It is not every day that one encounters an app forewarning users that “to make full use of this app a basic knowledge of quantum mechanics…is recommended.” (Oh, quantum mechanics—is that all?) And yet, that is the recommendation from the people behind the Insensitive app, a nifty app that allows users to visualize the nuclear magnetic resonance (NMR) experiment at the level of the quantum mechanical models that describe the experiment (such as spin state). The app includes a fairly detailed tutorial section that at least introduces concepts such as spin, vector models, basic equations of quantum mechanics, Fourier transforms, and pulse sequences used in different NMR experiments. Still, the app is definitely geared for a specialist audience. The simulations for spin state and spin network include many adjustable parameters, and users are able to program a pulse sequence for an experiment and view the resulting NMR spectrum.