Free during open beta
Build UML diagrams in Raltey
Raltey covers class, sequence, activity, state, and use-case UML diagrams on the same canvas. The AI agent drafts each from a prompt; you can edit by hand or through chat.
What you can do
Built for UML diagrams that ship.
- Class diagrams with attributes, methods, and visibility modifiers.
- Sequence diagrams with synchronous and async messages.
- Activity, state, and use-case diagrams.
- Export to PNG, SVG, or PDF.
Try these prompts
Type, paste, done.
1.Class diagram for a Stripe-style billing service with Customer, Subscription, Invoice.
2.Sequence diagram for OAuth2 authorization code flow with PKCE.
3.Activity diagram for a multi-step refund approval process.
How it works
From prompt to UML diagram in three steps.
- 01
Pick the UML type or let the AI infer
Class, sequence, activity, state, or use-case. The AI proposes one from your prompt.
- 02
Generate and refine
Edit any element or ask the AI to add error paths and alternative branches.
- 03
Export
PNG, SVG, or PDF.
Who uses it
- Software design docs
- Architecture reviews
- Teaching UML
- Code interviews
Why Raltey for this
- One canvas covers all the common UML diagram types.
- AI understands UML semantics: visibility, cardinality, lifelines.
Frequently asked
Which UML diagram types are supported?
Class, sequence, activity, state, and use-case.
Is it free?
Raltey's Free plan includes the AI agent, 5 projects, and 10 AI generations per month. No credit card required.
Other diagram guides
Build flowcharts with RalteyBuild mind maps with RalteyDesign database schemas in RalteyBuild entity relationship diagrams (ERDs) in RalteyBuild sequence diagrams in RalteyBuild class diagrams in RalteyBuild activity diagrams in RalteyBuild state diagrams in RalteyBuild use case diagrams in RalteyBuild swimlane diagrams in RalteyBuild system architecture diagrams in RalteyBuild AWS architecture diagrams in Raltey
Build your first UML diagram in Raltey
Free plan includes the AI agent. No card required.