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Documentation Index

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MC Modeler is a free, zero-install web application for designing and documenting business processes using the BPMN 2.0 standard. It runs entirely in any modern browser — Chrome, Firefox, Safari, or Edge — on macOS, Windows, or Linux, without requiring plugins, extensions, or a user account. Open the URL, start modeling, and your diagrams are saved automatically to your browser’s local storage from the very first keystroke.

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Why MC Modeler Exists

Bizagi Modeler is the gold standard for BPMN tooling, but it has no native macOS client, and its web counterpart has inconsistent availability. Camunda Modeler is a capable desktop alternative but requires a local installation. MC Modeler fills the gap: full BPMN 2.0 modeling that works on every OS, costs nothing, and requires no setup.

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Who It’s For

Business Analysts

Document as-is and to-be processes with the full BPMN 2.0 element set, then export files that open natively in Bizagi or Camunda.

BPM Consultants

Work on client engagements from any device — a MacBook in a client office, a Windows machine at home — without installing anything.

Students & Academics

Learn BPMN 2.0 with a tool that enforces the standard, validates your diagrams, and is always free.

Digital Transformation Teams

Collaborate on process maps in the cloud with real-time sync, invite-based access control, and a shared image library.

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Key Differentiators

MC Modeler is a pure browser SPA (React 19 + Vite). There is nothing to download or update. Any browser at resolution 1280×768 or higher is supported.
The modeling engine is bpmn-js v18, maintained by Camunda and certified against the OMG BPMN 2.0 specification. Diagrams export using the official OMG namespace (http://www.omg.org/spec/BPMN/20100524/MODEL), making every .bpmn file openable in Bizagi Modeler and Camunda Modeler without conversion. Proprietary extensions (e.g. bizagi: attributes) are preserved on round-trip so no information is lost when exchanging files with Bizagi users.
The entire interface — palette labels, property names, validation messages, and tooltips — is available in both Español and English. Switching languages is a single click in the toolbar; the preference is saved automatically.
A dark theme (the default, matching the design prototype) and a clean light theme are both built in and toggle instantly.
Diagrams can be exported as BPMN 2.0 XML (.bpmn), PNG at 1×/2×/3× resolution, scalable SVG, and PDF (A4 landscape or portrait with a header containing the diagram name).

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Persistence Modes

MC Modeler has two persistence modes that coexist in the same codebase. The active mode is determined solely by whether Supabase environment variables are present at build time.
When no Supabase credentials are configured, the app stores all diagrams in the browser using IndexedDB (via localforage, with a localStorage fallback). This mode requires no account, no internet connection, and no server of any kind.What’s available in local mode:
  • Unlimited diagrams (subject to browser storage limits — typically 50–250 MB for IndexedDB)
  • Auto-save with a 2-second debounce
  • Thumbnails generated from the live canvas
  • Folder organisation, import, and the full export suite
Diagrams in local mode exist only in the browser where they were created. Clearing browser storage, switching browsers, or opening the app on a different device will not show your local diagrams. Export important work regularly as .bpmn files.

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Feature Roadmap

The project is developed in three phases:
PhaseStatusHighlights
Phase 1 — MVP✅ CompleteFull BPMN 2.0 canvas, palette, properties panel, undo/redo, local persistence, export (BPMN/PNG/SVG/PDF), validation, i18n
Phase 2 — Cloud & Auth✅ CompleteSupabase backend, authentication, cloud sync, collaboration invites, comments, notifications, image library
Phase 3 — Real-time & Community🔄 In progressYjs real-time co-editing, version history, shared diagram links, community theme system

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Next Steps

Quickstart

Create your first BPMN 2.0 diagram in under five minutes — no sign-in required.

Self-Hosting

Deploy MC Modeler with your own Supabase project to unlock cloud collaboration.

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