What Gyro.js does:

• listens for deviceorientation and devicemotion events
  
• converts and adjusts the measured values so they are the same for every orientation (portrait, landscape
  left, landscape right)
  
• updates a gyro object with 7 attributes that you can read at any given time:
• Android only (iOS support coming soon)

orientation:

0 : portrait, 90: landscape left, -90: landscape right.

alpha:

value = 0 on load,
values up to 180 by rotating on your left and down to -180 by rotating on your right.

beta:

value: 0 when standing vertically,
values down to -90 when the screen is facing down, up to 90 when it's facing up,
whatever the value of gyro.orientation is.

gamma:

value: 0 when standng vertically,
values up to 180 by tilting the device on the left and down to -180 by tilting on the right,
whatever the value of gyro.orientation is.

x:

acceleration along the axis from your front (positive values) to your back (negative values),
whatever the value of alpha, beta and gamma are.

y:

acceleration along the axis from your left (positive values) to your right (negative values),
whatever the value of alpha, beta and gamma are.

z:

acceleration along the axis from your up (positive values) to your down (negative values),
whatever the value of alpha, beta and gamma are.

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Note

The values returned for alpha, beta and gamma are non-standard (specific to Gyro.js).
I've put them this way to make them more dev-friendly.
(see QUIRKS.md for more details about native values)

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Note 2

Gyro.js is < 700b minified, promise-less, and ES6-less.
For more features and less value harmonization, take a look at Full-Tilt + Gyronorm.js (18.1kb minified)