Ridgeline
Ridgeline is a hiking app with bold, simple trail maps that work offline. It runs in your browser and can be installed to your home screen.
Find trails near you or any place you search, see distance, climb, estimated time and difficulty, save a trail's map to your phone, follow live GPS directions with an off-route alert, and record your own hikes as GPX files. There are no accounts. Your saved trails, recordings and live GPS position stay on your device; place searches, trail data and map tiles are requested from third-party services for the area you look at.
Trail data comes from OpenStreetMap contributors. Ridgeline needs JavaScript to run.