Are you talking about the app, or the web site?
The web site is at https://activecaptain.garmin.com
and is still functioning. I think there were some hiccups getting accounts moved over from Jeff. Mine worked fine so all I can say is you may have to re-register.
There's been a bit of history
with the apps. The most recent one does double duty as the interface to Garmin hardware
, but can still be used on its own to some extent. Likewise, some third-party apps which included AC data still work
, while others have dropped support. I'd start with the web site and be sure you have a working account before trying any apps.
But you actually raise a bigger question: Is AC still "Active?"
The jury is still out. The data around here is getting pretty stale, but some folks report seeing and making recent reviews
. I'd be thrilled to see it go back to the level of activity it had before Garmin acquired it, but I'm not optimistic.