Building Structured Product Comparisons with Next.js and AI

How we built SmartReview's comparison engine to serve 50K+ monthly "X vs Y" searches — and what we learned along the way. If you've ever searched "AirPods vs Sony WF-1000XM5" or "Roomba vs Roborock," you've seen comparison content. Most of it is mediocre — walls of text that don't actually help you decide. We built SmartReview to fix that. Here's the technical architecture behind our AI-powered comparison engine. The Problem Comparison searches ("X vs Y") represent a massive, underserved search intent: "AirPods vs Sony" — 50,000+ monthly searches "Roomba vs Roborock" — 30,000+ monthly searches "Nespresso vs Keurig" — 25,000+ monthly searches Users want structured, scannable answers — not 2,000-word essays. They want to know: which one should I buy, and why? Architecture Overview ┌─────────────────────────────────────────────┐ │ Discovery Layer (DataForSEO + Tavily) │ │ → Identifies high-volume "vs" keywords │ │ → Scores by volume × (100 - difficulty) │ └──────────────┬─────────────────