SweetSpot API
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One thing you guys might not know is that the sweet spot data is publicly available so can be used in any app!
Here is an example API request on V1 of the API http://sweetspot.nfcring.com/api/v1/sweetspot?model=HTC One_M8
This API request shows the JSON result of XY co-ordinates (To draw on a screen) of the HTC One.
This can be used with the heatmap.js javascript library to draw the heatmap on anything that is javascript enabled: http://www.patrick-wied.at/static/heatmapjs/