[GRBurst]

Loving these kind of apps :-) I personally use WhoBird, which runs complete local on your android device, so it works also when you don't have internet and is available on fdroid (https://f-droid.org/packages/org.woheller69.whobird/). Will give merlin a shot as well to see how it compares

[mplanchard]

Merlin also works offline. I use it all the time out in the mountains.

[yaky]

AFAIK WhoBird uses the same model (or at least, also developed by Cornell), but for me, Merlin is still better at identifying multiple birds at once.

[GRBurst]

whoBird is only working with audio (and not photos) though