Free during open beta
Build sequence diagrams in Raltey
Describe a flow like "OAuth2 authorization code with PKCE" and Raltey drafts the matching sequence diagram with actors, lifelines, and messages on the canvas.
What you can do
Built for sequence diagrams that ship.
- Actors, lifelines, sync/async messages, and returns.
- Alt, opt, par, and loop fragments.
- Activation bars and self-calls.
Try these prompts
Type, paste, done.
1.Sequence diagram for OAuth2 authorization code with PKCE.
2.Stripe checkout including the async webhook callback.
3.Add an alt fragment for the case where the user has no payment method.
How it works
From prompt to sequence diagram in three steps.
- 01
Describe the flow
Mention actors and the order of calls. The AI proposes lifelines and messages.
- 02
Refine
Add fragments (alt, opt, par), rename actors, or split into a sub-sequence.
- 03
Export
PNG, SVG, or PDF.
Who uses it
- API design
- Auth flows
- Distributed systems
- On-call runbooks
Why Raltey for this
- AI infers fragments (alt/opt/par) from descriptions, not just messages.
Frequently asked
Does the workflow support alt and par fragments?
Yes. Describe the conditional or parallel branch and the AI adds the fragment.
Is it free?
Raltey's Free plan includes the AI agent, 5 projects, and 10 AI generations per month. No credit card required.
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Build your first sequence diagram in Raltey
Free plan includes the AI agent. No card required.