Lucid Train compared with Structurizr.
Structurizr asks you to maintain a model. Lucid Train reads the code instead.
Lucid Train derives architecture diagrams from your codebase each time, so there is no separate model to write or keep current. Structurizr is model-driven: you describe the system once in its DSL and every view is generated from that model, which guarantees the views agree but requires ongoing maintenance. Lucid Train also runs locally against your own models and can turn a diagram into a coding specification.
No DSL, no model to keep current
Structurizr requires you to write and maintain the architecture in its DSL, and that is where most adoptions quietly fail: the model is written during an initiative and drifts once attention moves elsewhere, at which point it is confidently wrong. Lucid Train regenerates from the code, so the maintenance burden is a command rather than a discipline.
C4 without adopting a toolchain
Lucid Train draws C4 context and container views from your repository, alongside data flow, sequence, entity and infrastructure diagrams, without requiring you to commit to a modelling method first. For a team that wants C4's clarity but will not sustain a formal model, that is the practical route to it.
Local, offline, and connected to the code
It runs as a desktop app against local models with nothing leaving the machine, reads the actual repository, and converts the finished diagram into a markdown specification that starts a coding turn. Structurizr models the system; Lucid Train reads it and can act on it.
What Structurizr is good at
Model-driven is a genuinely better idea when someone owns it: describe the system once and every view derives from it, so the views cannot contradict each other. It comes from Simon Brown, who defined C4, so the C4 support is authoritative rather than approximate.
Side by side
| Lucid Train | Structurizr | |
|---|---|---|
| Generates from a codebase | Yes | No, you write the model |
| Requires learning a DSL | No | Yes |
| Maintenance burden | Regenerate | Maintain the model |
| Diagram types | C4, data flow, sequence, ER, infra | C4 |
| Real service icons | Yes, bundled | Limited |
| Diagram to code as a specification | Yes | No |
| Runs fully offline with local models | Yes | Lite is self-hosted, no AI |
| Version history | 50 versions per diagram | Via your VCS |
| Price | CLI free and open source; desktop $3/month, 7-day trial, no card | Lite free; cloud paid |
Questions
Can Lucid Train produce a Structurizr DSL?
The agent will write DSL if you ask, which is a reasonable way to bootstrap a model from an existing codebase. It is not a supported round trip.
Do I need to learn a DSL to use Lucid Train?
No. Point it at the repository or describe the system in prose. The semantic graph it produces is editable directly if you want to work with it.
Which is better for C4?
Structurizr is C4-native and authoritative if you will maintain the model. Lucid Train draws C4 levels from your code with no model to maintain, which is what most teams will actually sustain.
Affiliation
Lucid Train is an independent product and is not affiliated with, endorsed by, or connected to the product described on this page. All names and trademarks belong to their respective owners. Pricing and features were checked on 19 August 2026 and change without notice; check the vendor's own site before deciding.
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