About
CrosbyTrails.
A private iOS trail journal for dogs — built for the dog you love and the walks you'll want to remember.
Why this exists
Most dog-tracking apps are fitness trackers in disguise. They count miles. They push streaks. They optimise.
That's fine. But it's not what walking the dog feels like.
Walking the dog feels like the same loop through the woods on a Tuesday morning. The hill where she pulled the leash for the first time. The trailhead where she wouldn't get out of the truck because it was raining. The bench where you sit and let her sniff for ten minutes because you're not in a rush today.
Who Crosby is
Crosby is a Nova Scotia Duck Tolling Retriever from Cape Breton — a real dog, with a real owner, and a real preference for the same three trails over and over. He's the founding demo dog and the reason the app has the name it has.
The app supports as many dogs as you want. The default seed data ships with Crosby plus a second Toller named Maple so multi-dog features feel right out of the box. Add your own dogs at first launch and the demos disappear.
What we believe about your data
CrosbyTrails is built on a simple promise: your walks are yours.
- No servers — there is no CrosbyTrails backend, because we never built one.
- No accounts, sign-in, or email collection inside the app.
- No third-party SDKs. The app is built only on Apple's frameworks (SwiftUI, SwiftData, CoreLocation, MapKit, WeatherKit, HealthKit, Core Motion, ActivityKit, WidgetKit, AppIntents).
- No analytics. No telemetry. No "anonymous" data collection that quietly identifies you anyway.
- Free, with no ads.
The only thing CrosbyTrails sends to anyone, ever, is a single weather lookup at the end of each walk — straight to Apple's WeatherKit. The full breakdown is in the privacy policy.
How it's built
iOS-only and proudly so. Building on a single platform with a single language (Swift) and a single design system means more time on details — the way a butterscotch bar in the weekly chart looks against the moss-green background, or the moment a flame icon bounces when you log your fifth straight day.
The app needs iOS 17 or later. It runs on iPhone and iPad. There is no web version, no Android port, no Apple Watch app — those would split focus, and CrosbyTrails is sharper as one thing done well.
What's coming
- iCloud sync — opt-in syncing of your walks and trails between your iPhone and iPad. On the roadmap, not in v1.
- Trail sharing — send a saved trail to another CrosbyTrails user via CloudKit's built-in sharing. After iCloud sync ships.
- App Store launch — currently in TestFlight; App Store release follows beta validation.
If you want early access, mention TestFlight in your email.
Get in touch
The fastest way to reach the founder is email — questions, feature requests, photos of your own dog, all welcome.