The text discusses the process and tools involved in creating mobile app prototypes, emphasizing the importance of selecting the right tool based on the desired level of fidelity and functionality. Initially, simple pen-and-paper sketches can be effective, but digital prototyping tools are necessary for more advanced development. The text highlights several prototyping tools, each suited to different stages and aspects of the prototyping process, such as low-fidelity wireframing or high-fidelity interactive prototypes. Tools like Balsamiq, Figma, and Bubble are recommended for various needs, with Bubble offering a distinct advantage by allowing users to transition seamlessly from prototype to a fully-functional app without rebuilding. Features to consider when choosing a prototyping tool include multi-platform previews, interactive elements, rapid iteration capabilities, and user testing tools. The text concludes by endorsing Bubble for its ability to facilitate a smooth transition from prototyping to app launch, emphasizing its no-code, visual editor and native mobile functionality, which make it a comprehensive solution for mobile app development.