Cairn

Scratch off every U.S. national park and state you have visited. One topo map, a growing cairn, and a widget that keeps your progress on the home screen — no streaks, no account.

Download on the App Store Privacy

Why Cairn

63 national parks and 50 states as collectible scratch map progress
Log a visit in seconds — backfill decades of trips without dates
Share cards with your map for stories and posts
Private: on-device data, optional iCloud sync, JSON export

Support

Questions or feedback? Email support@willalston.workers.dev (subject: Cairn).