
In the cloud
Boxel — Host and remix
Host and remix
Agent CLI

Use Boxel with the agent you already pay for, trust, and know.

Your agent interacts with the workspace through a full-featured CLI. You ask in plain English — it writes the boxel commands. Already pay for Claude Code or Codex? The open-source Boxel CLI connects them straight to your workspaces.

Works with
Claude Code Claude Code
OpenAI Codex OpenAI Codex

Quickstart — copy one prompt into your agent

Set up Boxel for me: install the CLI with `npm install -g @cardstack/boxel-cli`, connect my account with `boxel profile add` (Production, app.boxel.ai), and add the Boxel skills with `/plugin marketplace add cardstack/boxel` then `/plugin install boxel-cli`. Verify by running `boxel realm list` and show me my workspaces.

Paste it into Claude Code or Codex — your agent runs the install, connects your account, and confirms.

View on GitHub — MIT licensed, open source
claude — ~/halden-shop

All Commands

realm create Spin up a new workspace
realm pull Download a workspace to your machine
realm push Upload local changes to Boxel
realm sync Bidirectional sync with conflict resolution
realm watch Pull server-side changes in real-time
realm history Checkpoints, undo, and restore
realm publish Publish a live, public copy — host mode
realm ingest-card Copy a card and its deps from any realm
file read / write Read and write individual realm files
lint Lint a whole workspace, or one file
parse Type-check cards before you push
test Run card test suites headlessly
search Federated search across workspaces
run-command Run a host command from the CLI
realm list Browse your workspaces
profile Manage accounts and environments
AI-Native Stack

Legacy stacks weren't built for AI.

Built on Cardstack

AI excels at reading and writing files. So we built an architecture where one file type defines your entire application—schema, templates, relationships, and commands.

  • Two file types: JSON for data, TypeScript for logic
  • AI-native formats: Both are in every LLM's training corpus
  • One file, all layers: Schema, UI, and logic live together
Architecture

One file. Full stack.

Five traditional layers—frontend, backend, API, database, orchestration—compressed into TypeScript + JSON.

Gallery image 1
Memory

Workspace memory that persists.

In other tools, chat IS your project. Lose the chat, lose the work. Boxel inverts this: the workspace remembers, sessions are disposable helpers you summon and discard.

Gallery image 1
Database

The database that builds itself.

Data is just JSON. AI outputs JSON, we index it automatically into a queryable database. No Supabase, no migrations, no SQL.

Gallery image 1
Context

AI that understands your app.

Current AI tools are "brains in a jar"—floating outside your actual data. Boxel's assistant reads your schema, inspects your Cards, and accesses code when needed.

Gallery image 1

What will you build?

The transition from human-written to AI-generated software will be one of the most significant shifts in technology history. The constraint isn't architecture anymore. It's imagination.

Explore

Open a workspace and ask the AI to build something.

Remix

Browse the catalog for components that match your needs.

Extend

Hit a limitation? Switch to Code Mode and fix it.

Contribute

Build a skill, publish a template, share what you've learned.

Start Using Read the White Paper