I Built My Own Diagramming Tool — No Framework, No Runtime, Just Canvas

I Built My Own Diagramming Tool — No Framework, No Runtime, Just Canvas Terry Davis had a point. Not the most comfortable quote to open with in 2025, but the idea sticks: if you rely on tools without understanding them, you don't really own your work. I've been using Draw.io and Excalidraw for years. Great tools. But every time I needed to explain an architecture, sketch a flow, or share a quick diagram during a call, I found myself fighting the tool instead of thinking. So I built Markasso. The name is straightforward: Marker + Picasso. A whiteboard engine for the browser, built from scratch — no dependencies, no framework, no runtime. Just the canvas API and a keyboard-first philosophy. Why from scratch? Because I wanted to understand every line of it. And because "zero dependencies" isn't a performance optimization — it's a design constraint that forces clarity. When you can't reach for a library, you have to think harder. The result is something lighter, faster, and fully yours. Un