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UML diagram tool

Create UML diagrams online with Cacoo

Plan & optimize systems with use case diagrams

To make anything work, you have to understand what factors contribute to the outcome. Visualize how users or other systems interact with yours to create website, apps, or even business processes.

Document software with class diagrams

Whether you're onboarding a new team member or discussing key structural changes, a class diagram can help you quickly understand the structure of your system by laying out all classes, including their attributes, operations, and relationships to other objects.

Ensure proper functionality with sequence diagrams

Capture how objects interact in a sequence including the sequence of messages exchanged between those objects that carry out the functionality of the scenario.

Cacoo makes it easy to create UML diagrams online

Use our extensive collection of UML templates, shapes, and notations

Create use case diagrams, sequence diagrams, class diagrams, activity diagrams, state machine diagrams, and more.

  • Industry-standard UML shapes
  • Easy drag and drop interface
  • Custom shapes

Collaborate with anyone in real-time

Create, edit, and chat about your UML diagrams, together.

  • Multi-user editing
  • In-app video & chat
  • Comments on diagrams
  • Activity notifications

Present and share your work

Share your UML diagrams with others.

  • Presentation mode
  • Screen Share
  • Shared folders
  • Public diagram links
  • Exporting (SVG, PDF, and more)
  • Embeddable diagram viewer

Keep files organized and secure

Keep UML diagrams organized with shared project folders.

  • Team management
  • Security settings
  • Groups for easy access
  • Guest access

How to make an UML diagram

1

Set goals & objectives

Determine what requirements need to be met for your system to be considered successful.

2

Use the importer tool or start from a template or blank diagram

However you get your architecture on the canvas, make sure you accurately represent your current structure before you start making changes.

3

Assess your diagram for opportunities and risks

Look at your current architecture and determine where you can add or improve things.

4

Stylize shapes and lines

Customize your colors, text, and lines to make things easy to read.

5

Collaborate and share

Get feedback from others, make any necessary edits, and share with the right people once it's finalized.

Use our UML diagram templates to get started

Or create your own from scratch.

Sequence Diagram Template
Sequence Diagram Template
Sequence Diagram Template
Sequence Diagram Template
Activity Diagram Template
Activity Diagram Template
Activity Diagram Template
Activity Diagram Template
Class Diagram Template
Class Diagram Template
Class Diagram Template
Class Diagram Template
UML Diagram Template
UML Diagram Template
UML Diagram Template
UML Diagram Template
UML Sequence Diagram Loop
UML Sequence Diagram Loop
UML Sequence Diagram Loop
UML Sequence Diagram Loop
Use Case Diagram Template
Use Case Diagram Template
Use Case Diagram Template
Use Case Diagram Template

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