Rendel vs building it yourself: what an in-app assistant takes to run
Building it yourself facts read on 12 October 2026 from Building it yourself’s own pages, rechecked every 90 days
Build it yourself if an assistant is your product and you want to own every layer. Choose Rendel if it is a feature of your product and you would rather not build and run the confirmation, governance, rendering on every platform and the console.
Side by side
- Rendering answers as UI
- RendelAnswers are pages of your app's own native components (cards, forms, charts, maps, receipts), in your brand.
- Building it yourselfAI SDK UI connects tool results to React components; RSC streaming is experimental (ai-sdk.dev)
- Actions and confirmation
- RendelCalls your API as the signed-in user. Anything that changes data waits on a confirmation card our server builds.
- Building it yourselfThe model only proposes calls; your app executes them, validates them and adds confirmation steps (learn.microsoft.com)
- Platforms
- RendelFlutter apps on iOS and Android, and any website. Native iOS, native Android and React Native are planned, not shipped.
- Building it yourselfWhatever you build; the AI SDK's UI hooks are for React, Vue, Svelte and Angular (ai-sdk.dev)
- Running it
- RendelConsole for your team: improve answers, switch actions off, read the action log
- Building it yourselfYou build the analytics, governance and tooling
Where Building it yourself is the better choice
- Full control of every layer and model choice.
- No vendor in the data path.
Where Rendel fits
- You want it live in your app without a team building it.
- You need Flutter as well as web.
- You want confirmation, audit and governance that already work.
Sources
- The AI SDK is free and open source under Apache 2.0. github.com
- AI SDK RSC is experimental; AI SDK UI is recommended for production. ai-sdk.dev
- With function calling, your application executes the functions; Microsoft advises adding user confirmation steps. learn.microsoft.com
Questions
Can we start with Rendel and build later?
Yes. Your actions call your own API, so the API itself stays yours whichever way you go.