There’s no definitive answer to this question, as popularity is subjective and ever-changing. However, some of the most popular designers on Ravelry right now include Andrea Mowry, Stephen West, Ysolda Teague, Joji Locatelli, and Veera Välimäki. These designers are all well-known for their beautiful and innovative patterns, and they have a large and loyal following on Ravelry. If you’re looking for some new designers to explore, these are definitely some great places to start!