THINK The user wants a title in the format “[Word 1] vs. [Word 2] – Which is Correct?”. I need to identify the two words/phrases being compared in the article content. The article content clearly discusses “in the app” and “on the app”. I will capitalize them correctly as “In the App” and “On the App”. Word 1: In the App Word 2: On the App Format: [Word 1] vs. [Word 2] – Which is Correct? Result: In the App vs. On the App – Which is Correct?