Rendel vs Flutter GenUI: a production SDK, or an experimental toolkit to build on
Flutter GenUI facts read on 12 October 2026 from Flutter GenUI’s own pages, rechecked every 90 days
Choose GenUI if you want to experiment with generative UI in Flutter on your own model and widget catalog, and can follow an alpha API. Choose Rendel if you want a working in-app assistant now, with actions, confirmation and a console included.
Side by side
- Status
- RendelShipping; versioned releases
- Flutter GenUIExperimental, in alpha; being redesigned into a2ui_core, a2ui_agent and a2ui_flutter (github.com)
- What you supply
- RendelYour app's actions and screens; the catalog and the model are ours
- Flutter GenUIA catalog of your widgets and an AI backend such as firebase_ai (pub.dev)
- Doing things
- RendelCalls your API as the signed-in user. Anything that changes data waits on a confirmation card our server builds.
- Flutter GenUINot stated as a built-in feature (docs.flutter.dev)
- License and cost
- RendelPilot free; Starter $199 and Growth $799 a month with usage credit included; Enterprise by contract.
- Flutter GenUIBSD-3-Clause; you pay for the model you connect (pub.dev)
Where Flutter GenUI is the better choice
- Free and open source, from the Flutter team.
- Any model and any widget of your own.
- Part of the A2UI protocol work.
Where Rendel fits
- You need it in production now, not after an API redesign.
- You need actions with confirmation, an action log and a console.
- You also want the same assistant on your website.
Sources
- The genui package is in alpha and likely to change. docs.flutter.dev
- It composes UI from your existing widget catalog using a JSON-based format. docs.flutter.dev
- It is BSD-3-Clause licensed. pub.dev
Questions
Why not a render protocol?
We wrote that up: /docs/concepts/why-not-a-render-layer explains what a protocol leaves to you.