Cratis Scene
Cratis Scene is a UI model and runtime for developers building platform-independent, Screenplay-based user interfaces.
Describing a user interface without describing a platform — Scene is the UI model of the Cratis model-first layer.
The object model and runtime for Screenplay-based UIs: Scene.Model (platform-agnostic screens, layouts,
forms, contribution points, ui profiles and themes), Scene.Engine (binding/resolution runtime), and
Scene.React (the React renderer).
Packages / Deployables
.NET support
Cratis.Scene.Model and Cratis.Scene.Engine target .NET 10 and .NET 11. .NET 8 and .NET 9 are no longer supported.
Building from source requires the .NET 11 SDK selected by global.json. Specifications run on .NET 11 by default;
CI also runs both library specification projects on .NET 10.
Builds
Description
Scene owns the object model and runtime half of the Screenplay stack. In the model-first pipeline, Screenplay describes an event-sourced, CQRS system, Stage renders it into a running application, and Scene is how that application's user interface is described — independently of any rendering platform.
Scene.Model is the platform-agnostic
C# object model that Stage translates Screenplay's parsed language constructs into, and that Studio's
design-time tooling reads and writes. Scene.Engine walks that graph, resolves bindings (data, action, form,
navigation contribution) and drives whichever renderer is plugged in — it does not know React exists.
Scene.React is one renderer implementing the abstract vocabulary against real React/DOM; sibling positions
are reserved for future Scene.Native / Scene.Desktop renderers. Vendor and internal component packages
(PrimeReact, internal widget libraries) are adapters plugging into the renderer contract, not part of it.
The design-time editor built on top of this object model lives in Studio, not here — see StudioIssues#156.
Support
Cratis is an open community, and we are glad to help users, teams evaluating the stack, and contributors.
| Channel | Details |
|---|---|
| Discord | Join the community on Discord for questions and discussions |
| GitHub Issues | Report bugs or request features |
| Documentation | Read the docs at cratis.io |
The Cratis ecosystem
This project is part of Cratis — tools for building event-sourced and CQRS applications.
- Chronicle — event-sourcing database and runtime. Orleans-based kernel, pluggable storage (MongoDB default; PostgreSQL, SQL Server, SQLite, in-memory), language-agnostic gRPC contracts. Docs
- Chronicle clients — first-class .NET SDK, plus TypeScript, Kotlin/Java, and Elixir; Python coming soon. AI agents connect through the Chronicle MCP server.
- Arc — opinionated CQRS framework for ASP.NET Core with commands, queries, validation, authorization, and TypeScript proxy generation. Works without event sourcing. Docs
- Components — React components aligned with Arc patterns. Docs
- CLI + Workbench — inspect and diagnose Chronicle from the terminal or the browser. Docs
- Model-first layer — Studio, Screenplay, Stage, Scene (this repository), Prologue
- Supporting — Fundamentals, Specifications, Synopsis, Lens, Narrator, and free AI tooling; Ensemble coming soon
- Samples — runnable event sourcing and CQRS samples for the whole stack
Scene is MIT licensed and free to use.