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Vellum in brief
A solid platform for teams building production LLM apps that need prompt experimentation, evaluation, and monitoring built in.
- PriceFree (Pro from $100/month)
- CategoryMCP & Infra
- RecommendedYes
The essentials
- LLM development platform for production (prompts, testing, monitoring)
- Free plan available, Pro from $100/month
- Workflow builder for agents and LLM chains
- Focused on rigor: evaluation, prompt versioning, regression testing
What is Vellum?
Vellum covers the full development cycle of an LLM app: prompt experimentation, workflow building, systematic evaluation, deployment, and production monitoring. The core value prop is rigor — prompt versioning, A/B testing across models, output quality evaluation on test datasets, live performance monitoring. It's the platform teams use when they actually care about LLM output quality and want a structured dev workflow.
Strengths
Prompt versioning and experimentation
Full version control for prompts with performance comparisons across versions. Essential for teams iterating on production prompts.
Systematic evaluation
Vellum lets you create test datasets and automatically evaluate LLM outputs against defined criteria. Catches regressions when you update models or prompts.
Workflow builder for agents
Build multi-step workflows with LLMs, tools, and conditions. Less code than LangChain, more flexibility than Zapier.
Limits
Expensive for small teams
The free plan is limited. $100/month for Pro is steep for an early-stage startup.
Learning curve
The platform is feature-rich. Getting full value — especially from evaluations and monitoring — takes real time to set up.
Pricing
Free plan with limits. Pro from $100/month. Enterprise pricing on request. Check vellum.ai/pricing.
Alternatives
Vellum = full production LLM development. LangSmith (smith.langchain.com) = $39/month, direct competitor in the LangChain ecosystem. Langfuse (langfuse.com) = open source, self-hostable, LLM monitoring.
Verdict
Vellum is the pick for product and engineering teams building production LLM apps with quality requirements. The versioning, evaluation, and monitoring workflow is one of the most complete on the market. For a very early startup or a research project, open source alternatives like Langfuse are a better fit.
FAQ
Which LLMs does Vellum support?
OpenAI, Anthropic, Cohere, Mistral, and others via API. Vellum is LLM-provider agnostic.
Can you fine-tune through Vellum?
Vellum supports fine-tuning via providers that offer it (OpenAI mainly). Fine-tuning dataset management is built in.
Does Vellum replace LangChain?
Not directly. Vellum is an LLM operations and management platform. LangChain is a development framework. The two can coexist.
Is there a Vellum API to integrate into my code?
Yes, Vellum has an API and Python and TypeScript SDKs for integrating deployed workflows into applications.
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Screenshots Vellum
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Vellum : 0/10.
A solid platform for teams building production LLM apps that need prompt experimentation, evaluation, and monitoring built in..
Test Vellum yourself
A free trial is available. Plan thirty minutes to form your own opinion.
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Vellum
Free (Pro from $100/month)