C4 modeling that stays connected

Model your architecture once. Keep every C4 view connected.

Create context, container, and component views from the same reusable elements. Update the model once, navigate from the big picture to detail, and give your team architecture they can trust.

Create your free model Explore the live model

Free for 1 user and up to 400 architecture items · No credit card required

One model behind every context, container, and component view.

UxxU C4 diagram editor showing connected software systems and actors

UxxU project workspace showing recent and project C4 diagrams

UxxU object model listing reusable software architecture elements

UxxU diagram map showing linked software architecture diagrams

UxxU project versioning interface showing architecture branch lineage and merge controls

UxxU architecture analytics showing technology lifecycle and exposure

Purpose-built C4 canvas

Model systems and relationships in one workspace.

Create architecture elements, connect dependencies, document intent, and arrange every view on a canvas designed for software architecture.

Stop redrawing the same architecture

One system should not become five disconnected diagrams.

Traditional diagramming tools store shapes on separate canvases. UxxU stores the systems, containers, components, people, and relationships themselves. Each diagram becomes a view of the same architecture model.

The disconnected workflow

Copy the same system into every diagram
Rename and reconnect it in several places
Search for the file people currently trust
Explain manually how one view relates to the next

The UxxU workflow

Model each architecture element once
Reuse it across context, container, and component views
Navigate directly from overview to detail
Give every teammate the same current model

From system landscape to implementation detail

Build a model your team can navigate

Start with what exists, create only the views people need, and keep every level connected as the architecture evolves.

01
Capture the system
Add the people, software systems, containers, components, stores, and relationships that make up your architecture.
02
Create focused views
Reuse those elements to explain the system at context, container, and component level without drawing them again.
03
Navigate and evolve
Drill from overview to detail, then update the shared model as the architecture changes.

Explore a connected model before signing up

Click through the architecture your team could navigate

Pan and zoom, then open a linked element to move from context to detail. You are using a live UxxU model, not watching a scripted demo.

Keep architecture in the work

Make the model useful after the meeting ends

Use the same source to design changes, review dependencies, explain decisions, onboard teammates, and give AI better context.

Answers without the diagram hunt

Move from the system landscape into the detail that matters without searching folders, wikis, or old messages.

Faster technical conversations

Give architects, engineers, product teams, and new starters the same current context before decisions are made.

Architecture AI can reason about

Give AI workflows structured systems, technologies, and relationships instead of asking them to interpret a flattened image.

Architecture versioning

Branch the architecture without interrupting the work

Explore architecture changes on an isolated project branch while UxxU continues saving automatically. Switch between versions and merge diagrams and model elements back when the change is ready.

Start every project on a main branch
See where each branch came from and who created it
Merge changes with conflict handling for diagrams and elements

Create a versioned project

Project branches

Branch lineage and ownership

Auto-saved

mainDefaultCurrent

Root branchProject owner

checkout-redesign

Branched from mainProduct team

payment-boundary

Branched from checkout-redesignPayments team

observability

Branched from mainPlatform team

Merge checkout-redesign into main

Conflict-aware merge

Uxxu MCP

Your AI assistant. Your architecture. One connected model.

Connect Claude Code, Codex, Cursor, or VS Code to your Uxxu workspace through the Model Context Protocol. Ask your assistant to create and update C4 diagrams, then review and refine the editable model with your team.

Claude Code

CodexCursor & VS Code

Connect your AI assistant Explore Uxxu MCP

Hosted endpoint. Organisation API key. No local MCP server to run.

Uxxu diagram map showing connected architecture views and their drill-down relationships — Connected views in Uxxu, not a static image left in a chat.

Create a connected model

Turn a brief or code your assistant can access into context, container, and component views.

Work with what exists

Read your project, reuse its elements, and update diagrams as your architecture changes.

Explore on a branch

Ask your assistant to create a project branch for a proposed change before merging it back.

Start with a real architecture

Build something useful before you pay

Model one of your systems, create its connected views, and let your team explore the result. Upgrade only when you need more than the free plan.

Create your free model Compare plans

Free plan

Everything needed to test the workflow

€0

1 user and up to 400 architecture items
No credit card required
Secure hosted workspace

Need more capacity?

Add exactly the paid seats you need

€12

per seat / month

Questions before you start

Clear answers, no sales call required

For security, privacy, or procurement questions, visit our Security page or contact info@uxxu.io.

How is UxxU different from draw.io, Miro, or Lucidchart?

General diagramming tools store drawings. UxxU stores architecture elements and relationships, then lets you reuse them across connected C4 views. The result is a navigable model instead of a folder of unrelated canvases.

Which C4 levels can I model?

UxxU supports system context, container, and component diagrams, with linked navigation between levels.

Can I try UxxU without entering payment details?

Yes. Every organization includes a free plan for one user with up to 400 architecture items, and no credit card is required.

Can a team work from the same architecture model?

Yes. UxxU provides shared workspaces and collaborative editing so a team can evolve the same model instead of maintaining separate copies.

Does UxxU support architecture versioning?

Yes. Projects start on a main branch and can have separate architecture branches that save automatically. UxxU shows branch ancestry and creator information, supports branch switching, and can merge diagrams and model elements with conflict handling.

How does UxxU protect customer data?

UxxU uses encrypted AWS infrastructure, secure authentication, encryption at rest for RDS and S3, and documented operational controls. Full details are available on the Security page.

codeToC4 beta

Turn your repository into a C4 starting point

Generate context, container, and component views from your codebase, then refine the result in UxxU. Start with the architecture already present in the code instead of an empty canvas.

Explore codeToC4 See how it works

Discover the current structure

Use the repository as evidence for the systems, containers, components, and dependencies already in place.

Follow architecture through Git

Connect architecture work to commits, branches, and releases as the codebase changes.

Continue in the UxxU model

Review the generated views, add missing context, and keep the result connected to the rest of the architecture.

Embeddable diagrams

Put current architecture where people already work

Embed a live UxxU diagram in product documentation, engineering handbooks, technical articles, and websites. Update the model once instead of replacing screenshots everywhere.

Read the embed guide

Works with