Product and engineering teams building and testing multi-step LLM applications collaboratively.

Vellum is a hosted LLM development platform offering a visual workflow builder, prompt/model evaluation suites, and CI/CD integration for testing changes before production.

Accessed via Vellum's web app and API, connecting to major model providers.

Added natural-language workflow generation in 2025 and continues active feature releases through 2026.

It exists to bridge technical and non-technical collaborators building production LLM applications end to end.

Connects to OpenAI, Anthropic, and other model providers plus retrieval and tool integrations.

SaaS, proprietary, requires an account/API key; usage-based and seat-based pricing; workflow data processed on Vellum's cloud.