A brilliant app concept isn’t enough anymore. Many startups crash after launch because they underestimate the challenges in mobile app development — from budget overruns to monetization gaps and poor scalability. The reality is, building the app is only half the battle. Marketing, analytics, retention, and updates play just as big a role. Without a clear business strategy, even top-tier products fade fast. If you’ve launched an app before, what was your biggest business challenge — funding, marketing, or retention?