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OnUml

OnUML: AI-powered UML diagram generator for developers. Create UML diagrams & flowcharts using natural language with real-time preview.

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Published on:

September 15, 2025

Pricing:

OnUml application interface and features

About OnUml

OnUML is a lightweight, browser-based diagramming tool focused on Mermaid.js, enhanced with AI-assisted chat input. Designed for developers, technical writers, and software architects, it simplifies the creation of UML diagrams and flowcharts through natural language prompts and real-time rendering. Key features include AI-Assisted Mermaid Generation, Live Diagram Rendering, Built-in Mermaid Editor, Automatic Syntax Fixes, Code Saving and Organization. I highly recommend this tool for creating UML diagrams, especially for the real-time UML preview feature.

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