FouSE-Fourier Series Expansion is an Android app designed to aid undergraduate students in learning about Fourier series expansions. The app features an easy-to-use and friendly interface that can help students test and assess Fourier series expansions on typical sets of signals such as sawtooth, full and half wave rectified sine, square, triangle, and parabolic.

One of the best features of this app is that it allows students to control the total approximation error and the number of terms or harmonics used in the expansion. This means that students can test different scenarios and see how the Fourier series behaves. FouSE-Fourier Series Expansion is a free app that can be downloaded from the Google Play Store.