Diagram Guru

AI-Powered C4 Architecture Diagrams for Engineering Teams

No more A.I. slop. Design systems that live alongside your code.

DiagramGuru is the system design platform where AI agents model, visualize, and evolve your C4 architecture. You approve the changes. Your team and AI Agents get the same visibility.

$ Create a C4 architecture for our e-commerce platform with order processing, payments, and notifications

✓Created Container drill-down (7 containers)

System design shouldn't be a static artifact.

Most teams draw their architecture once, then guess their way through every change. Outdated diagrams lead to wrong assumptions, bad decisions, and costly rewrites. DiagramGuru makes system design a living, collaborative process — from first sketch to deployed system.

Built for engineering teams that design, build, and evolve real systems.

Describe your system in natural language. AI agents model C4 entities, relationships, and flows — from system context down to code level.

Interactive diagram editor with 4-level drill-down. Navigate System Context to Containers to Components to Code — all in one canvas.

Color-coded sequences that trace every request, event, and data path through your system. See how it behaves, not just how it's structured.

Every diagram is an MCP resource. Any AI agent can read, model, and evolve your architecture programmatically via the Model Context Protocol.

Role-based access at org, team, and project level. Full audit log of every change. SSO and custom roles for Scale and Enterprise plans.

Flows overlay your C4 diagrams with numbered, color-coded sequences that show exactly how data moves through your system for each use case — from placing an order to browsing a catalog.

From a prompt to a modeled architecture in minutes.

Tell your AI agent what you're building — services, databases, queues, integrations. Natural language is all it takes to start modeling.

The agent creates entities, relationships, and flows via MCP. Your full C4 model — from Context to Code — takes shape in seconds.

Tweak layouts, update styles, drill into any level, add code-level details. The interactive canvas gives you full control over every element.

Start designing free, upgrade when you grow.

Start modelling free. Perfect for small teams and solo developers.

- C4 Diagrams
- MCP Integration
- Flows
- AI-Powered Design

Designed for teams that need to collaborate on complex, large-scale designs.

Built for organizations to manage and scale design collaboration across multiple teams.

- Editors20
- Viewers100
- Projects100
- Teams20

- Everything in Growth, plus:
- Domain Restriction
- Priority Support

Custom solutions for large organizations with robust security and controls.

- EditorsCustom
- ViewersCustom
- ProjectsCustom
- TeamsCustom

- Everything in Scale, plus:
- Custom Roles / Permissions
- Dedicated Support

Your AI Tools. Your Architecture. No Lock-in.

DiagramGuru works with any MCP-compatible agent — Claude, GPT, Codex, Copilot. Bring your existing AI subscriptions and API keys. Your agent connects through a standard MCP interface to read, model, and evolve your architecture. No separate per-token bill, no locked-in ecosystem.

MCP NativeBYOKClaudeCodexCopilotNo Lock-in

Everything you need to know about DiagramGuru and AI architecture diagrams.

DiagramGuru is an AI-powered software architecture diagram tool for engineering teams. It lets your AI agent (Claude, ChatGPT, Copilot, etc.) model your system as a C4 architecture diagram — from System Context to Containers to Components to Code — through a standard MCP (Model Context Protocol) interface. You get a live, interactive canvas to review, edit, and share.

The C4 model is a lean, hierarchical framework for visualizing software architecture, created by Simon Brown. It uses four levels of abstraction: System Context (how your system fits in the world), Containers (applications and data stores), Components (inside a container), and Code (classes and functions). DiagramGuru supports all four levels in a single interactive workspace.

How does DiagramGuru use AI to create architecture diagrams?

DiagramGuru exposes your architecture workspace as an MCP resource. You describe your system in natural language to any MCP-compatible AI agent — "model our e-commerce platform with order processing, payments, and notifications" — and the agent creates entities, relationships, and flow diagrams via the MCP API. The full C4 model takes shape in seconds, and you approve every change.

What is the Model Context Protocol (MCP)?

The Model Context Protocol (MCP) is an open standard that lets AI agents read and write structured data in external tools. DiagramGuru is MCP-native: every diagram and project is an MCP resource. Any AI agent that supports MCP — Claude, GPT, Codex, Copilot — can connect to DiagramGuru without custom integrations.

Does DiagramGuru work with Claude, ChatGPT, and GitHub Copilot?

Yes. DiagramGuru works with any MCP-compatible AI agent, including Claude (Anthropic), GPT and Codex (OpenAI), and GitHub Copilot. Bring your own API keys (BYOK) — there is no per-token bill from DiagramGuru, and no locked-in AI ecosystem.

DiagramGuru has a free tier that lets you start designing with no credit card required. Paid plans (Pro, Scale, Enterprise) unlock more editors, projects, teams, and enterprise features like SSO and audit logs. See the pricing section for full details.

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