Merlin wasn't available here when I checked at some point in time (last year?)

whoBIRD does use BirtNET, from Cornell, so it's basically the same backend (although it may be an older version).

I recently tried out Merlin (which is now available here) and it's amazing. It's definitely more featureful than whoBIRD, although both have the core "recognize bird directly using your phone" features.

For anyone OK with non-FOSS apps, Merlin is great. For anyone who wants a FOSS app for bird detection, whoBIRD is still pretty good.

Either way, identifying apps using ones phone is nice. 👍 Big things to Cornell for making the ML for both of these apps.