vioscale
Comparison

PromptLayer vs Vellum

No clear leader: PromptLayer (70.2) and Vellum (66.9) are within the 5-point margin; treat as a tie. The attribute-by-attribute breakdown below, with a source and date on every value, is the honest way to compare them.

PromptLayer full profile →Vellum full profile →
Machine formatsJSONMarkdownGraphQLor send Accept: application/json
PromptLayer70
Vellum67
Score
Vioscale score
PromptLayer70 / 100medium · 54%
Vellum67 / 100low · 37%
Pricing
Free tier
PromptLayer✓
Vellum✓
Model
PromptLayerfreemium
Vellumfreemium
Price level
PromptLayermid
Vellummid
Starting price
PromptLayer$49
Vellum$30
Transparent
PromptLayer✓
Vellum✓
Integrations
Count
PromptLayer7
Vellum11
Security
Gdpr
PromptLayer✓
Vellum–
Hipaa
PromptLayer✓
Vellum–
Soc2
PromptLayer✓
Vellum–
Market
Availability

Capabilities

Feature-by-feature on the axes that matter for prompt management. “-” means undocumented, not absent.

Capabilities
Versioning model
PromptLayerGit native
Vellum-
Diff and rollback
PromptLayer✓
Vellum-
Deploy without redeploy
PromptLayer✓
Vellum-
Non engineer editing
PromptLayer✓
Vellum✓
Multi model playground
PromptLayer✓
Vellum-
Ab testing
PromptLayer✓
Vellum-
LLM judge or human eval
PromptLayer✓
Vellum-
Multi step flows
PromptLayer✓
Vellum✓
Approval workflow
PromptLayer✓
Vellum✓
Tracing included
PromptLayer✓
Vellum-
Self hostable
PromptLayer✓
Vellum-
Deployment model
PromptLayerManaged SaaS
VellumManaged SaaS
Pricing model
PromptLayerUsage/seat based saas
VellumUsage/seat based saas

What each one is

The product in its own terms, so the numbers below have context.

PromptLayer

A platform combining prompt versioning, evaluation tools, and observability for LLM applications. It enables domain experts to test and refine prompts, track API usage and costs, and monitor application performance—all without changing application code.

Independently observed

Vellum

A cloud-based AI assistant that maintains continuous context about your preferences and history, accessible via web, desktop, mobile, and messaging platforms, capable of automating tasks like email, calendar management, and web browsing with your explicit approval for each action.

Independently observed

Pricing

List pricing as published by each vendor, with the date we read it. Always verify at the source before you buy.

PromptLayer

from $49/moHybridFree tier

Free tier available. Pro starts at $49/month, Team at $500/month, both with usage-based billing ($0.002–$0.003 per transaction). Enterprise custom pricing.

  • FreeFree
    • 5 Users
    • 2.5k/month Requests
    • 1 Workspace
    • 250/month Eval Cell Executions
    • 10MB max per Dataset
    • +1 more
  • Pro$49/month plus $0.003/transaction
    • Unlimited Playgrounds
    • Unlimited Workspaces
    • 150MB max per Dataset
    • Webhooks Included
    • Dedicated Support
  • Team$500/month plus $0.002/transaction
    • 25 Users
    • 100k+/month Requests
    • 7.5k+/month Eval Cell Executions
    • 1GB max per Dataset
    • Webhooks Included
    • +2 more
  • EnterpriseContact sales
    • Custom limits on everything
    • Role Based Access Controls
    • Deployment Approvals
    • HIPAA with BAA
    • Flexible Hosting Options
    • +2 more
as of verify ↗

Vellum

from $30/moHybridFree tier

Free tier with credits, paid plans from $30/mo

  • FreeFree
    • Free starter credits
    • Multi-platform access
    • Memory and context
  • Paid$30/mo
    • Larger machine
    • More storage
    • Bundled credits
as of verify ↗

Platform & deployment

Where each product runs and how it can be hosted. A dash means undocumented, not unsupported.

Platforms
Web
PromptLayer✓
Vellum✓
iOS
PromptLayer✗
Vellum✓
macOS
PromptLayer✗
Vellum✓
CLI
PromptLayer✓
Vellum✓
Deployment
Cloud / SaaS
PromptLayer✓
Vellum✓
Self-hosted
PromptLayer✓
Vellum✗
On-premise
PromptLayer✓
Vellum✗
Hybrid
PromptLayer✓
Vellum✗

Integrations

What each product connects to. Counts come from the vendor's own integration directory where one exists.

PromptLayer

8 total
  • Pydantic AI
  • OpenAI
  • Anthropic
  • Google GenAI
  • AWS Bedrock
  • OpenTelemetry
  • Azure OpenAI
  • Vertex AI
Independently observed

Vellum

11 total
  • Gmail
  • Google Calendar
  • Slack
  • Telegram
  • Web browsing
  • Computer control
  • Phone calls
  • Image generation
  • Coding
  • App building
  • Task management
Independently observed

Comparison generated from independently-sourced facts. Every value links to its source and retrieval date. See the method.