# Structurizr review (2026): is the free plan enough?

> Open-source models-as-code tool for C4 architecture diagrams

Checked Nov 13, 2026 · graded Nov 13, 2026 by ToolGPA.

Structurizr lets you describe a software system in a text-based DSL and generates several C4 model diagrams from that single model. It was created by the author of the C4 model. Tools include a browser playground, a local viewer, a command-line exporter and a self-hosted server.

- **Category:** Whiteboards & Mind Maps
- **Made by:** Structurizr Limited
- **Website:** https://structurizr.com
- **Runs on:** Web
- **Who should skip it:** Skip it if you want to drag shapes around, as it's code first.
- **Facts last checked:** Nov 13, 2026

## Pricing

As of Nov 13, 2026, Structurizr has a free plan, and paid plans start at £300 per month for up to 20 unique users, per server installation.

- **Pricing model:** Free plan
- **Free plan:** Open-source tools: the browser playground, local viewer, CLI export and a self-built open-core server.
- **Free trial:** 14-day trial license on request that unlocks all features.

| Plan | Price | What you get |
| --- | --- | --- |
| Open source | $0 | Playground, local, export CLI and the open-core server you build yourself; you host it. |
| Server license, 1-20 users | £300 per month, per server installation | Prebuilt server binaries with enterprise features, priced by unique users in a year; sold by quote. |
| Server license, 21-50 users | £600 per month, per server installation | The same prebuilt server; 51-100 users is £900 and 101-250 is £1,200 a month. |
| Server license, 1001+ users | £2,400 per month, per server installation | Largest published tier; 251-500 users is £1,500 and 501-1000 is £1,800 a month. |

Read from https://docs.structurizr.com/server/pricing on Nov 13, 2026. Prices change, so confirm with Structurizr before buying.

## Key features

- **Models as code:** Write the Structurizr DSL once and generate system context, container, component, dynamic and deployment diagrams from it.
- **Interactive diagrams:** Diagrams can be zoomed, animated and embedded, and include an automatically generated key.
- **Several ways to run it:** Use the browser playground, view diagrams locally, or run the self-hosted server as a Docker image or Java .war file.
- **Export to other formats:** A CLI tool exports views to PlantUML, Mermaid or a static HTML site.
- **AI and MCP support:** A free, open-source MCP server parses and validates DSL, exports diagrams and manages workspaces on a Structurizr server.
- **Manual layout:** Diagrams use manual layout that can be adjusted in the local viewer, rather than auto-layout only.

## Good for

- Developers who prefer diagrams as code kept in version control
- Teams that want a reference C4 model implementation
- Organizations that need to host architecture diagrams themselves

## Worth knowing

- Using the server through the vendor's prebuilt binaries needs a paid license; building it yourself is open core.
- Prices are published in pounds sterling and are charged by unique users per server installation.
- Licenses are bought by contacting the vendor, with payment by bank transfer or PayPal invoice, and are non-refundable.
- It is a code-driven diagramming tool, not a freeform whiteboard.

## ToolGPA grades

**GPA: 2.6 out of 4**, graded Nov 13, 2026. Structurizr describes a software system in a text language and generates C4 diagrams from it, with a browser playground, a viewer and a command-line exporter free and open source. The prebuilt server needs a paid license from £300 a month, and it expects you to be comfortable with code.

- **Value for money: A.** The playground, local viewer and command-line export are free to download and use. Only the prebuilt server costs, at £300 a month for up to 20 users.
- **Free plan and trial: B.** Open-source tools with no cap, but the prebuilt server needs a paid license, and building the open-core server yourself is up to you. A 14-day trial license is on request.
- **Features: C.** Models as code, interactive diagrams, export to other formats and AI support. It does the C4 job completely, but it's a smaller job than a general whiteboard.
- **Ease of use: D.** You write a text language, use a command line and, for the server, host it yourself with Docker.
- **Platforms and integrations: B.** Web playground plus a local viewer, command-line exporter and server, with PlantUML, Mermaid, S3 and Azure storage connections.

These are ToolGPA's own grades. Graded from this listing, whose facts were read from Structurizr Limited's own pages on 13 November 2026. Not based on using the product, and shorter than our full reviews.

## Where it stands among whiteboard and mind map tools

- Structurizr's GPA of 2.6 is higher than 58 of the 98 other whiteboard and mind map tools we grade, and level with 16.
- It stands best on value for money (A, above 74 of 98) and worst on ease of use (D, above 0).
- Its paid plans start at about $401.97 a month, against a middle price of $8 for the category: 69 of the 69 others that charge start lower.
- On features, ease of use and platforms it scores 2.0 out of 4. 65 tools score higher and cost less.

The category's chart of price against score: https://toolgpa.com/charts/whiteboards

## Keep it, or make your own?

**Keep it.** Nothing Structurizr does is plain enough to make in a weekend. The 3 things listed below take a company. It costs $4,823.60 a year. Structurizr is open source, so there is a third way: take its code and run it yourself.

- You could not: A diagram editor.
- You could not: It plugs into other products, PlantUML, Mermaid and Docker among them.
- You could not: AI features, unless you pay a model provider for each request yourself.

A judgement by ToolGPA from this listing, by rules that are the same for every tool. Nothing was built to test it.

## Works with

PlantUML, Mermaid, Docker, Amazon S3, Azure Blob Storage

**Tags:** Diagrams, Open source, Self-hostable, AI features

## Alternatives

- [IcePanel](https://toolgpa.com/tools/icepanel): Software architecture modeling and diagramming around the C4 model. [Compare](https://toolgpa.com/compare/icepanel-vs-structurizr)
- [PlantUML](https://toolgpa.com/tools/plantuml): Draw UML and other diagrams from plain-text descriptions. [Compare](https://toolgpa.com/compare/plantuml-vs-structurizr)
- [Mermaid](https://toolgpa.com/tools/mermaid): Text-based diagramming platform with AI and a visual editor. [Compare](https://toolgpa.com/compare/mermaid-vs-structurizr)
- [draw.io](https://toolgpa.com/tools/draw-io): Free diagram editor that saves files to storage you choose. [Compare](https://toolgpa.com/compare/draw-io-vs-structurizr)
- [Cloudcraft](https://toolgpa.com/tools/cloudcraft): Live cloud architecture diagrams, included with Datadog. [Compare](https://toolgpa.com/compare/cloudcraft-vs-structurizr)

## Sources

The prices, plans, platforms and features above were read from these pages on Nov 13, 2026:

- https://structurizr.com/
- https://docs.structurizr.com/server/pricing

Page: https://toolgpa.com/tools/structurizr
Listed by ToolGPA (toolgpa.com).