Fast calculation of the spectrum of a photoionised gas, assuming low optical depth and homogeneous temperatures and densities. Still under construction and might be riddled with bugs! Currently, using contemporary machinery and current versions of Chrome and Firefox, up to 1415 emission line fluxes plus hydrogen and helium continua are calculated in <50ms. Plotting takes 50-150ms. On a basic smartphone it takes about two seconds to calculate and plot a spectrum.