Composer is an AI agent-powered email editor that auto-detects your brand, composes emails through conversation, and exports production-ready HTML for every client.
Built with React Email · Vercel AI SDK · LangSmith
From brand to inbox in four simple steps.
Enter your company URL and Composer auto-extracts your brand colors, logo, and typography. Your emails match your brand from the start.
Describe your email in plain English. The AI agent builds it component by component — subject lines, hero images, CTAs, and more.
See a live preview as you work. Drag-and-drop to reorder sections, or ask the agent to iterate on tone, layout, or content.
Export production-ready HTML that renders perfectly in Gmail, Outlook, Apple Mail, Yahoo, and every major email client.
An AI-native email editor that handles the hard parts so you can focus on your message.
Enter your company URL and get brand colors, logo, and typography extracted automatically. No manual setup required.
Compose emails through natural dialogue. Describe what you want, and the AI agent builds it in real-time.
Full AI tracing and observability for every agent interaction. Debug, evaluate, and improve your AI workflows.
Generates production-ready HTML that works flawlessly in Gmail, Outlook, Apple Mail, Yahoo, and all major clients.
Built on React Email for modern, component-based email architecture. Type-safe, testable, and maintainable.
Start from professionally designed templates for newsletters, promotions, transactional emails, and more.
See your email update in real-time as you chat with the agent. Drag-and-drop to rearrange components instantly.
Manage multiple brand identities in one workspace. Switch between brands seamlessly for different campaigns.
The AI agent suggests subject lines, preview text, and content optimizations based on email best practices.
Composer generates production-ready HTML that renders perfectly everywhere.
MIT Licensed. Community-driven. Fully transparent. Composer is open source because great tools should be accessible to everyone.