Mendix

Mendix uses model-driven development to let enterprises design internal apps by defining data models and then generating the interfaces, workflows, and business logic on top of them. The platform covers the full stack from database design through deployment, and large companies can spend months on a single application that touches hundreds of internal users across departments.

Teams appreciate the structured data-first approach, though setup and deployment require Mendix expertise that's less common than Retool developers. It's best suited to fortune 500 companies building internal applications that stay in place for years and need to scale to thousands of concurrent users.