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Orange Whip said..
I'm sure many will correct me if I'm wrong, but, aren't all the wind/weather sites getting their data from the same recording stations? So, why do we need more than one?
Yes and no.
Actual wind readings do usually come from the same BOM sites in Australia so the reporting of those readings in in Apps is just differentiated by the ease of use and access really.
On the other hand,
Forecasts in Australia can come from any one, two, or more of (rare), at least six world weather computer models:
-The Weather Research and Forecasting (WRF) Model.
-The two BOM models:Australian Community Climate and Earth-System Simulator (ACCESS-R) and Australian Community Climate and Earth-System Simulator (ACCESS-G)
-European Centre for Medium-Range Weather Forecasting model (ECMWF)
-Global Forecast System (GFS), sometimes called the US Model.
-The global implementation of the Global Environmental Multiscale (GEM) A Canadian model also called CMC.
There are probably others, but these are the ones I can access in Weatherzone Pro.
Windguru uses the GFS model. At times this can give different longer term forecasts from some of the others. In fact, at times, they can all vary quite a bit past a couple of days into the future. It is very encouraging when they all closely agree and those forecasts tend to be far more reliable from my observations.
Predictwind uses both the GFS and CMC models, but they modify them for local conditions in Australia and New Zealand
MetEye is, of course, based on the BOM models.
Bouyweather was based on GFS last time I looked.
I have not kept up with what other forecast Apps are based on, but a bit of digging in their FAQ's and website usually turns the answer up pretty quickly.
It is sometimes handy to know this info if you are using more than one website or App. If they are based on different models and they both/all agree, it is usually a good sign.

Wind junky could fill us in and correct this with a lot more detail I am sure.