Feature-by-feature comparison of three AI app builders — Atoms.dev, Lovable, and Replit — across core positioning, backend infrastructure, built-in research, multi-model support, target user, Stripe payments integration, and pricing tiers. Atoms.dev leads with native backend and built-in research; Replit offers full-stack dev tooling; Lovable focuses on design-first UI generation. Source: Product with Attitude.