Lucid Train review
A local-first diagramming tool for developers who work offline.
Reviewed by iTechGuides Editors · Editorial team · Updated Oct 2026
Lucid Train is a local-first coding and diagramming tool for developers and software teams. It analyzes code repositories or design inputs, then generates architecture, system design, sequence, ER, cloud, UML, flowchart, and related diagrams. Its free Rust CLI runs in terminal environments, while the desktop application adds a visual canvas alongside coding-agent, audit, dashboard, and connector features. Local models and offline operation make it suited to architecture work where repository content should stay within a local workflow.
Pricing is split between the free CLI and paid desktop access. The CLI includes local models or own API keys, open-source access, and no account requirement. Desktop plans cost $3 per month with monthly billing or $30 per year with annual billing, and include the native application, Design, Diagram, Audit and Dashboards, local models or own API keys, and use on up to three devices. A seven-day free trial is available, and the published starting price is $2.50 per month billed annually. Model-provider charges are separate. The visual diagram canvas is not part of the free CLI.
Lucid Train fits developer toolchains through Ollama, OpenRouter, OpenAI-compatible endpoints, VS Code, Cursor, Zed, Claude CLI, and Codex CLI. It also connects with Grafana, Prometheus, Loki, and MCP for observability and dependency-related workflows. ELK-based semantic graph layout, diagram-to-code specification conversion, Mermaid-to-Excalidraw conversion, exports, and version history of up to 50 versions per diagram give it a focused repository-to-diagram workflow. Developers who want local, offline generation and terminal access should consider it; teams seeking a browser-based visual canvas without a paid desktop plan should look elsewhere.
Lucid Train pros and cons
- Where it wins
- Free Rust CLI supports local models and needs no account
- Generates architecture, system design, ER, UML, cloud, and sequence diagrams
- Exports SVG, PNG, Markdown, and Excalidraw scenes
- Where it doesn't
- Visual diagram canvas requires a paid desktop plan
- Model-provider charges are separate
- The desktop plan supports up to three devices
Lucid Train fact sheet, pricing and score →
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