The Need for a Modern UML and Diagram Engine (Part 1)

How It Started I am a backend software engineer, primarily working in the Java ecosystem. Most developers in my space know about PlantUML and have probably been using it for years—I certainly have. PlantUML has long been a go-to tool for developers who need a robust way to write UML diagrams as code. But let's face it: PlantUML is showing its age. As powerful as it is, PlantUML can feel slow, its default look-and-feel is dated, and its interactive feature set has lagged behind modern development workflows. That is a major reason why alternatives have gained so much ground. Tools like Draw.io and Mermaid.js have steadily captured a large portion of the mindshare that PlantUML once held. While Draw.io is a visual drag-and-drop tool rather than a pure text DSL, it offers rich component sets and high customizability. However, text-based versioning and quick code playback aren't its primary strengths. On the other hand, Mermaid.js brought text-to-diagramming into the modern web. It is fast, renders across browsers and IDEs, offers an accessible DSL, and integrates directly into platforms like GitHub and Notion. Yet, I felt we could take this concept even further. We need something more modern, more customizable, and more tactile—a text-to-diagram engine that is fast, easy to learn, and visually sharp, while bridging the gap between raw code and visual canvas control. Introducing DrakoFlow For a long time, I’ve dreamed of having a diagram engine that makes sharing architecture effortless. A tool that enhances the documentation experience rather than standing in the way of it. So, I finally decided to build it. I wanted DrakoFlow to be fast, robust, and elegant—not only in its syntax, but in its visual output. Most importantly, I wanted it to be 100% free, open-source, and privacy-first (running entirely in the browser with zero server dependencies). Building it was a challenge. As a backend developer, creating a heavily interactive, client-side web application meant stepp