Vellum Alternatives — Best Alternatives for 2026

LLM observability and evaluation platform from the LangChain team, tightly integrated with the LangChain framework for tracing, testing, and monitoring LLM applications.

Prompt management and observability platform focused on versioning, tracking, and evaluating LLM prompts with a lightweight integration approach.

LLM development platform offering prompt management, evaluation, and fine-tuning tools with a focus on continuous improvement through user feedback loops.

LLM experiment tracking and evaluation tools from W&B, extending their ML ops platform with prompt versioning, chain tracing, and model comparison features.