tl;dr: Hacker Trends is a Google Trends–style tool that charts how often topics, tools, or people appear across 18 years of Hacker News posts and comments, built on a date-histogram over 45M items using Upstash Redis Search. Users can overlay multiple terms to compare traction over time and drill down into the underlying stories and comments. The site includes curated comparisons illustrating shifts like Webpack→Vite, MySQL→Postgres, TensorFlow→PyTorch→JAX, and Cursor→Claude Code→Codex.