On Nickelodeon UK, Winx Club increased the network's ratings by 58% on its launch weekend in 2011. As of 2020, Nickelodeon UK still airs the show twice every day.
There is a total of 10 transformations (Magic Winx, Enchantix, Believix, Harmonix, Sirenix, Bloomix, Mythix, Butterflix, Tynix, Cosmix), 2 sub-transformations (Sophix and Lovix) and 4 additions to transformations (Charmix, Speedix, Zoomix and Tracix) in the series.
Season 4 is the only season not to feature Trix as the villains.
Iginio Straffi, the creator of Winx Club, is the founder of the Rainbow S.p.A. animation studio. Viacom, the media company that owns Nickelodeon, became a co-owner of Rainbow S.p.A. in 2011.
Bloom, Stella, Aisha, Roxy and Flora are officially princesses of their home planets.