Mobile app users post their opinion about the apps, report bugs or request features on various platforms, the main one being App Stores. Previous research suggests that Twitter should be used as an additional resource to receive users’ feedback, as app users tweet different issues. Although the classification and review summarization methods are developed previously for each platform separately, manual investigation of reviews or tweets is still required to identify the similar or different points that are discussed on App Store or Twitter. In this paper, we propose a framework to study the differences or similarities among app reviews from Google Play Store and tweets automatically by using the semantics of the words. The results from several experiments compared with expert evaluation, confirm that it can be applied to identify the similarities or differences among the extracted topics, n-grams, and users’ comments.