The best C4 tool is the one your team can keep accurate. A polished first diagram tells you less than the tenth change to a shared service. Evaluate a tool with two views, a dependency change and a colleague who has never seen the architecture.
This guide is published by UXXU. It is an evaluation framework, not an independent ranking. Vendor descriptions were reviewed on October 1, 2026; follow the sources for current capabilities.
Shortlist by authoring workflow
| Tool | Workflow worth evaluating | Primary source |
|---|---|---|
| UXXU | Visual modeling, shared elements, collaboration and MCP | Product walkthrough |
| Structurizr | A DSL model rendered into multiple C4 views | Structurizr |
| IcePanel | Visual modeling and message-flow walkthroughs | IcePanel |
| LikeC4 | Architecture definitions in Git with interactive publishing | LikeC4 |
| Draw.io | General-purpose diagram editing with C4 shapes | C4 documentation |
| Archyl | Repository discovery, YAML architecture and drift checks | Archyl |
Do not use “has AI” as the deciding test. Ask which architecture facts the agent can retrieve, how changes are reviewed and how access is scoped. Several tools now offer MCP workflows.
Use the same checkout example in every trial
In this UXXU container example, locate the order path and the asynchronous work that follows it. Write down which services need to succeed before the customer receives an order confirmation. Ask a second reader to repeat the exercise without your explanation.
Download the checkout model specification. It uses Structurizr DSL with context, container and component views. Translate it when a candidate tool uses a different format; do not treat import compatibility as assumed.
Measure maintenance, not just drawing speed
- Build a context view and a container view over the same payment provider.
- Rename that provider. Inspect both views for stale names and descriptions.
- Add a notification worker behind an event broker. Make the synchronous purchase path distinguishable from asynchronous work.
- Share a read-only view in your documentation and have a colleague follow a dependency.
- Propose a change, review it and recover the previous model.
Download the evaluation worksheet for the pass criteria and evidence fields. Use a fresh copy for each tool; leave untested capabilities marked as untested.
Record elapsed time, manual corrections, reader mistakes and any extra infrastructure required. Then calculate the cost for the people who actually need access, including the time spent operating a self-hosted tool.
Decide with a concrete tradeoff
A Git-centered team may prefer text authoring. A mixed architecture workshop may prefer direct visual editing. Repository discovery deserves its own trial against your codebase: generated boundaries and missing integrations need human review.
Use the detailed evaluations for IcePanel, Structurizr, LikeC4, Draw.io and Archyl. Start a UXXU evaluation with the C4 model tool and the current pricing.