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Two-dimensional section polars do not tell you what a wing does. Induced drag, spanwise loading and the twist you dialled in all live in three dimensions, so this analyses the finite wing you drew — planform, dihedral, twist, root and tip sections together — rather than the airfoil it was built from.
AeroBuildup is a strip-theory pass that walks NeuralFoil section polars across the span: fast, and well behaved on cambered sections. The vortex-lattice method assembles and inverts an influence-coefficient matrix over a panelled surface, which resolves spanwise loading properly at higher cost. Both come from AeroSandbox.
An alpha sweep walks angle of attack across a range at fixed speed. A constant-lift sweep instead trims the wing to carry a target mass at each speed and reports what that costs — which is the question a foil or a glider actually poses, and it will find the speed where L/D peaks.
Fluid is a first-class input: air, fresh water or salt water, each with its own density and viscosity. A 450 mm hydrofoil at 5 m/s and an RC wing at 20 m/s land in very different Reynolds regimes, and the section polars underneath are evaluated at whichever one you are in.
Analysis is metered in credits because it is real compute: a strip-theory run costs one, a vortex-lattice run two or three depending on panel count. Every account gets a free monthly allowance first, and you are charged for the solver that actually ran — if a vortex-lattice run falls back, it bills at the cheaper rate.