Your design system, ready for agents.

A shadcn-compatible React registry with reproducible themes, verified install plans and tools that keep customized interfaces maintainable — for you and the coding agents you work with. Open source; the code belongs to your project.

Use with an agent Browse components Build a theme

Public beta: logic2b@next and @logic2b/mcp@next, registry 1.0.0-rc.18. Compatibility table

Reproducible today, maintainable tomorrow

Three steps, each backed by a command the release gate actually runs.

Step 1
Install from a versioned registry
Every item resolves to one immutable release and is SHA-256 verified before it is written. The exact version and integrity are recorded in the project so the inputs can be reproduced later.
```
npx logic2b@next init --template vite --starter marketing
npx logic2b@next add button card --registry-version 1.0.0-rc.18
```
Installation guide →
Step 2
Connect your coding agent
The same tools run locally over stdio or remotely at /mcp. They return plans and verified sources; the host writes files, installs dependencies and runs the build.
```
{ "mcpServers": { "logic2b": { "url": "https://ui.logic2b.com/mcp" } } }
# or locally: npx -y @logic2b/mcp@next
```
MCP setup for humans →
Step 3
Change it without losing your work
Updates merge three ways against the snapshot taken at install time, so local edits survive. Theme drift against an exact preset is detected statically and corrected in place.
```
npx logic2b@next update --registry-version "^1.0.0"
pnpm --filter @logic2b/mcp demo:walkthrough  # preset → scaffold → edit → lint_theme → fix
```
Theming and presets →

A complete interface, not a widget wall

The starters below are the exact block compositions the CLI and MCP emit. Open one, then generate its editable source with the command shown. Mobile, loading, empty and failure states for the reference customer-management journey are the next milestone, not a promise on this page.

All live demos

Marketing site
A complete launch page with navigation, animated hero, feature grid, call to action and footer.
```
pnpm dlx logic2b@next init --cwd logic2b-marketing --template vite --starter marketing --name logic2b-marketing
```
Open the live marketing starter →
Analytics dashboard
An application shell with KPI cards and production-ready charts.
```
pnpm dlx logic2b@next init --cwd logic2b-dashboard --template vite --starter dashboard --name logic2b-dashboard
```
Open the live dashboard starter →
Authentication
A centered sign-in experience ready to wire to any backend.
```
pnpm dlx logic2b@next init --cwd logic2b-auth --template vite --starter auth --name logic2b-auth
```
Open the live auth starter →

What ships today, what is planned

Shipped in the beta

Registry of React 19 + Tailwind v4 components, blocks and charts with immutable version manifests
CLI and MCP install/scaffold plans with exact versions and SHA-256 integrity
Theme and typeset studio, portable token exports (DTCG, Tokens Studio, CSS, iOS, Android)
Three-way updates, theme drift linting and per-item accessibility contracts
Complete marketing, dashboard and authentication starters for Next.js, Vite and Astro

Planned, not installed yet

Project inspection and context collection for existing apps
Incremental change plans with preconditions and conflict handling
Evidence-based UI review and consumer runtime verification
Structured composition and versioned proposal previews
An accessible agent-run kit with approvals, artifacts and recovery

Read the roadmap and evidence rules →

Your design system, ready for agents.

Reproducible today, maintainable tomorrow

Install from a versioned registry

Connect your coding agent

Change it without losing your work

A complete interface, not a widget wall

Marketing site

Analytics dashboard

Authentication

What ships today, what is planned

Shipped in the beta

Planned, not installed yet