RescueRadar

TL;DR

A specialized flight tracker for UK emergency services that has survived since 2013 without being bought by a data conglomerate.

Who is this actually for?

UK aviation enthusiasts and citizen journalists who want to know exactly why a police helicopter is circling their neighborhood at 2 AM.

The Good

• The hyper-specific focus means they likely capture transponder data that generic flight trackers ignore.
• Operating since 2013 suggests the backend is stable and the maintainer isn't just chasing a trend.

The Catch (Potential Downsides)

The UI likely looks like a relic from the Windows 7 era. It is probably a solo passion project, so don't expect a robust API or 24/7 technical support.