You do not need to create an account to use the Audubon Bird Guide App.
You can use many features without creating an account including:
Bird ID
The Field Guide
The Explore section to identify the birds around you
If you try to access a feature of the app that requires an account, such as logging a sighting, sharing a photo, or keeping a list of sightings, you’ll be prompted to create one.
Your account and all its data, including sightings, lists, locations, and private photos, is all private to you—only photos that you choose to share publicly will be viewable by others.