Vellum

About Vellum

Products by Vellum

All products by Vellum reviewed by our AI panel of experts.

VellumAI Agents & Assistants

A personal AI assistant that runs locally, learns your habits, and acts on your behalf

Free7.4/10

How Our Review Panel Scores Vellum

Six independent reviewer personalities assessed Vellum's product on their own terms. They disagreed by 1.6 points — The Finance Lead was the hardest to convince, The Power User the most positive.

Averaged across 1 reviewed product in our catalog. Scores are out of 10.

Competitive Landscape

Who Vellum competes with, and how they differ.

Braintrust8.0/10

Proprietary agent-observability and evaluation platform (tracing, LLM/code/human-scored evals, pattern discovery) rather than a prompt-engineering and workflow-building IDE; SOC 2/HIPAA-compliant and priced for enterprise AI teams past MVP stage.

1 product reviewed on TopReviewed

LangChain, Inc. (LangSmith)8.1/10

LangSmith is the code-first observability and eval layer for the widely-used open-source LangChain framework, serving developers who already build in code — a bottoms-up motion versus Vellum's visual/low-code interface built for both engineers and non-technical operators.

2 products reviewed on TopReviewed

Langfuse8.0/10

Open-source, self-hostable LLM engineering platform for tracing, prompt management and evaluation; competes on a developer-led, self-host adoption model against Vellum's closed-source, vendor-managed platform.

1 product reviewed on TopReviewed

Galileo.AI7.7/10

Enterprise GenAI evaluation and observability platform built around distilled "Luna" judge models for low-latency production guardrails; competes more on hallucination detection and governance than on Vellum's build/orchestration tooling.

1 product reviewed on TopReviewed

Flowise7.9/10

Open-source, self-hosted drag-and-drop builder for LLM and agentic workflows — the closest analog to Vellum's visual orchestration canvas, but without its evaluation suite or SOC 2/HIPAA enterprise compliance.

1 product reviewed on TopReviewed

Helicone.ai7.9/10

Narrower open-source LLM proxy focused on request logging, caching and cost monitoring; overlaps with only the observability slice of Vellum's platform rather than its prompt-engineering and orchestration scope.

1 product reviewed on TopReviewed

Company Timeline

Key milestones in Vellum's history, with sources.

1. Jan 13, 2026Launch

   Launched Vellum for Agents

   Vellum introduced a natural-language agent builder: users describe an automation in plain English and Vellum drafts a working AI agent, refined afterward inside the platform.

   vellum.ai
2. Jul 11, 2025Funding

   Series A — $20M led by Leaders Fund

   Vellum raised a $20 million Series A led by Leaders Fund, with participation from Socii Capital and returning investors Y Combinator, Rebel Fund, Pioneer Fund and Eastlink Capital. Customers cited include Drata, Swisscom, Redfin and Headspace.

   siliconangle.com
3. Jul 11, 2023Funding

   Seed round — $5M

   Vellum.ai closed a $5 million seed round with Rebel Fund, Eastlink Capital, Pioneer Fund, Y Combinator and angel investors; no lead investor was disclosed. At the time the company had roughly 40 paying customers with revenue growing 25-30% per month.

   techcrunch.com
4. January 2023Founded

   Founded by Akash Sharma, Noa Flaherty and Sidd Seethepalli

   The three co-founders previously worked together at Dover (a 2019 Y Combinator company), where they built generative-AI applications on GPT-3 starting in 2020; the friction they saw in prompt management and versioning led them to found Vellum after ChatGPT's release. The company went through Y Combinator's Winter 2023 batch.

   techcrunch.com