Basejump is a SaaS starter tool that adds authentication, team and personal accounts, permissions for members, and subscription billing through Stripe to Supabase applications. Basejump can be integrated into existing projects using a single migration, which uses Supabase libraries in various programming languages, including JavaScript, Python Go, and Swift. The platform provides customizable React components based on shadcn, Tailwind CSS and enables rapid deployment while maintaining full control over the interface. Basejump uses Supabase Row Level Security (RLS), which enforces data access restrictions based upon user roles. This ensures secure and efficient permissions management. All data is stored in the user's Supabase databases, allowing for extensive customizations and extensions with additional tables if needed. Basejump can be used as a standalone billing and authentication system by developers because of its flexibility.