Products
What Quiet Grid Labs ships
Our own products, built with the same care we bring to every project. Explore architecture with Viaduct, keep the whole model on your own machine with Viaduct Desktop, and connect your AI agents with Viaduct MCP.
Viaduct
Live
C4 architecture modelling in the browser
One C4 model as the navigation layer for a system: context, containers, components and code, with the Markdown, sequences, ER models and API contracts attached to the elements they describe.
- All four C4 levels on one canvas
- Markdown, PlantUML sequences and ER models on the node
- Live collaboration and an MCP server for Cursor
Viaduct Desktop
Live
The same editor, on your own machine
The whole editor as a native app for macOS, Windows and Linux — all four C4 levels, Magic flows, docs, sequences and contracts, with an MCP server on localhost so Cursor and Claude Code read the same model. Projects are plain JSON files in a folder you choose.
- Free for 7 days on each machine, then €10 a month
- MCP server built in, on 127.0.0.1
- Projects are JSON files you own; one licence covers 3 machines
Viaduct Community
Live
Local C4 architecture editor — open-core
Design, explore and document architecture with the C4 model, Magic flows, docs and contracts. Runs locally in the browser. No account. The Community edition of Viaduct by Quiet Grid Labs.
- All four C4 levels, Magic flows and docs
- Browser persistence with JSON import/export
- BUSL-1.1 open-core — runs fully offline
Viaduct MCP
Live
MCP server exposing C4 models to AI coding agents
A Model Context Protocol server that gives Cursor, Claude Code and Claude Desktop direct read and write access to a Viaduct architecture model — C4 elements, PlantUML sequences and data flows — over bearer-token auth.
- 29 tools spanning model reads and writes
- Bearer-token auth with per-caller authorization
- HTTP and stdio transports, Docker deployment
Nothing else announced yet
The lab starts a new tool only when the last one is genuinely carrying its weight. If you have a problem in this space that keeps costing your team a day a week, we would like to hear about it.