Architeeli takes a description of your system — its goals, components, constraints, runtime — and
produces the kind of architecture document a human would write to arc42: every chapter,
every diagram, every cross-reference. Then keeps it in sync as the system evolves.
arc42 is a real structure with twelve chapters, each with its own purpose and its own kind of diagram. Treating it as one big prompt produces a glossy first page and twelve placeholders underneath. Architeeli treats each chapter as its own task, with its own context, its own output shape, and the diagram that belongs to it.
Every one of the twelve arc42 sections — from Introduction and Goals through Quality Requirements to Architecture Decisions — is generated as its own task, with the context of the previous chapters and the role that chapter plays in the document.
Container, component, sequence, deployment, context — generated as code (Mermaid, PlantUML, C4-DSL), not as flat images. Embedded in the chapter where they belong, edited in the same editor as the prose, rendered live in the browser.
When the system changes, you regenerate one chapter or one diagram. The rest of the document stays put. No "ChatGPT just rewrote section 4 in a slightly different style than section 5" — Architeeli re-uses the same chapter template, the same glossary, the same decisions.
Paste a brief, point at a repo, or fill in the structured editor: goals, stakeholders, building blocks, runtime, constraints. Architeeli builds a single source of truth about the system before writing anything.
The model fills each arc42 chapter one at a time and emits the diagrams that belong with it. Streamed in the browser — you watch sections appear, diagrams render live, decisions get cross-referenced into the chapters that need them.
Edit any chapter or diagram in place; regenerate one without disturbing the rest. Export as Markdown, PDF, or a published web doc on your own subdomain. Share a read-only link with the rest of the team.
Architecture documents that ship without diagrams aren't architecture documents. Architeeli emits every diagram as text so you can re-run, version, diff, and edit it like code — but always rendered inline, in the chapter where it belongs.
Generated as C4-DSL and rendered through Structurizr-style notation. Level 1, 2 and 3 of the C4 model, with the right amount of detail for each arc42 chapter.
Mermaid sequence and flow diagrams for runtime scenarios — emitted into the Runtime View chapter, one per scenario, with the right actors named from the building block view.
PlantUML deployment diagrams for the Deployment View — environments, nodes, artifacts, network boundaries. Re-runnable when the infra changes without touching the rest of the doc.
Architeeli is a hosted app — the model, the editor, the renderer and your documents all live on
app.architeeli.com. Sign up, generate a real arc42 document on day one, decide on day
fourteen.
Need on-prem, SSO, or a private model? hello@architeeli.com.
14-day free trial. Full access. No credit card. Generate a real arc42 document on day one.