Features

Everything UML Wizard does, from drawing the first class to generating the code behind it.

Diagrams

Seven diagram types, organised in projects

UML Wizard draws a practical subset of UML 2.5.1 notation. Keep every view of a system in one project file, grouped in folders, and switch between them in tabs.

Class — classes, abstract classes, interfaces, enumerations; inheritance, realization, association, aggregation and composition with multiplicities.
Sequence — actors and lifelines; synchronous calls, replies and asynchronous messages.
State machine — initial and final states, choices, guards, effects and self-transitions.
Activity — actions, decisions and merges, forks and joins.
Use case — actors, system boundaries, «include», «extend» and generalization.
Component — components, provided interfaces and dependencies.
Deployment — devices, nodes, nested execution environments, artifacts and «manifest».

A class diagram open in UML Wizard, with the Project Explorer listing the diagrams of the Online Shop sample

Editing

Fast to draw, easy to polish

Type in UML notation where the element is, and let the diagram follow.

In-place editing

Double-click or press F2 and type -status: OrderStatus = New; UML Wizard parses visibility, types and defaults.

Undo, redo, clipboard

Every change is undoable. Cut, copy and paste elements within and between diagrams.

Arrange Diagram

Lay out a diagram automatically, whatever its type, then fine-tune by hand.

Fonts, colours, lines

Format fills, borders, line colours and thickness, and stacking order; set defaults per diagram type.

Notes and tagged values

Attach notes to elements, add free text boxes, and record tagged values on diagrams, classes and members.

Light and dark themes

Pick a theme, the interface font and display language in Preferences (Ctrl+,).

Code generation

From class diagram to source files

Choose Diagram → Generate Code…, pick a language, a namespace and an output folder. UML Wizard lists the files it will write, marks those it would replace, and notes anything a language cannot express.

C#JavaKotlin TypeScriptRubyC++17

How to generate code →

Diagram	Becomes (C#)
Class / abstract class	`class`, `abstract class`
Interface	`interface`
Enumeration	`enum`
Attribute	auto-property, or `_field` when private
Association end	private field, `List<T>` when many
Operation	method that throws `NotImplementedException`

Code import

Reverse-engineer an existing codebase

Import a folder of C#, C++, Java, Kotlin, Ruby or TypeScript code and get a class diagram of its types, members and relationships. The namespace each class came from is kept as a tagged value.

src/
├─ Domain/
│  ├─ Order.cs
│  ├─ OrderLine.cs
│  └─ Customer.cs
└─ Payments/
   └─ IPayable.cs

  ↓  File → Import Source Folder…

Class diagram: 4 types, 5 relationships

Interoperability

Works with the tools you already use

PlantUML

Import and export every diagram type as PlantUML text, for docs-as-code and version control.

OpenAPI

Import an API description as a class diagram, and export it back without losing what the diagram cannot show.

PNG export

Export any diagram as a PNG image, with a white or transparent background.

AI assistant — optional

A model that suggests; UML Wizard that decides

The assistant is off until you set up a service in Preferences. When it is on:

Diagram → Create with AI draws a new diagram, of any type, from a description.
View → AI Chat (Ctrl+Alt+I) discusses the active diagram and proposes changes, which you apply as one undoable step.
The model's output is parsed and validated by UML Wizard itself; invalid output is never drawn as is.
Use Claude, any OpenAI-compatible service, or a local model with Ollama or LM Studio to keep diagrams on your machine.
API keys are kept in the operating system's credential store, never in the settings file.

Draw the state machine of a support ticket: open, in progress, waiting for customer, resolved and closed.

Here is a state machine with 5 states, an initial and a final state, and transitions for assign, ask customer, reply, resolve and reopen.
Create diagram ↵

Plug-ins

Add a language without touching the app

Every code generation and code import language ships as a plug-in DLL. Write your own against a small interface, drop it next to the application, and it appears in the language list.

Writing a code generator plug-in →
Writing a code import plug-in →

Keys	Action
`F2` / `Enter`	Edit in place / open the Edit dialog
`Ctrl+Z` / `Ctrl+Y`	Undo / redo
`Ctrl+Plus` / `Ctrl+Minus` / `Ctrl+0`	Zoom in / out / actual size
`Ctrl+Alt+L`	Show or hide the Project Explorer
`Ctrl+Alt+I`	Show or hide the AI chat
`F1`	Open the User Manual

Try it on your own system

Windows, macOS and Linux. No installer, no runtime to install.

Download UML Wizard Read the User Manual