Software Architecture Platform for C4 Models
Design. Understand. Evolve Your Architecture
Uxxu helps teams model systems, containers, components, and dependencies in one shared workspace. Track technologies, connect diagrams, and evolve architecture over time.
Free plan up to 100 items · No credit card required
Connected C4 Architecture
Create C4 diagrams that link together into a navigable architecture model. Navigate from Context diagrams to Container diagrams to explore how your systems are structured.
Collaborate in real time
Design and evolve architecture together using a shared, collaborative workspace. Real-time diagram editing, shared architecture workspaces, and organization-wide visibility ensure everyone works from the same source
Analyze your Architecture
Turn architecture diagrams into insights. Uxxu analyzes your architecture model to reveal complexity, dependencies, and potential risks such as single points of failure, helping teams understand and improve system design.
LLM Diagramming
Teach your LLM to create a C4 model from a specification
Uxxu ships with an MCP server so Claude Code, Codex, OpenClaw, and other MCP-capable clients can connect directly to your Uxxu workspace. Give your model a specification, let it create the C4 model and diagram, and keep the result inside Uxxu instead of in a throwaway image.
Works with
Connect
Install `uxxu-mcp`, add your API key, and register it with Claude Code, Codex, or OpenClaw.
Instruct
Teach the model your C4 rules so it can turn a written specification into system context, container, or component views.
Create
Uxxu handles layout, connector choice, technology matching, and stores the finished C4 diagram in your project.
Example Prompt
Use the uxxu MCP. In my Uxxu project "Architecture Demo", create a C4 container diagram for a healthcare patient portal with a web portal, mobile app, API gateway, messaging service, EHR integration, audit logging, and notification delivery.What Uxxu handles automatically
- ELK layout before import
- best connector matching for links
- technology matching against the Uxxu catalog
- viewer links back to the created diagram
New Beta: codeToC4
Turn your repository into living C4 diagrams
codeToC4 reads your repository and generates context, container, and component diagrams automatically. It is built for teams that want architecture documentation to keep pace with Git, branches, and AI-assisted development.
Why it matters
- Automatic C4 generation from code
- Architecture by commit, branch, or release
- Visual architecture diffs for pull requests
- Built directly on the Uxxu C4 platform
Embeddable Diagrams
Put Uxxu diagrams inside Notion, Medium, websites, and more
Uxxu diagrams are not trapped inside the app. You can embed them in product docs, technical guides, blog posts, internal wikis, and public websites while keeping one shared source of truth.
Works well in
Great for websites built with
One source
Update the diagram once in Uxxu and keep the embedded version in sync everywhere it appears.
Docs-ready
Use the same architecture model in product documentation, engineering handbooks, tutorials, and blog posts.
Public or private
Share diagrams on public websites or keep them inside internal workspaces where architecture still needs to stay visible.
Give it a Go!
This is a live Uxxu embed. The same kind of diagram can sit inside a website, a Medium post, a Notion page, or the rest of your documentation stack.
Quick Answer
What Uxxu helps teams do
This is the short version for readers and AI systems that want the core message first.
- Replace disconnected diagram files with a connected C4 architecture model your whole team can navigate — unlike draw.io or Miro where diagrams are isolated images.
- Architecture elements (systems, containers, actors, dependencies) are reusable across diagrams: change once, updated everywhere. Generic tools make you redraw the same box in every diagram.
- Teams go from zero to their first navigable C4 context diagram in under 30 minutes. Free plan up to 100 items, no credit card required.
C4 Model Hub
Learn the C4 model with one connected reading path
We pulled the main C4 guide together with the practical Context, Container, Deployment, and AI workflow articles into one hub. If you want the clearest path through our C4 content, start there.
In the hub
- The full C4 model guide
- System Context deep dive
- Container diagram practical guide
- Deployment diagram practical guide
- How to teach LLMs to use C4 with Uxxu
Architecture knowledge is fragmented
Most software teams document architecture using a mix of diagrams, documents, and wikis.
