I use Windy heavily on my sailboat, but for the past 7-ish days, the wind predictions will show 4 or 5 knots, and the color will show orange or red, which I associate with wind conditions from 15-20+ knots. I was out in my dinghy and can say with complete certainty that the 4-5 kt winds Windy was showing were absolutely not accurate. The wind was much closer to 12-15 kts, and I have the saltwater bath to prove it.
I understand that mistakes are made and bugs occur, but if this simple function can't be managed, I will cancel my premium account. My wife and I live on our boat, and accurate forecast information is paramount for literal survival. I always double-check with other sources, NWS, PredictWind, local marine forecasts, etc., but there is no reason to pay for premium if the information isn't accurate.