What is Appspace

Appspace is a modular web framework for building IDE-like applications. It provides:

• App layer — You define an app by its id, name, version, and the set of extensions it uses. The framework handles registration, lifecycle, and rendering.
• Extension system — Features (editor, terminal, AI, settings, etc.) are packaged as extensions. Each extension registers with the core and can contribute UI and commands.
• Contributions — Declarative UI: tabs in sidebars, buttons on toolbars, HTML blocks. Contributions are bound to targets (e.g. main sidebar, bottom panel).
• Commands — Named actions with handlers. Toolbars and menus reference commands; the command palette and AI can execute them.
• Core services — Workspace, settings, dialogs, tasks, events, and dependency injection.

You can build a downstream app by defining an AppDefinition and choosing which extensions to enable, or author new extensions that register with extensionRegistry, contributionRegistry, and commandRegistry.

See Architecture and the Guide for details.