Best UML Diagrams in 2025

Create diagrams and visualizations using text and code.

Key Mermaid features:

Ease of Use Integration Automated Diagrams Cost-effective

Open Source

A cloud-based diagram maker for companies, teams, and you.

Key Cacoo features:

Collaboration User-Friendly Interface Extensive Template Library Integration Options

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PlantUML is an open-source tool that uses simple textual descriptions to draw UML diagrams.

Key PlantUML features:

Simple Syntax Quick Diagram Creation Version Control Friendly Integrations

Open Source

Online diagramming application.

Key draw.io features:

Free User-Friendly Interface Collaboration Integrations

Open Source

gg is a free online diagram editor for flowcharts, process diagrams and network diagrams. It is also a light software architecture simulator.

Open Source freemium

Diagramly is an innovative tool that uses artificial intelligence to convert text descriptions or images into editable diagram code.

An open-source tool for generating flowcharts from text.

Key flowchart.fun features:

User-Friendly Interface Real-Time Collaboration No Sign-Up Required Automatic Layout

Open Source

Simplify and communicate complex information using data-linked diagrams.

Key Visio features:

Integration with Microsoft Ecosystem Wide Range of Templates and Shapes Cloud-Based Collaboration Robust Data Linking

LucidChart is the missing link in online productivity suites. LucidChart allows users to create, collaborate on, and publish attractive flowcharts and other diagrams from a web browser.

Key LucidChart features:

User-Friendly Interface Collaboration Features Integration Capabilities Template Library

A smarter way to create diagrams.

JavaScript based diagramming tool that renders Markdown-inspired text definitions to create and modify sequence diagrams dynamically.

Excalidraw is a whiteboard tool that lets you easily sketch diagrams that have a hand-drawn feel to them.

Key Excalidraw features:

User-Friendly Interface Real-Time Collaboration Free to Use Open Source

Open Source freemium $7.0 / Monthly

A modern AI-first PlantUML diagram editor.

Instead of starting with a blank screen, SmartDraw gives you the exact template you need.

Key SmartDraw features:

Ease of Use Extensive Template Library Collaboration Features Integration Capabilities