CopilotKit alternatives for Flutter and the web
Last updated 13 October 2026
CopilotKit is an open-source framework (MIT) for React, Angular, Vue and React Native. Alternatives: Rendel if you need Flutter as well as the web with confirmation and a console included; Flutter GenUI if you want Google's experimental toolkit; Thesys for a hosted generative UI API; the Vercel AI SDK to build it yourself.
How they differ
| Alternative | Platforms | What you build yourself |
|---|---|---|
| Rendel | Flutter (iOS, Android) and any website | Your actions and screens; confirmation, catalog, model and console are included |
| Flutter GenUI | Flutter (alpha) | Your widget catalog, your model connection, actions |
| Thesys OpenUI | React, Vue, Svelte, Angular | Your model, actions and the product around the UI |
| Vercel AI SDK | React, Vue, Svelte, Angular | Rendering, actions, confirmation, governance |
Questions
Is Rendel open source like CopilotKit?
No. The Flutter SDK's source is public under MIT, but the service behind it is hosted.