Features
What Cairn does, shown in the app.
Every picture here is the real workspace on the rover template. Each page says what a part of Cairn does and how you use it, and the demo lets you try it with no account.
Start a model
From a description to a first model you chose.
The interviewDescribe what you're building and Cairn interviews you in short rounds, on a phone or a computer, then builds a first model you choose part by part.

System decompositionBreak a system into subsystems, assemblies and parts with AI. Each proposal opens in Change Review, with its reasoning, before anything joins the model.

Shape the design
Structure, behavior and the decisions behind them.
Architecture and interfacesSee a system's parts and every interface between them three ways: a block diagram, an N² chart and an interface list with signals, all from one model.

Behavior and state machinesModel how a system behaves: states, transitions, guards and actions, laid out from the initial state, checked for dead ends and stepped through by hand.

Design decisionsKeep the alternatives a design set aside, why each lost and the first principle that decided it, from physics first to what fits inside the envelope.

Requirements and proof
What it must do, how you will know, and what is missing.
RequirementsGenerate requirements from the system model, with rationale, acceptance criteria and verification, checked for wording and reviewed before they join.

TraceabilityTrace every requirement to the parts that satisfy it, the requirement it derives from and the activity that verifies it, and see the gaps at a glance.

Verification matrixPlan how each requirement will be verified, by inspection, analysis, demonstration or test, and see what has passed, what is failing and what is missing.

Completeness checksSee what a systems model is missing, node by node: what it is, what it does, how it connects and how you'll know, each gap leading to the lens that fixes it.

Trust and ownership
Every change reviewed and kept, and every file yours.
Change Review and HistoryEvery change to the model is a ChangeSet: the AI's reviewed before it applies, yours checked by the same guard, all kept in History and undoable.

ExportsTake your model anywhere: a full project archive with history and assets, model data as JSON, Markdown or CSV, diagrams as PNG or SVG, and written reports.
