SysML Studio

Help & Documentation

Everything you need to know to create, edit, and share SysML v2 diagrams in SysML Studio.

Getting started

SysML Studio runs entirely in your browser — no installation, no plugins. To begin:

  1. Visit app.sysml.pro and click Sign In (top right).
  2. Create an account with email + password, or continue as a guest (guest diagrams are saved only in your browser).
  3. Once signed in, click + New Diagram and pick one of the 10 diagram types.
  4. Drop elements from the left sidebar onto the canvas, or type SysML v2 code in the bottom editor — the visual and code views stay in sync automatically.

Your work autosaves every 4 seconds once you're signed in. A green Saved ✓ indicator appears in the header after each save.

Diagram types

SysML Studio supports the ten main diagram kinds defined in the OMG SysML v2 specification:

BDD — Block Definition

Structural decomposition: parts, attributes, inheritance.

PKG — Package

Namespace organization and module boundaries.

REQ — Requirements

Requirement definitions and satisfy/trace relationships.

IBD — Internal Block

Parts, ports, connections, and item flows.

STM — State Machine

States, transitions, entry/exit actions, and triggers.

UC — Use Case

Actors, use cases, include/extend relationships.

SEQ — Sequence

Lifelines, messages, and interaction ordering.

ACT — Activity

Actions, control flow, and pin-based object flow.

PAR — Parametric

Constraint blocks and parameter bindings.

MIX — Mixed

Combine multiple diagram kinds in one view.

Editing basics

Adding elements

Drag elements from the left sidebar onto the canvas. Use the tool palette in the header to switch between select, block, and relationship tools. Double-click any element to rename it inline.

Drawing relationships

Pick a relationship tool (composition, generalization, etc.) then click the source block, then the target block. Lines are always orthogonal — you can grab and drag any middle segment to reroute.

Editing text

The code panel at the bottom is a full Monaco editor (same engine as VS Code) with syntax highlighting for SysML v2. Edits there immediately update the canvas, and vice versa.

Undo / redo

Every mutation is undoable. The history stack holds up to 50 steps per diagram. See keyboard shortcuts below.

Collaboration

Real-time multi-user editing is available on the Pro plan. To invite collaborators:

  1. Open the diagram you want to share.
  2. Click the Share button in the header — a share link is generated.
  3. Send the link to your collaborator.

When someone joins, you'll see their presence indicator in the header and their cursor on the canvas. When a user selects an element, it's temporarily locked for other users — you'll see a colored border and the editor's name.

Collaboration uses Supabase Realtime with WebSocket broadcast. Your diagrams never leave the Supabase infrastructure.

Export & save

From the Export menu in the header you can download:

Cloud saves happen automatically every 4 seconds. You can also trigger a manual save with Ctrl + S.

Keyboard shortcuts

Action Shortcut
Save Ctrl + S
Undo Ctrl + Z
Redo Ctrl + Shift + Z
Delete selected Del or Backspace
Zoom in / out Ctrl + + / Ctrl + -
Fit to screen F
Select tool V
Pan canvas Click + drag empty area
Rename element Double-click

Note: on macOS, use ⌘ in place of Ctrl.

Privacy & your account

SysML Studio is designed with privacy-first principles. A few key points:

For the full legal details, see our Privacy Policy and Cookie Policy.

Get support

Three ways to reach us:

For the current system status, see the status page. For what changed recently, see the changelog.