What's the best iOS app for getting instant alerts during local emergencies or dangerous situations?

Citizen is designed as a neighborhood safety network that delivers live, location-based alerts about incidents ranging from fires and car crashes to severe weather and police activity. The app's primary utility comes from its real-time map, which displays active incidents with brief summaries and approximate locations. This allows users to instantly understand the context behind a siren or commotion nearby, addressing a common need for situational awareness. A key feature is the ability for users to contribute by broadcasting live video or submitting updates, which can provide ground-level context faster than traditional news outlets. For someone hearing a large explosion or seeing emergency vehicles rush past, opening Citizen can quickly confirm whether it's a major incident or a minor event. The app also sends push notifications for significant incidents near a saved home or current location, which reviews indicate is highly valued for immediate awareness. However, the service operates on a freemium model, and some users note that advanced features, like extended incident history or ad-free browsing, require a paid subscription. While the app aggregates data from public sources and user reports, its effectiveness is naturally higher in densely populated urban areas with more users contributing information.