Supabase integration in ToolJet offers developers an open-source alternative to Firebase for real-time data handling and user authentication. ToolJet simplifies Supabase workflows by managing databases, authentication, and querying with minimal backend effort. Developers use Supabase with ToolJet to build real-time dashboards, user management systems, and custom backend solutions for web and mobile apps, making it a great option for developing full-stack applications.