AI app builder

Describe it.
Watch it get built.

Foundry turns a plain-language description into a working web app — then quietly routes each step to the cheapest AI model that can do it well, instead of billing every keystroke at premium-model prices.

No account, no code, no 40 settings panels to learn first.
foundry.app/new
Pick a suggestion above, or open the full builder to describe your own.
What's different

All the building, none of the noise

What Foundry keeps

  • Describe your app in plain language and watch it get built live
  • A real, working preview you can click through as it's made
  • One-click publish to a live web address
  • Login, database and email, set up automatically when your app needs them

What Foundry cuts

  • Framework, runtime and hosting-provider pickers
  • A file tree and raw code view you have to open by default
  • Environment variables, build flags, container config
  • Per-request premium-model pricing for every small edit
Under the hood

One request, several models, one bill

Every build is broken into small steps. Foundry's router sends each step to the smallest model that can do it reliably, and saves the expensive, high-reasoning model for the parts that actually need it.

Your promptplain language
Routerpicks a model per step
Fast modelplanning, copy
Balanced modelpages, styling
Deep modeldata & logic only
Assembled appreviewed & merged
$0.91
avg. compute cost to build a first working app on Foundry
$2.40
avg. cost for the same build on a single premium-only model
~62%
typical compute savings from routing instead of one model for everything
Illustrative figures for this preview — real usage-based pricing lands with the connected backend.

Bring an idea. Leave with a live app.

Ten minutes, one conversation, no setup screens.

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