Forgive my ignorance but I am curious if this be a good alternative for an android user who uses a Fitbit primarily for tracking sleep and heart rate and who wo

Forgive my ignorance but I am curious if this be a good alternative for an android user who uses a Fitbit primarily for tracking sleep and heart rate and who would love a more open platform? Would something like this be usable as a reliable replacement or is it more targeted at hobbyists? What apps do pebble users use for tracking things like heart rate, sleep and steps?