BI · Free template
Sequence diagram template — free online editor
Lifelines with messages between actors. Edit in your browser, export PNG/SVG/PDF, and share a view link.
Common use cases
- Show request/response flow between services
- Document API and database interactions
- Clarify auth or checkout sequences for devs
SequenceAPIUML
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From diagram to shipped software
Many clients start with a diagram in NorthIRdev, approve the architecture in the client portal, then hire us to build the production app — portals, payments, automation, and AI where it helps.