Fourier App vs BitSpinner

Fourier App is an interactive tool for visualizing and computing Fourier Series of piecewise functions. Define custom functions with multiple pieces and discontinuities, choose the time window, and instantly see the original signal x(t) alongside its series approximation s(t). Browse a built-in catalog with classic examples like sine, cosine, step function, rectangular, triangular, ramp, parabola, and more. View the frequency spectrum with an, bn, and cn coefficients, filter partial series terms, and explore how each harmonic contributes to the final waveform. Includes a theory section covering Fourier Series history, equations, and real-world applications such as audio streaming and noise cancellation.

Spinner makes quantum intuition visual, interactive, and fun. Explore a live Bloch sphere, drag to rotate and pan, and apply quantum gates instantly to see how a qubit evolves in real time. Spinner shows both geometric motion and state notation side by side, so you can connect what you see to what the math means. Built for iPhone and iPad, Spinner combines a clean control surface with a moody, immersive 3D scene to help you learn, teach, and experiment. Real-time Bloch sphere interaction Instant gate application (X, Y, Z, H, S, T, and more) Live α/β state readouts in multiple forms Smooth camera controls and polished visual modes Great for students and educators