I spent the last 72 hours stress-testing the four most hyped vibe coding tools of 2026—Base44, Replit, Bolt, and Lovable—to answer one question: which one can actually build anything you throw at it? I ran identical prompts, one-attempt-only (no follow-up “fix it” prompts), and graded every tool across speed, error management, functionality, and creativity. Then I made them build eight projects across four categories: websites, games, web apps, and platform replications (simple + complex in each). What I found is most tools can generate something that looks decent… until you try to use it. Lovable is fast and clean during generation, but it breaks hard on real functionality—its SEO analyzer couldn’t fetch URLs, and the Kanban board didn’t even finish generating. Bolt is stable and can build working logic (its Kanban and FPS were solid), but the designs often feel bare and it “replicates” platforms by building generic systems instead of convincing clones. Replit brought the most polish and actually shipped a working SEO analyzer with real outputs, plus a legit Kanban app—but it’s slower, and it struggled with stability on the complex 3D shooter. By the end, you’ll know which platform deserves your time in 2026—and which ones I’d avoid if you want to build real apps, not just pretty mockups.