SEE: (TechRepublic Premium) Over the past year, Objective-C has slowly but surely dropped on that list. Tiobe theorized that Objective-C remained popular in part because Swift adoption slowed as mobile app developers turned to languages that could be used for building apps on multiple platforms. Swift meanwhile has fallen to 15th position on Tiobe's index today, down from 11th spot in April 2020. Another notable change is the re-emergence of Fortran in the index at 20th position, up from 34th spot a year ago. Fortran, which emerged from IBM in the 1950s, remains popular in scientific computing. Its highest ranking on Tiobe's index was 10th in 2002.