Question: How can I quickly prototype and experiment with different web app designs without spending hours writing code?

For rapid prototyping and experimenting with different web app designs, Uizard is a great AI-powered UI design tool. It lets you quickly create and iterate on product designs, even if you're not a skilled designer. Uizard has a text-to-UI generator, drag-and-drop editor, and tools like Autodesigner 1.5 and Screen Generator to create and refine designs. It also offers real-time collaboration and design sharing as interactive prototypes or in CSS or React code, making it great for web and mobile app designs.

Another option is Bubble, a no-code app builder that lets you create, design, test and deploy production-ready apps without any coding experience. With hundreds of customizable templates, a drag-and-drop editor and AI-generated pages, Bubble lets you build scalable and secure web applications. It also offers real-time collaboration and a range of pricing tiers, so it's good for startups and enterprises.

GPT Engineer is another natural language and AI-powered tool to speed up web application development. It lets you build full-featured web apps through interactive prototyping and deployment. With tools like a natural language editor, Git integration for real-time collaboration and the ability to turn plain language into code, GPT Engineer is designed to democratize software creation and get you results fast.

For a more collaborative approach, Mockitt is a full design, prototyping and collaboration tool. It includes AI-powered tools like AI prototype generation and real-time collaboration tools. Mockitt is good for everyone from UX designers to developers, and it's good for web and mobile app designs, with a free version to get you started.