Fancy Core
The stack every Fancy app starts from: the React primitives, the Inertia bridge, server state that stays live, and the agent backbone.
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What react-fancy actually is
~8 min
react-fancy is roughly 70 Tailwind v4 primitives — the layer everything else in the suite composes against.
The number that matters more is this one: the suite ships 261 installable registry entries, but only 215 are attributed to a package. Those two counts measure different things, and quoting the wrong one makes you sound like you have not looked. The registry count includes package-qualified duplicates — fancy-3d-babylon-stage and fancy-3d-three-stage are the same component backed by two engines, so it appears twice in what you can install and once in what the packages page counts.
Action is retired. Emit Button and ButtonColor. Action survives only as a @deprecated alias, and reaching for it in new code is the clearest signal that something was copied from an old example.