Sequence diagram builder

PLAN

Add services, nest calls inside one another, and export clean, time-ordered XML you can open in draw, no dragging, no hand-editing.

SERVICES 0
CALLS    0
GAP      4 sq
Services (0)
Calls (0)
Combined fragments (0)
Live preview arrow gap 4 sq

Solid = call, dashed = return, bars = a service is active. A nested call's bar sits inside its parent's.

Generated XML

Full file → save & open. Page only → in draw.io use Extras → Edit Diagram and paste.