Online shopping is so easy, but it’s sometimes helpful to try things on in the store. Swirl, a mobile app, combines the two shopping experiences into one. It helps users track the latest trends and sends them alerts when a saved style goes on sale. Users can also save and organize their favorite products in the app, which then locates the items in nearby stores. Swirl’s new in-store feature automatically sends users limited-time offers the minute they walk into a participating retailer.