Sequence Diagrams From a Plain English Flow Description
Describe who calls whom and what happens on failure. Get back a proper UML sequence diagram with correct sync/async arrows — no manual actor/lifeline setup.
Sequence diagrams are the clearest way to explain an API flow, but drawing lifelines and arrows by hand is slow. Describe the flow in plain English (who calls whom, what comes back and which steps are asynchronous) and CloudSketch AI draws a UML sequence diagram with the right arrow for each message.
See an example
“A user submits a checkout request to the API Gateway, which calls the Payments service. Payments calls the external Stripe API. On success, Payments publishes an OrderPaid event which the Fulfillment service consumes.”
Drawing the diagram…
An example of the diagram this prompt describes. Your own result can differ in layout and detail.
Swipe sideways to see the whole diagram.
Correct arrow semantics
Synchronous calls, async messages, and responses are distinguished automatically, matching UML conventions.
Handles branching flows
Describe success and failure paths, retries, or async events and see them represented as separate, readable flows.
Sprint and RFC ready
Export for sprint design reviews, incident postmortems, or onboarding new engineers to a flow.
Where teams use it
API design and RFCs
Show reviewers exactly how a new endpoint fits into existing services.
Incident postmortems
Reconstruct which service called which, and where the failure happened.
Onboarding
Walk new engineers through login, checkout or payment flows step by step.
Frequently Asked Questions
Can it show error/failure paths?
Yes — describe the failure branch in your prompt (e.g. "on timeout, retry once, then fall back to X") and it will be represented in the diagram.
Is the sequence diagram generator free?
Yes. Sequence diagrams are on the free plan (10 diagrams a day with a free account, 3 without signing in). Pro removes the daily limit.
Does it show asynchronous messages?
Yes. Describe events or queues (for example, 'publishes an OrderPaid event') and they are drawn as asynchronous arrows, separate from request and response calls.