The Rapid Diagnostics Toolkit is an Open Source and community supported middleware layer for improving access to digital technologies which facilitate the use of Rapid Diagnostic Tests at the point of care in global health. The toolkit provides out of the box support for: * Timers for test resolution and expiration (and support for running many timers simultaneously) * Image Capture and Cropping for RDT Cassettes * Computer Vision based classifiers and multiple UX modes for integrating classifier results * Multi-lingual visual aids for test administration * Easy integration / interoperability with other digital tools * An up to date library of RDTs catalogued by the community