I kept Googling "X vs Y" and getting the same SEO-spam listicles that say nothing useful. So I built Simily — type any two things and get an actual AI-powered breakdown. What it does Category-by-category scores (Performance, Price, Ease of Use, etc.) Pros & cons for each option A clear winner with reasoning FAQ section for common questions You can add up to 5 items to compare at once Try it: ChatGPT vs Claude The stack Frontend: Next.js 16 App Router, Tailwind CSS v4, TypeScript AI: Anthropic Claude API (claude-sonnet) — I send a structured prompt and ask it to return JSON with scores, pros/cons, and FAQs. Works surprisingly well. Caching: Upstash Redis with a 7-day TTL. First person to run a comparison pays the API cost, everyone after gets it instantly for free. This keeps costs very low. Deployment: Vercel The interesting part — the prompt Getting Claude to return consistent JSON was the main challenge.…