arXiv:2604.05975v2 Announce Type: replace Abstract: In this paper, we present a novel numerical method for computing the Steklov spectrum of bounded and unbounded simply connected planar domains with smooth boundaries. For the unit disk, the Dirichlet-to-Neumann operator can be written explicitly in terms of the classical conjugation operator. We extend this framework to general simply connected domains by expressing the Dirichlet-to-Neumann operator in terms of the generalized conjugation operator, which is defined via the boundary integral equation with the generalized Neumann kernel. Combined with Fourier differentiation on an equidistant boundary grid, this approach leads to a dense algebraic eigenvalue problem for the boundary traces of the Steklov eigenfunctions. The resulting method is simple, highly accurate, and uses only boundary data. It treats interior and exterior problems in a unified manner and reconstructs eigenfunctions inside the domain using the Cauchy integral formula. Numerical experiments on benchmark domains and parameter-dependent smooth families, including ellipses and star-like curves, demonstrate high accuracy and illustrate how the Steklov spectrum changes with geometry.