A software architecture diagram is usually out of date the moment someone finishes drawing it in a general-purpose tool like Miro or draw.io — nobody remembers to update it after the next refactor. LikeC4 and IcePanel both fix that by building on the C4 model, a standard way of describing how software systems fit together, but they solve the staleness problem in opposite ways: LikeC4 generates diagrams from text you keep in Git, so the diagram can't drift from the description; IcePanel gives a whole team a live, drillable map they edit and propose changes to together, closer to a shared wiki than a text file.
The short version
| LikeC4 | IcePanel | |
|---|---|---|
| Format | Text (DSL) → auto-generated diagram | Interactive, drillable visual map |
| Pricing | Free, fully open source (MIT) | Freemium: free up to 5 editors, then $40–80/editor/month |
| Best for | Teams already documenting architecture as versioned text in Git | Architects communicating systems across engineering and leadership |
| Collaboration | Normal Git workflow (pull requests) | Visual fork/merge workflow to propose changes |
| Standout feature | VS Code extension and web playground, nothing to install to try it | Multiple views tailored by audience (engineers vs. leadership) |
| Notable users | 5,100 GitHub stars | Cambridge, Cisco, BMW, Alphabet |
LikeC4 — free, and the diagram is generated from the same text your team already versions
LikeC4 lets you describe your software's architecture as simple text, then automatically turns it into clean, professional diagrams based on the C4 model — so the diagram always matches the description instead of drifting out of sync. It ships with a VS Code extension and a web playground, so you can try it without installing anything.
Who it's for: engineering teams that already document architecture as text in Git and want diagrams generated automatically rather than drawn and maintained by hand.
Pricing: Free and fully open source (MIT license), no paid tier at all.
Honest limits: there's no visual fork/merge collaboration workflow like IcePanel's, it's built for developers (text plus CLI) so it's less approachable for non-technical stakeholders, its community is smaller (5,100 stars), and it requires learning the DSL's modeling syntax.
IcePanel — a shared, drillable map built for architects and the people they report to
IcePanel gives a company a shared, interactive map of how its software systems fit together — instead of a static diagram that's outdated the moment someone draws it, teams can drill down from a big-picture view into individual services, with different views built for different audiences, and a fork/merge workflow for proposing architecture changes.
Who it's for: software and solution architects who need to document systems and communicate them to different audiences — engineers who need every detail, and leadership who need the big picture.
Pricing: Freemium. Free for up to 5 editors and 100 model objects; Growth is $40/editor/month billed annually; Scale is $80/editor/month with a 20-editor minimum; Enterprise is on request. There's a 14-day trial on the Growth plan.
Honest limits: per-editor pricing gets expensive fast for a mid-sized team, the Scale plan's 20-editor minimum is a real barrier, and it's more overhead than a general-purpose diagramming tool for a one-off diagram.
Pick LikeC4 if…
…your team already lives in Git, wants architecture diagrams that can never drift from the text description, and doesn't want to pay anything for it.
Pick IcePanel if…
…you need to communicate architecture to non-engineers too, want a visual fork/merge workflow for proposing changes, and the per-editor pricing fits your team's size and budget.
The dividing line isn't really features — it's who else needs to read the diagram. If it's just your engineering team working in Git, LikeC4's free text-to-diagram approach wins on cost and staleness alone. If leadership or other departments need a view they can click through without touching code, IcePanel's paid collaborative map earns its price.