  Astro-COLIBRI is a novel tool that evaluates alerts of transient observations
in real time, filters them by user-specified criteria, and puts them into their
multiwavelength and multimessenger context. Through fast generation of an
overview of persistent sources as well as transient events in the relevant
phase space, Astro-COLIBRI contributes to an enhanced discovery potential of
both serendipitous and follow-up observations of the transient sky. The
software's architecture comprises a Representational State Transfer Application
Programming Interface, both a static and a real-time database, a cloud-based
alert system, as well as a website and apps for iOS and Android as clients for
users. The latter provide a graphical representation with a summary of the
relevant data to allow for the fast identification of interesting phenomena
along with an assessment of observing conditions at a large selection of
observatories around the world.
