I Built an Offline Compass App That Tells You When Not to Trust It

We built NorthPin — a free, offline compass app for Android and iOS that points to true north, flags magnetic interference, and lets you lock a bearing while you walk. No ads, no tracking, no internet required. If you've ever watched a compass needle jitter wildly next to a car or near a doorframe and wondered whether you can actually trust it, that's the problem we wanted to solve. What Does It Do? NorthPin turns the magnetometer in your phone into a reliable navigation instrument. You open it,