Building a Mobile Interface for My Second Brain with n8n and Matrix

Wed, 21 Jan 2026 14:00:00 +0000

My org-roam knowledge base is the center of how I think and work. But it lives in Emacs, which means I can only capture ideas when I’m at my computer. I wanted a way to feed my second brain from anywhere, using just my phone—but I refused to put my notes in someone else’s cloud. The solution had to be entirely self-hosted. What I built combines Matrix for messaging, n8n for orchestration, and an MCP server that bridges to org-roam, all running on my own infrastructure.

N8n on Hullabalooing

Building a Mobile Interface for My Second Brain with n8n and Matrix