What's the best iOS app for identifying birds by sound?

Merlin Bird ID by Cornell Lab stands out as an excellent iOS app for identifying birds by their sounds. Its impressive accuracy and informative interface highlight the bird as it listens, making the identification process seamless. The app's advanced features, such as spectrograms, allow for a deeper analysis of bird vocalizations. You can even compare sounds to those recorded in the app from specific locations. Users have praised its ability to open "a whole new level" for birding, especially for those with hearing impairments, allowing them to "hear" the birds around them. The app's ability to identify birds by sound or picture, combined with its location-based features, makes it an invaluable tool for both novice and experienced bird watchers.