AllTrails is a trail guide app founded in 2010 and based in San Francisco.
Users search a large database of hiking, running, biking and walking trails, filtered by length, difficulty, distance and features such as dogs allowed or waterfalls. Each trail has a map, elevation profile, photos and reviews from other hikers. The app records hikes with GPS so people can follow a route and see where they are.
The basic app is free. AllTrails+ is a paid plan that adds offline maps, wrong turn alerts, live sharing with friends and map layers.