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Search for subway stations nationwide or filter by line to set your destination. The foreground service will send you a proximity notification when you're within a user-specified distance (e.g., 0.5-5km).

Check real-time arrival information for stations you've added to your favorites, in both up and down directions, to easily check transfer times and the arrival time of the next train. You can also customize the notification title, content, and distance.

The notification automatically deactivates after a single sound and reactivates when you move away, reducing redundant notifications. It also explicitly requests location permissions for peace of mind.

It features an intuitive navigation bar and settings screen, and it reliably tracks your location even in the background, ensuring you never miss a train departure!