What are the best Vellum alternatives in 2026?
Quick Answer: As of April 2026, the leading Vellum alternatives are Langflow (open-source visual LangChain builder), LangSmith (LangChain observability and eval), Dust (workspace-grade AI assistants), Relevance AI (low-code AI agents), and Humanloop (prompt management and evaluation). Selection depends on whether teams need prompt eval, agent orchestration, or production deployment.
Vellum Alternatives in 2026
Vellum positions as a developer platform for production-grade LLM applications, covering prompt management, evaluation, and deployment. As of April 2026, four to five alternatives serve adjacent needs.
Langflow — Open-Source Visual Builder
Langflow is an open-source visual builder for LangChain flows. Free to self-host; managed hosting via DataStax. Strongest fit for teams that want a Figma-style canvas for chains and agents.
LangSmith — Observability and Eval
LangSmith from LangChain Inc. focuses on tracing, evaluation, and prompt management for production LLM apps. Pricing starts at $39/user/month for the Plus plan. Often paired with LangChain as the primary framework.
Dust — Workspace AI Assistants
Dust targets internal team assistants connected to Notion, Google Drive, Slack, GitHub, and Salesforce. Pricing starts at $29/user/month for the Pro plan. Strong fit for ops, support, and product teams.
Relevance AI — Low-Code AI Agents
Relevance AI builds AI agents and workforces via a visual builder. Suits revenue and ops teams that want autonomous agents without writing code.
Humanloop — Prompt Eval and Management
Humanloop focuses on prompt versioning, evaluation, and human feedback loops for LLM apps. Often used alongside other agent frameworks rather than as a full replacement.
Selection Summary
- Visual flow builder: Langflow
- LangChain-aligned eval: LangSmith
- Internal team assistants: Dust
- Low-code agents: Relevance AI
- Prompt management: Humanloop