Kestrel: Background Bird ID
Keep your focus on nature
About
This app identifies birds by their songs and calls using on-device processing. It notifies you when a starred or new bird is detected, allowing you to stay immersed in nature without constantly checking your phone. All audio is deleted immediately after processing.
What's New in Kestrel
1.1
September 5, 2026
Features: - Added the ability to record and view observations for species you have already seen - Added the ability to specify the date and location for recorded observations and to edit existing observations - Added the ability to export your life list as a CSV to import to eBird/Merlin - Updated the accent color to be the same purple as the buttons - Updated Apple Watch design to use larger images Bug Fixes: - Fixed opening the map from the life list tab sometimes not moving to the correct location - Fixed tapping on the search field sometimes being difficult - Fixed workouts sometimes not saving - Fixed the BirdNET model taking up too much space
MoreFAQ
How does Kestrel identify bird songs?
Kestrel uses Cornell Lab's BirdNET model to analyze bird songs and calls. The processing is done entirely on-device, ensuring your audio data remains private.
Does Kestrel have ads?
No, Kestrel is completely ad-free. The app is designed to enhance your nature experience without any interruptions from advertisements.
What devices does Kestrel support?
Kestrel is available for both iPhone and Apple Watch, allowing for seamless identification and notifications whether you're on your phone or wearing your watch.
How often is Kestrel updated?
The latest version, 1.1, was released on September 5, 2026. Updates are provided to improve functionality and accuracy.
Is Kestrel suitable for children?
Yes, Kestrel has an age rating of 4+, making it appropriate for younger users interested in learning about birds.
What happens to the audio recordings?
All audio processing happens on-device, and recordings are deleted immediately after identification, typically within a few seconds.
Can I customize notifications in Kestrel?
Yes, Kestrel notifies you when it identifies a bird you've starred in your life list or a species you haven't encountered before.
Is Kestrel's source code available?
Yes, the source code for Kestrel is freely available, reflecting a commitment to transparency and community involvement.