This guide evaluates ten mobile app prototyping tools ranging from low-fidelity wireframing solutions like Balsamiq for early brainstorming all the way to Bubble for building fully functional production apps. The article explains that most prototyping platforms prioritize web design over mobile-specific features, and recommends Figma for design-focused prototypes and ProtoPie for user testing. Teams are guided to choose tools that match their current stage of development rather than committing to a single platform.