Vercel's Workflow Development Kit (WDK) and Inngest offer different approaches to building durable, production-ready workflows. Vercel's WDK simplifies the creation of durable workflows with a directive-based model that transforms code into isolated routes, but it requires using Vercel as the compute layer and lacks built-in coordination features crucial for complex, multi-tenant applications. In contrast, Inngest is a compute and language-agnostic orchestration platform that uses explicit function calls with step IDs, enabling more robust coordination, event-driven execution, and infrastructure independence. Inngest's architecture supports advanced capabilities like multi-tenancy, safe code evolution, and clear debugging, making it more suited for enterprise-level applications needing intricate coordination and scalability. By prioritizing explicit over implicit APIs, Inngest ensures type safety, testability, and observability, essential for maintaining stable and flexible production workflows.