NextBlock is an open-source, full-stack CMS built on Next.js 16 & Supabase. Ditch headless boilerplate with a Notion-style Tiptap block editor, strict JSONB storage, and 100/100 Lighthouse defaults. Includes runtime theming (zero redeploys), hybrid commerce (Stripe + Freemius), and Cortex AI with BYOK & remote MCP tool-calling for Claude, Cursor & ChatGPT. Deploy in 60s with 1-click Vercel, CLI, or Docker. Try the live sandbox at nextblock.dev 🚀