Diagram in seconds, no DSL vs. C4-as-code discipline
Structurizr is purpose-built for the C4 model: one model written in a DSL, many rendered views, versioned in git. Diagrams.so turns plain English into an editable .drawio diagram with no syntax to learn.
Overview
Structurizr, created by Simon Brown, is the reference tooling for the C4 model. You describe your software architecture once in the Structurizr DSL, and it renders that single model into consistent system-context, container, and component views that stay in sync and version in git. That single-source-of-truth discipline is its real strength and is not what Diagrams.so sets out to do. Diagrams.so trades the model for speed: describe a system in plain English and get an editable diagram back in seconds, openable by anyone, with no notation to learn first.
Why teams choose Diagrams.so
- No DSL or modelling notation to learn, describe the system in plain English
- Editable .drawio output that anyone can open in Draw.io, Confluence, or VS Code
- Official AWS, Azure, GCP, and Kubernetes icons auto-selected from the description
- Architecture warnings flag single-AZ, public exposure, and missing boundaries
- From idea to diagram in seconds, with no model to build and maintain first
- Free tier with 10 credits and no credit card required
- Import existing .drawio files for free on all plans
Feature comparison
| Feature | Diagrams.so | Structurizr |
|---|---|---|
| Method | Freeform architecture diagram | C4 model (context, container, component) |
| Input method | Plain English | Structurizr DSL (code) |
| Single source of truth | Per-diagram files | One model to many views (its core strength) |
| Learning curve | None, describe what you want | Learn the C4 model and the DSL |
| Output format | .drawio XML (editable) | Rendered views (PNG/SVG); DSL kept in git |
| Version control | Commit the file; in-app version history | Native, the text model diffs in git |
| Cloud icons | Official AWS/Azure/GCP/K8s, auto-selected | Icon themes including cloud provider sets |
| Architecture warnings | Built-in best-practice checks | Not a validation engine |
| Import .drawio files | Yes, free on all plans | N/A or requires manual upload |
Verdict
Structurizr is the better choice when you want C4-as-code rigor: a single model that stays the source of truth, rendered into consistent views and versioned in git. Diagrams.so is the better choice when you want a diagram in seconds from a plain-English description, editable by anyone, with no DSL or model to maintain.
Ideal for: Structurizr is ideal for teams committed to the C4 model who want their architecture defined as code. Diagrams.so is ideal for anyone who wants a fast, editable architecture diagram without learning a notation.
Frequently asked questions
Is Diagrams.so a good alternative to Structurizr?
For teams that want a diagram fast without adopting a modelling method, yes. Structurizr is purpose-built for the C4 model as code, which is a genuine strength if you want a single model rendered into consistent views. Diagrams.so takes plain English and returns an editable .drawio diagram with no DSL to learn.
Do I need to learn the C4 model or a DSL to use Diagrams.so?
No. You describe the system in plain English and the AI produces the diagram. Structurizr, by contrast, expects you to define a model in the Structurizr DSL, which is exactly what makes it powerful for disciplined C4-as-code work.
Can I keep one model and generate several consistent views like Structurizr?
Not in the same way. That one-model-many-views capability is Structurizr's core strength and single source of truth. Diagrams.so works per diagram: each generation is its own editable .drawio file rather than a view onto a shared model.
Does Diagrams.so export to draw.io?
Yes. Diagrams are native .drawio (mxGraphModel) XML, editable in Draw.io, Confluence, and the VS Code extension. Structurizr renders its model to views such as PNG and SVG and keeps the model itself as DSL in git.
Which is better for architecture-as-code kept in git?
Structurizr, if you want the model itself to live in version control and diff as text. Diagrams.so gives you a .drawio file you can commit, but it is a diagram you own rather than a code model that regenerates the views.