The work of building cloud-based diagnostic image libraries is significant, but the reward is potentially large. Once a library is useable, the owner of the library could offer access on a subscription basis. With such a large demand, we can expect that a relatively small subscription could generate significant revenues, further accelerating the development of new libraries of pathogens. Andrew Monk of ioLight Limited discusses how expert opinion and local knowledge are essential to diagnosis, but providing real-time diagnostic assistance to clinicians will greatly increase the reach of healthcare.