Trail Sense.
By Kyle Corry
Trail Sense turns a phone's own sensors into offline hiking tools. Kyle Corry's Android app can mark beacons, retrace a walk, read a compass, forecast weather from a barometer, and warn before sunset. It does not use the internet, and the project page grants the software under the MIT license, free of charge.
The F7 Insight
The useful constraint is the missing network. A trail tool that refuses the internet has to be honest about the sensors in your pocket, which is a better hiking companion than a forecast that disappears when the signal does.
A closer look.
- 01
Mark beacons, follow paths, and retrace a walk with backtrack.
- 02
Use a compass on phones that have a compass sensor.
- 03
Treat a photo as an offline map and plan a packing list.
- 04
Forecast weather where a barometer exists, and alert before sunset.
- 05
Keep sensor and location data on the device; the app does not use the internet.
- 06
Install from Google Play or F-Droid under the MIT license.
Sources & credits
Verified against the sources below. Features, pricing, and availability may change; check the creator’s current information before installing or buying.
- Official readme: offline tools, Play and F-Droid links, MIT grantChecked 16 Oct 2026
- Official project page repeating the MIT grant, including free of chargeChecked 16 Oct 2026
- Developer store description of tools and offline useChecked 16 Oct 2026
- MIT license by Kyle Corry, with no icon exceptionChecked 16 Oct 2026
- Official icon used unmodifiedChecked 16 Oct 2026
Artwork acknowledgments
Trail Sense icon by Kyle Corry, from the official fastlane metadata. Copyright (c) 2020 Kyle Corry, MIT license. The readme does not exclude the icon. Image used unmodified.