Pumler Learn

Make diagrams work like code.

Practical guides for creating diagrams that are reviewable, repeatable, and easy to keep up to date.

• Jul 22, 2026 ·14 min read

  PlantUML Sequence Diagrams: Syntax, Examples, and an Online Editor

  Learn PlantUML sequence diagram syntax with practical examples of activation bars, return messages, loops, and alternatives. Try them in our online sequence diagram editor.

• Jul 19, 2026 ·22 min read

  What Is UML? A Practical Guide to the Unified Modeling Language

  Learn what UML is, how UML diagrams model software structure and behavior, where they help, their trade-offs, and how teams use them in practice.

• Jul 18, 2026 ·16 min read

  Mouse-drawn diagrams vs text-to-diagram: which workflow actually scales?

  A practical comparison of drag-and-drop diagramming and diagrams as code, with honest trade-offs, code examples, and advice for choosing the right workflow.