Possibilities:
Graphics with two-finger zoom, panning, and double-tap to fit.
The "Compare all methods" checkbox shows all curves at once. In Newton's case, the curve is dotted to show that it matches Lagrangian.
Value at given x. For examples, both the exact value and the error are shown.
Warnings about extrapolation and the Runge phenomenon.
5 examples. The two with the Runge function (equidistant nodes and Chebyshev nodes) clearly show why the spline is better.
Menu with "Theory", sharing results and changing the language.
Languages: English (default), Bulgarian, German, French, Spanish.