Most app ideas are wrong.Not slightly off. Not "e;needs refinement."e; Wrong.And now AI has made it easy to turn a bad idea into a polished, working app in a weekend—complete with login screens, dashboards, and features nobody asked for.You can build it. That doesn't mean you should.DON'T BUILD THAT YET is a brutal, practical filter for one question:Is this idea actually worth building—or are you about to learn an expensive lesson?Inside, you'll learn how to:Tell the difference between a real problem and one that just sounds goodIdentify who would actually use—and pay for—your appValidate demand using behavior, not opinionsSpot when your "e;technology problem"e; is actually a people problemAvoid the hidden costs that quietly kill solo-built appsKnow when to keep building—and when to stopThis is not a book about coding.It's not about tools.It's not about building faster.It's about not building the wrong thing.Whether you're sitting on an app idea, already deep in a build, or wondering why what you shipped isn't working—this book will force you to face the one thing most builders avoid: reality.Because the most expensive mistake in software isn't building something badly.It's building something nobody needed.Includes chapter-by-chapter checklists and ready-to-use AI prompts to pressure-test your idea at every stage.