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Vellum

Visual LLM workflow builder with evaluations, versioning, and production deployment.

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About

Vellum combines a visual workflow builder with prompt versioning, a strong evaluation suite (side-by-side model comparison, 500+ test cases in minutes), and production deployment with monitoring — aimed at product/engineering teams shipping AI features, including non-technical stakeholders.

Pricing is the catch: free tier (50 prompts/day) jumps straight to Pro at $500/mo — the steepest jump in the category, with no middle tier. Customers at Redfin and Headspace cite support quality. Closed-source; VPC/on-prem only on Enterprise.

What it can do

  • Visual LLM workflow builder
  • Evaluation suite with side-by-side comparison
  • Prompt versioning with instant rollback
  • Production deployment + monitoring
  • Multi-user workspaces with RBAC

Setup

  1. Sign up at vellum.ai (free tier).
  2. Build workflows in the visual canvas or via SDK.
  3. Define test cases and run the evaluation suite.
  4. Deploy to a hosted endpoint; monitor in production.

Prerequisites

Vellum account (free tier); team budget for Pro ($500/mo) if going to production.

Use cases

codeautomation

Works with

Generic APIAny agent (.md)

Trust score — 6/10

/10 trustMetrics-checked

Scored 6/10 (metrics tier). Strong evaluation suite and real enterprise customers per reviews, but closed-source with the category's steepest pricing jump ($0 → $500/mo) and no self-hosting below Enterprise. Good for funded teams, poor value otherwise. Metrics tier.

How the trust score is built

Full methodology →
Adoption · stars/downloads, log-scaled vs peers
7.0/10
Maintenance · recency, releases, issue load
5.0/10
Openness · license + docs
4.5/10
Manual review · sanity read + red-flag check
7.0/10
  • · provider-tier estimate — thinner evidence (no public adoption metric)
  • · used by Redfin/Headspace per reviews; steep pricing signals enterprise focus — provider-tier estimate
  • · no release date — neutral maintenance score
  • · manual review: strong eval suite per reviews; $500/mo Pro jump is the steepest in category; overkill for MVPs; license: closed SaaS

Sources

Every fact above was checked against these sources. Where a claim comes from the provider and couldn't be independently verified, the text says so.