iPhone Screenshots


Birdathon is a tool for recording your bird observations, organizing your bird checklists and sharing your birding stories with others. It is designed to be used in the field to efficiently record birds as you observe them. You can quickly record whether a bird is seen or heard and the number observed. The time and location of each observation is automatically recorded. You can add field notes to each observation. You can correct the location, time entries and the count of birds observed at any time to ensure your records are accurate.

Your checklists can be viewed in taxonomic order (as defined by the American Ornithological Society), alphabetically or as a timeline of birds in the order observed. You can intersperse your checklist with notes and other observations such as mammals, butterflies, wildflowers, etc., to make it into a rich recording of your time in the field. You can organize your checklists into categories such as Day List, Year List, County List, Life List, Big Sit, etc., and assign color themes to your lists.

You can send an email report that includes your timeline, all notes you take in the field and a taxonomic list of birds observed. You can view a map of your sightings and include the map in your email report. You can export your checklist as a comma-separated-values (csv) text file for import into eBird.

A Summary view aggregates bird observations from all your checklists across different time spans (week, month, year, etc.) and geographic locations, sorting the information in various ways. You can export Summary data into a csv text file.

Birdathon is customizable. Bird species may be added and deleted from lists you create. You can create new checklist templates from your previous lists or import templates created by others. You can import a text file into Birdathon and it will automatically be made into a bird checklist template.

Birdathon includes the latest checklists of the American Birding Association (ABA) and the American Ornithological Society (AOS) and covers the geographic range defined by the AOS from their 58th Supplement to the Check-list of North and Middle America Birds. Note: the AOS was formerly the American Ornithological Union (AOU).


AOS Checklist 58th (2017) derived from the American Ornithological Society's Check-list of North and Middle American Birds, updated through the 58th supplement (July 2017). Copyright ©2017 American Ornithological Society. Used with permission.

ABA Checklist v8.0.2 (May 2018) derived from the American Birding Association's checklist of North American Birds. Copyright ©2018 American Birding Association, Inc. Used with permission.

Santa Clara County 2017 Checklist derived from the Santa Clara Valley Audubon Society 2017 and earlier County Bird Lists, maintained by Brooke Miller. http://www.scvas.org/page.php?page_id=6633. Used with permission.

App Preview music "Carefree" by Kevin MacLeod (incompetech.com). Licensed under Creative Commons: By Attribution 3.0

What's New

Version 1.1.1

This release incorporates the new ABA 8.0.2 checklist (May 2018) with four new bird species added.

In the Map view, different colored pins now distinguish notes, non-bird items and indefinite birds from bird sightings.

In the Summary View, sorting by Family now organizes birds by observed count within each family.

Other changes:
• Fixed a bug in the Summary View where some birds can have a 0 or negative count when limiting geographic range
• Fixed a bug in the Summary View where indefinite birds show up in the map even when not shown in the summary
• Fixed a bug in the Summary View where old checklists sometimes displayed birds in the wrong family
• Summary View options text is no longer truncated on smaller iPhones
• Other small bug fixes and layout tuning


Barry Langdon-Lassagne
23.5 MB
Requires iOS 10.1 or later. Compatible with iPhone, iPad, and iPod touch.
Age Rating
Rated 4+
© 2017–2018 Barry Langdon-Lassagne
In-App Purchases
  1. Incredible Tip $4.99
  2. Amazing Tip $2.99


  • Family Sharing

    With Family Sharing set up, up to six family members can use this app.

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