Open source · local-first · MCP-native

Architecture that stays useful after the workshop.

The open-source, self-hosted alternative to paid architecture tools. Model software systems with people and AI on the same source of truth — without accounts, cloud lock-in, or diagrams that drift away from reality.

Run StructSmith View source
1 container1 SQLite file0 telemetry

One semantic model. Every way of working.

Visual editor REST API AI via MCP→ Domain model + SQLite
Not another drawing canvas

Your diagram is a view.
The model is the truth.

Elements and relationships form the reusable model. Each view keeps its own structure, boundaries and layout. Change them in the editor, through REST, or with an AI assistant.

StructSmith / System context MCP
StructSmith system context diagram in the visual editor
Semantic by designElements are more than boxes
Always in syncAI changes appear live
A practical alternative to paid architecture suites

Enough structure to stay useful.
Light enough to keep using.

Model systems, not slides

C4-inspired elements and typed relationships live in one validated workspace. Views arrange them into purpose-specific diagrams and boundaries.

Local means local

No account, cloud dependency or telemetry. One container and one SQLite file keep ownership simple.

Change without fear

Revision guards, automatic snapshots and operation previews make larger model changes reviewable.

AI works on the architecture — not a screenshot

The built-in MCP server gives Codex, Claude, Copilot and other clients the same validated tools the UI uses. Inspect, model, review and document without translating the system into chat.

Connect your AI client
AI client · StructSmith MCP
youAdd a notification worker and connect it to the API.
toolmodel_apply_operations
3 operations appliedrevision 28 → 29
aiThe worker, queue relationship and container view are updated.
A shared architecture loop

Think together. Change once. See it everywhere.

01

Shape the model

Capture people, systems, containers and the relationships that make the design understandable.

02

Explore with AI

Ask for risks, unknowns, alternatives or a complete model update through structured MCP tools.

03

Share the right view

Create system context, container and tailored stakeholder views from the same source of truth.

Up in under a minute

Your architecture workspace,
without the platform tax.

Run the published image locally. Your model persists in a Docker volume and never leaves your machine.

Single command No configuration required Works fully offline
Dockerlocalhost:8090
$ docker run -d --name structsmith \
  -p 127.0.0.1:8090:8080 \
  -v structsmith-data:/data \
  ghcr.io/dziksu/structsmith:latest
StructSmith is readyOpen http://localhost:8090
Read the quick start

Make architecture a living part of the work.

Open source, self-hosted and ready to collaborate with your AI client.

Start locally Star on GitHub