About ZenUML

Help teams explain complex ideas and systems through clear diagrams and documentation that are easy to share and maintain.

Give people across teams and departments a common reference point for discussing designs, comparing options and making decisions.

ZenUML is P&D Vision's sequence diagram technology and open ecosystem. It works on its own and as an external plugin for Mermaid. Diagramly is P&D Vision's product family for AI-assisted information visualisation, exploring how teams turn complex information into visual knowledge they can share and maintain.

P&D Vision offers both ZenUML for Confluence and Diagramly for Confluence. ZenUML for Confluence is the mature, full-featured diagram app, including diagram-as-code and API specification workflows. Diagramly for Confluence is a separate, AI-first product that introduces new visual knowledge capabilities. Both are actively maintained. Diagramly for Confluence is not a renamed ZenUML for Confluence.

• 2007: At Motorola, hand-drawn sequence diagrams helped the team compare design options. The experience showed how much a sequence diagram can carry in a technical conversation.
• 2010: At a ThoughtWorks HTML5 coding contest, the first prototype generated a sequence diagram from text, using a small DSL and the Canvas API.
• 2013: The prototype was rebuilt in Angular and gained CSS styling, shortly before the founder moved to Australia.
• 2015: Work on payroll and funds-flow systems at ADP shaped the requirement for reliable, reviewable diagrams in regulated environments.
• 2017: The ZenUML GitHub organisation was created and the first open-source repository, web-sequence, was published under the MIT licence.
• 2019: The ZenUML plugin for JetBrains IDEs was released.
• November 2019: ZenUML Diagrams for Confluence launched on the Atlassian Marketplace.
• 2022: ZenUML Desktop for Mac and Windows released.
• 2023: The VS Code extension was released.
• 2024: Diagramly.ai launched.
• May 2025: ZenUML for Confluence moved to Atlassian Forge and split into Lite and Full plans.

We are developing Diagramly so that teams can express, share and maintain complex information and systems more naturally with the help of AI. ZenUML continues as the technical foundation and open ecosystem for sequence diagrams, rendering and developer workflows.

We will keep exploring how AI agents can work with Confluence, and which further diagram types can be maintained from text and code. These are long-term directions, not commitments to specific features or dates.

P&D Vision Pty Ltd is registered in Australia, with the core team in Melbourne. ZenUML also has team members in Shenzhen, Chengdu and Silicon Valley.

We support over 1,200 customers across six continents.