The ultimate genui is HTML

[taosimple]

In fact, I think the best genui in the AI era already exists, which is web HTML. For example, to generate an echart chart in a chat list, you can just embed it into the ListView using WebView. AI has a strong ability to generate html code, rather than teaching AI again how to use json to generate UI. However, Flutter's WebView is currently too simplistic and is not supported by many platforms. Therefore, I believe the top priority is to improve the WebView functionality and provide an efficient WebView component.

[jacobsimionato]

We completely agree that HTML is a great Gen UI format, and it's got plenty of traction in the industry e.g. MCP-UI, Gemini Dynamic View etc.

We think that the different approaches each have use cases where they make sense. Some advantages of the higher-level declarative Gen UI formats like A2UI or Open-JSON-UI (which seems to be coming soon?) are:

• Client can have consistent styling across Gen UI content
• Native look and feel
• Lower resource usage
• Simpler information-oriented format is easier for other LLMs (e.g. an orchestrator in a multi-agent system) to read or modify. A huge payload of HTML, CSS, JS etc is unwieldy to work with.
• Not constrained visually to an iframe/webview, e.g. a Gen UI element could trigger a pop-up sheet

CopilotKit have some great docs on this here: https://docs.copilotkit.ai/generative-ui-specs