Claude Design’s open-source, offline-capable rival

What it does Open CoDesign is an MIT-licensed Electron app that generates interactive prototypes, slide decks, and marketing assets from plain-text prompts. It connects to the model you already subscribe to — Claude, GPT, Gemini, Ollama, DeepSeek, and others — and keeps the entire workflow on your laptop. Finished work exports to HTML, PDF, PPTX, ZIP, or Markdown.

The interesting bit The tool is aggressively local-first: your prompts, API keys, and file history stay on-device, not in a cloud workspace. It also exposes a live agent panel that streams todos and tool calls, so you can watch the model plan, write, and self-check before deciding whether to let it finish or interrupt.

Key highlights

• BYOK multi-model support: works with 20+ providers including Claude, GPT, Gemini, Ollama, OpenRouter, and direct ChatGPT Plus sign-in for Codex
• Pin-based commenting: click any element to drop a note and have the model rewrite only that region instead of regenerating the whole artifact
• AI-tuned sliders surface tweakable parameters — color, spacing, typography — without firing off another full prompt
• Editable exports to HTML, PDF, PPTX, ZIP, and Markdown
• Workspace-backed local sessions with version history and interruptible generation

Caveats

• Installers are currently unsigned, so macOS Sequoia 15+ and Windows will throw Gatekeeper or SmartScreen warnings until manually bypassed
• Several package-manager channels — winget, Flathub, and Snap Store — remain pending or deferred

Verdict Worth a look if you want AI-generated prototypes without subscribing to yet another closed cloud tool. Give it time if you require signed installers and fully wired package-manager distribution.