TRENDER™ let’s fashion lovers discover trends and even participate in making them happen. TRENDER. See the Trend. Be the Trend. How it works: users swipe right to trend a product up and swipe left to trend a product down. Then find out if you voted with or against the trend.Users who are on-trend earn points for discounts of their favorite products! The app also features our award-winning API’s wish-list function and price notification engine.