Transforming a user-interface modality of a software application can include identifying a first workflow segment corresponding to a UI modality of an application developed to run on a predetermined data processing platform and selecting one or more other workflow segments to transform the UI modality of the application. Each other workflow segment performs on a different data processing platform a function comparable to a function performable by the first workflow segment. The one or more other workflow segments can be selected from a multi-member set of alternative workflow segments that are semantically similar to the first workflow segment. The selecting can be based on classifying the first workflow segment with a classification model trained using machine learning to map workflow segments and corresponding UI modalities to different processing platforms.