TrailMark

TrailMark lets hikers log routes, photos, and notes without cell service, then merges entries across devices once back online. A concept exploring offline-first mobile UX.

Most hiking apps assume constant connectivity, breaking exactly when users are deepest in the backcountry.

I prototyped a local-first sync model where the device is the source of truth and the cloud is just another replica.

• Conflict resolution when two devices edit the same trail
• Battery-friendly GPS logging over a full day hike

A working prototype validated the offline-first approach; paused pending partner interest in the outdoor space.