Over time this creates problems:
- Architecture diagrams that are not linked together
- Documentation that quickly becomes outdated
- Teams working in isolation
- Difficult onboarding for new engineers
- Limited visibility into system dependencies
Architecture knowledge becomes scattered across tools and teams, creating silos and making it harder to understand how the system actually works.
Uxxu keeps your architecture connected
Instead of isolated diagrams, Uxxu creates a living architecture model where everything is linked.
With Uxxu you can:
- Create C4 diagrams and deployment diagrams
- Organize architecture into projects and organizations
- Define systems, actors, applications, stores, and domain objects
- Link diagrams together and drill down into deeper architecture levels
- Attach documentation and technology information
- Annotate relationships between architecture elements
Your architecture becomes navigable, structured, and shared across teams.
See it in action
The C4 Model for Software Architecture
The C4 model is a simple and structured way to describe software architecture using a small set of diagrams that show different levels of detail. It helps teams understand systems from a high-level overview down to the individual components that make them work. Uxxu supports the full C4 model, allowing you to navigate architecture from the big picture to the technical implementation.Here are the diagrams that UxxU can help you with.
Context Diagram
Shows the system from a high-level perspective and how it interacts with users and external systems. It helps stakeholders understand what the system does and how it fits into the larger environment.
Container Diagram
Zooms into the system and shows the main applications or services such as web apps, APIs, and databases. It explains how the system is structured internally and how its main parts communicate.
Component Diagram
Provides a deeper view inside a container, showing the main components or modules that implement the functionality. It helps developers understand how the code is organized.
Deployment Diagram
Shows how the system is deployed across infrastructure such as servers, containers, and cloud services, helping teams understand how the software runs in production.
How UxxU Works?
What teams say
Teams that replaced scattered diagrams with a connected architecture model
“We used to maintain C4 diagrams in Confluence as static images. Every sprint review someone would ask 'is this still accurate?' With Uxxu the diagrams are connected to the actual model, so when we update a container the context diagram reflects it. Onboarding a new engineer now takes half the time it used to.”
Prakash Sharma
Senior Technical Director · TSYS
“That navigation is what sold us. Drill from context into containers and it just works.”
Sarah M.
Principal Software Architect · Fintech scale-up
“I was skeptical about another diagramming tool but the dependency analytics changed my mind. We found three circular dependencies and a hidden single point of failure in the first week. No other tool gave us that kind of structural insight without custom scripts.”
Daniel R.
Staff Engineer · SaaS platform, 80-person eng team
“We share a Uxxu link before every RFC now. The review conversation starts from a shared source of truth instead of everyone showing up with a different diagram.”
Maya K.
Engineering Manager · Healthtech startup
“As a CTO I need to explain our architecture to investors, new hires, and the board — each at a very different level of detail. Uxxu's zoom model maps perfectly to that. I show the landscape to the board, the context diagram to product leads, and the container view to engineers. One tool, three audiences.”
Tom B.
CTO · B2B SaaS, Series B
“Clients actually understand their own architecture now. Before Uxxu every engagement ended with a different format — Visio, draw.io, PowerPoint. Now everyone gets the same C4 model.”
Ling W.
Solutions Architect · Independent consultant
“The component-level dependency tracking turned our tech debt conversations from gut feeling into structured arguments. I can point to a specific container, show its lifecycle status and inbound dependencies, and make the refactoring case in five minutes instead of forty-five.”
Alex P.
Tech Lead · E-commerce platform
“Our on-call runbooks now link to Uxxu diagrams instead of outdated wiki screenshots. That alone made it worth it.”
Rui F.
Senior Data Engineer · Data platform team
“I have tried to get teams to adopt architecture documentation at four different companies. The usual story: someone draws diagrams, they go stale, nobody trusts them, they stop being updated. Uxxu is the first tool where the diagrams stayed alive past the first quarter because they are connected to a real model, not saved as image files in a wiki.”
Jamie O.
VP of Engineering · Enterprise software
“When an engineer asks our AI coding agent about system structure it now gets the right answer because the agent reads from our live Uxxu model via MCP. That closed a loop we had been chasing for over a year.”
Chris D.
