ProofMatcher: Free UI Component Library 2026 ProofMatcher is a free UI component library with 273+ components across 10 categories. Every component ships with HTML, CSS and React code. No sign-up, no paywall, free for commercial use forever. Why Developers Use ProofMatcher No installation — copy and paste directly into any project No dependencies — pure HTML, CSS and React with no libraries No account required — open the site, copy the code, done Commercial license — use in client projects, SaaS