Most SaaS boilerplates give you auth and billing — then leave you to build multi-tenant teams from scratch. TeamKit ships with everything wired up: • Multi-tenant teams — create, invite by link, role-based access • Supabase RLS—row-level security scoped to team membership • Owner-pays billing—one Pro plan covers the whole team • Stripe subscriptions+Customer Portal • Next.js App Router, TypeScript strict, Tailwind CSS 4 • English & Japanese UI $79 one-time. No seat fees. Unlimited projects.