Staff Architect · Media technology company
“We used to maintain C4 diagrams in Confluence as static images. Every sprint review someone would ask 'is this still accurate?' With Uxxu the diagrams are connected to the actual model, so when we update a container the context diagram reflects it. Onboarding a new engineer now takes half the time it used to.”
Prakash Sharma
Senior Technical Director · TSYS
“That navigation is what sold us. Drill from context into containers and it just works.”
Sarah M.
Principal Software Architect · Fintech scale-up
“I was skeptical about another diagramming tool but the dependency analytics changed my mind. We found three circular dependencies and a hidden single point of failure in the first week. No other tool gave us that kind of structural insight without custom scripts.”
Daniel R.
Staff Engineer · SaaS platform, 80-person eng team
“We share a Uxxu link before every RFC now. The review conversation starts from a shared source of truth instead of everyone showing up with a different diagram.”
Maya K.
Engineering Manager · Healthtech startup
“As a CTO I need to explain our architecture to investors, new hires, and the board — each at a very different level of detail. Uxxu's zoom model maps perfectly to that. I show the landscape to the board, the context diagram to product leads, and the container view to engineers. One tool, three audiences.”
Tom B.
CTO · B2B SaaS, Series B
“Clients actually understand their own architecture now. Before Uxxu every engagement ended with a different format — Visio, draw.io, PowerPoint. Now everyone gets the same C4 model.”
Ling W.
Solutions Architect · Independent consultant
“The component-level dependency tracking turned our tech debt conversations from gut feeling into structured arguments. I can point to a specific container, show its lifecycle status and inbound dependencies, and make the refactoring case in five minutes instead of forty-five.”
Alex P.
Tech Lead · E-commerce platform
“Our on-call runbooks now link to Uxxu diagrams instead of outdated wiki screenshots. That alone made it worth it.”
Rui F.
Senior Data Engineer · Data platform team
“I have tried to get teams to adopt architecture documentation at four different companies. The usual story: someone draws diagrams, they go stale, nobody trusts them, they stop being updated. Uxxu is the first tool where the diagrams stayed alive past the first quarter because they are connected to a real model, not saved as image files in a wiki.”
Jamie O.
VP of Engineering · Enterprise software
“When an engineer asks our AI coding agent about system structure it now gets the right answer because the agent reads from our live Uxxu model via MCP. That closed a loop we had been chasing for over a year.”
Chris D.
Staff Architect · Media technology company
100+
items on free plan
No CC
required to start
C4-native
not a generic canvas
Why Teams Choose Uxxu
Purpose-Built for C4
Unlike general diagramming tools, Uxxu is designed specifically for software architecture. Architecture elements — systems, containers, components, actors — are first-class entities with defined relationships, not just boxes and arrows.
Navigable Architecture
Drill down from a system context view into container and component detail, then navigate back up. Teams always know where they are in the architecture. No more hunting through disconnected files and folders to understand a system.
Living Documentation
Architecture diagrams that evolve with the software rather than becoming outdated artifacts. Track technology lifecycle status, manage dependencies, and generate analytics that help teams understand how complexity is growing over time.
Architecture work needs more than a diagramming canvas
Most teams already draw diagrams. The problem is that the diagrams stop being useful too quickly.
- Whiteboard sketches disappear after the meeting.
- Static files drift away from the real system.
- Teams lose the shared language they need for architecture work.
Uxxu treats systems, containers, components, stores, actors, and relationships as architecture concepts, not just shapes. That makes it easier to move between levels, keep structure coherent, and use the same model in design, review, onboarding, and AI workflows.
The goal is simple: make diagrams stay useful after the meeting ends.
From the Blog
Architecture insights, C4 model guides, and team collaboration tips.
The Definitive Guide to the C4 Model
A reference-grade guide to understanding and applying the C4 Model for software architecture diagrams.
Uxxu vs Draw.io: From Static Diagrams to Living Architecture
Why generic diagram tools fail as architecture documentation and how Uxxu turns C4 diagrams into living system documentation.
Uxxu vs Structurizr: DSL to Navigable Architecture
Why architecture navigation, drill-down views, and living documentation matter beyond C4 diagram generation.