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-# AsteroidOS Hello World App
-A simple hello world app for [AsteroidOS](http://asteroidos.org/)
+# Asteroid-health
+A health tracker frontend for the data collected by sensorlogd
+
+# Basic usage
+Currently the app doesn't expose everything that the logger does.
+
+What the app does:
+* show steps data (total steps per day)
+* allow turning on and off the step and heartrate tracking
+
+What sensorlogd allows, which isn't used by the app:
+* setting custom recording intervals
+* display heartrate data (the data is recorded but not displayed)
+
+TODO:
+* translations
+* recording of other sensors, such as GPS, altimeter or barometer (it's a sensor logger, not just a health tracker)
+
+## Getting your data
+It should be obvious from a quick search of this source code that neither the app nor the logger contain any way to leak your data onto the internet. Your data is yours to keep: here's how you can get to it.
+
+Data is stored in plaintext in ~/.asteroid-sensorlogd/ . There are separate directories for each sensor, and within those are separate file for each day.
+
+Each line in a file is a single recording, in the format `[seconds since UNIX epoch]:[value]`.