When 2 Surf
Andrew Azimov submitted his app When To Surf to Product Hunt in February, 2017.
It got 149 votes that day and ranked #7. Within a week, the app had gotten 285 votes and was the top app in the Sports, Weather, Surfing categories.
He wrote a comprehensive overview of the launch at When To Surf became #1 app in Sports, Weather, Surfing on Product Hunt + 3000 people tried it.