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What's the largest, most complex application running on Anvil today?

That I can talk about publicly? Probably https://lightningai.com/.

Their control panel drives companies' entire online marketing operation - creative, targeting, performance, and more - across multiple advertising services. That's a whole lotta UI. Their back end drives the advertising platforms' APIs (eg Google and Facebook), and it all hooks into great big machine learning operations that run on big beefy servers out in EC2. Not just a pretty CRUD app, that's for sure.

(Unfortunately, they know what their services are worth, so I can't just point you at a live demo ;) )

So, the UI/front0end of their app was created with and runs on Anvil, but the backend is entirely under their control? That's interesting. Very interesting.

Their backend is partially inside, partially outside Anvil (eg I believe the campaign management backend runs in our hosted server modules, but the compute-intensive machine learning is offloaded). And it's all under their control - it's their code!

The wonderful thing about the Uplink is that the boundary between "inside Anvil" and "outside Anvil" can be very fuzzy, because you use the same APIs. (See my "escape hatch" post above)

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