MapleSpire – Open-source C4 architecture modelling, offline-first

MapleSpire replaces diagrams that drift out of date with one shared model: every object exists once, every view reflects it, and tags and technologies are managed in one place for the whole organization.

Every object and relationship exists exactly once. Diagrams reference them, so renaming a service or fixing a dependency updates every view it appears in.

Systems, containers, components and dependencies read at a glance, then open up to the level of detail each conversation needs.

Edit together in real time or keep working offline: your changes sync as soon as the network is back.

From a system description to a living C4 model: AI, connected views, offline editing, decision records, drafts, collaboration, MCP and 3D.

English and French captions available on YouTube.

In drawing tools and DSLs alike, tags and technologies are free text, copied from element to element and repository to repository. MapleSpire keeps them in organization-wide catalogs, so a fix made in the right place applies everywhere.

Tags and tag groups are defined once for the whole organization. Renaming, recoloring, merging or archiving a tag applies to every object that carries it, across every landscape.

Technologies come from a managed catalog with aliases, icons and a lifecycle (active, deprecated, retired). Each usage records the version in use, and new entries go through submission and approval.

Organization roles, teams with read or write grants per landscape that inherit downward, and OIDC single sign-on with Google or Microsoft.

Prepare a change in a draft, review the change list, then merge with conflict detection. Per-diagram history, restore points and ADRs complete the audit trail.

MapleSpire’s code is published under the AGPL-3.0 license. Host it yourself with Docker Compose, or try the hosted demo first — it is built for evaluation, not production.

No per-editor licensing: the software and its demo are free.

Public code under the AGPL-3.0 license at github.com/MapleSpire/maplespire.

Docker Compose with PostgreSQL and Redis: your data stays on your infrastructure.

Compare MapleSpire with IcePanel, Structurizr, Visio, draw.io and diagram-as-code tools. This grid separates native C4 capabilities from manual work, and centrally governed metadata from free text.

Prices are public list prices in USD where available, before tax. “C4 Model” is a method, not software. Plans change: follow the descriptively labelled official sources in each row.

A system to model, a team to equip, a self-hosting project or a migration from Structurizr: write to us and we will get back to you directly.