Astro-COLIBRI features a public API, real-time databases, alert systems, a website, and iOS/Android apps as user clients. In real time, it evaluates incoming astronomical observation messages from various alert streams, filters them based on user-defined criteria, and contextualizes them in the multi-wavelength (MWL) and multi-messenger (MM) context. User clients offer a graphical representation, providing a succinct summary for quick identification of interesting phenomena, assessing observing conditions globally, and more. This contribution presents the key features of Astro-COLIBRI, outlining its architecture, summarizing data resources, and offering examples of applications and use cases. Demonstrating the added value of the platform in searches for counterparts to high-energy neutrinos, gamma-ray bursts, and gravitational waves.