Siza

The open full-stack AI workspace — generate, integrate, ship.

Every AI code tool generates beautiful frontends. Then you spend days wiring auth, database, APIs, and deployment. Siza owns the full-stack integration layer — from idea to production, zero lock-in.

Live: siza-web.uiforge.workers.dev
Dev: siza-web-dev.uiforge.workers.dev

Why Siza

What we are	What we're NOT
Open-source workspace you can self-host	Locked-in SaaS like v0.dev
Full-stack (UI + backend + deploy)	Frontend-only generator
MCP-native (composable AI tools)	Monolithic AI black box
Privacy-first (BYOK, zero telemetry)	Data-harvesting freemium
Generous free tier by default	Free trial with paywall

Features

• AI-Powered Generation — Natural language or screenshot to production-ready UI components
• MCP-Native — 12 UI tools, 7 branding tools, 20+ gateway servers, all composable via Model Context Protocol
• Privacy-First BYOK — Bring Your Own Key with client-side AES-256 encryption
• Generous Free Tier — Cloudflare Workers + Supabase + Gemini free tiers give you a generous starting point at $0/month
• Self-Hostable — Run everything locally with Docker, MIT licensed
• Multi-LLM — Swap between Gemini, Claude, GPT without code changes
• Production Ready — Monaco editor, live preview, Stripe billing, feature flags

Quick Start

git clone https://github.com/Forge-Space/siza.git
cd siza
npm install
supabase start
supabase db push
npm run dev

Open localhost:3000. Supabase Studio at localhost:54323.

Environment Setup

Create apps/web/.env.local:

NEXT_PUBLIC_SUPABASE_URL=http://localhost:54321
NEXT_PUBLIC_SUPABASE_ANON_KEY=your-local-anon-key
NEXT_PUBLIC_ENABLE_BYOK=true
NEXT_PUBLIC_ENABLE_GEMINI_FALLBACK=true

Architecture

forge-patterns (shared standards)
    |
    v
mcp-gateway (AI tool routing) --> siza-mcp (12 UI tools)
    |                              branding-mcp (7 brand tools)
    v
siza (this repo)
├── apps/web      — Next.js 16 frontend (Cloudflare Workers)
├── apps/desktop  — Electron desktop app (local Ollama + MCP)
└── apps/api      — Backend API service

Stack

Layer	Technology
Frontend	Next.js 16 (App Router), React 19, TypeScript 5.7
UI	Tailwind CSS, shadcn/ui, Radix, Monaco Editor
State	Zustand, TanStack Query
Auth/DB	Supabase (PostgreSQL 15, Auth, Realtime, Storage)
AI	Gemini 2.0 Flash, Anthropic SDK, MCP SDK
Email	Resend + react-email templates
Billing	Stripe (Checkout, Portal, Webhooks)
Deploy	Cloudflare Workers via OpenNext
Monorepo	Turborepo

Project Structure

siza/
├── apps/
│   ├── web/                  # Next.js 16 frontend
│   │   ├── src/app/          # App Router pages & API routes
│   │   ├── src/components/   # shadcn/ui components
│   │   ├── src/lib/          # Auth, Stripe, usage, features
│   │   └── e2e/              # Playwright E2E tests
│   ├── docs/                 # Fumadocs documentation site
│   ├── desktop/              # Electron desktop app
│   └── api/                  # Backend API service
├── packages/
│   ├── ui/                   # @siza/ui shared component library
│   └── eslint-config/        # Shared ESLint config
├── supabase/                 # Migrations (10), seed data
└── turbo.json                # Turborepo config

Development

npm run dev             # Start dev server (localhost:3000)
npm run build           # Build for production
npm run lint            # ESLint
npm test                # Unit tests (Jest)
npm run test:e2e        # E2E tests (Playwright)
npm run type-check      # TypeScript

Pricing

Free for individuals, paid for scale and convenience.

Tier	Price	Generations	Projects
Free	$0 forever	10/month (BYOK unlimited)	2
Pro	$19/month	500/month	Unlimited
Team	$49/month (5 seats)	2,500/month	Unlimited
Enterprise	Custom	Unlimited	Unlimited

The Forge Space Ecosystem

Siza is part of Forge Space — five open-source repos designed to work together:

Repo	Purpose
siza	AI workspace (this repo)
siza-mcp	12 MCP tools for UI generation
mcp-gateway	AI-powered tool routing hub
forge-patterns	Shared standards and MCP context server
branding-mcp	Brand identity generation

Deployment

Cloudflare Workers (Production)

Automated via GitHub Actions on push to main (production) or dev (preview):

1. Set GitHub Secrets: CLOUDFLARE_API_TOKEN, CLOUDFLARE_ACCOUNT_ID, NEXT_PUBLIC_SUPABASE_URL, NEXT_PUBLIC_SUPABASE_ANON_KEY, NEXT_PUBLIC_BASE_URL
2. Set GitHub Variable: CLOUDFLARE_DEPLOY_ENABLED=true
3. Deployment runs automatically via deploy-web.yml

Free Tier Architecture

Service	Free Tier
Cloudflare Workers	Unlimited bandwidth
Supabase	50K MAU, 500MB DB, 1GB storage
Gemini 2.0 Flash	60 RPM
GitHub Actions	2,000 min/month

Documentation

Full documentation is available in the apps/docs/ directory, built with Fumadocs:

npm run dev --workspace=apps/docs  # localhost:3001

Covers: quick start, self-hosting, configuration, MCP integration, API reference, and architecture.

Community

• GitHub Discussions — questions, ideas, show & tell
• Issue Templates — bug reports, feature requests, security reports
• Contributing Guide — how to contribute code and docs

Contributing

We welcome contributions. See CONTRIBUTING.md for guidelines.

1. Fork the repo
2. Create a feature branch from main
3. Make changes, run npm run lint && npm test && npm run build
4. Open a PR against main

License

MIT — see LICENSE.

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Part of the Forge Space ecosystem. Built by Lucas Santana.