PromptLayer vs Vellum
On the evidence we track, PromptLayer leads this comparison with a composite score of 63/100. Scores are only directly comparable because these tools share a category; the full breakdown and every source is below.
Capabilities
Feature-by-feature on the axes that matter for prompt management. “-” means undocumented, not absent.
What each one is
The product in its own terms, so the numbers below have context.
PromptLayer
LeaderA platform that maintains logs of prompts and API requests, enabling debugging and replay of previous completions. Provides version tracking, testing, and monitoring with integrated tracing and evaluation features.
Vellum
A personal AI assistant that runs locally or in the cloud, maintains long-term memory, automates tasks across your tools and files, and is available across all your devices.
Pricing
List pricing as published by each vendor, with the date we read it. Always verify at the source before you buy.
PromptLayer
LeaderFree 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
Vellum
Free to download and run locally, or from $30/month for cloud hosting
- Free (Local)Free
- Mighty$30/mo
- Super$100/mo
- Ultra$200/mo
Platform & deployment
Where each product runs and how it can be hosted. A dash means undocumented, not unsupported.
Integrations
What each product connects to. Counts come from the vendor's own integration directory where one exists.
PromptLayer
Leader- Pydantic AI
- OpenAI
- Anthropic
- Google GenAI
- AWS Bedrock
- OpenTelemetry
- Azure OpenAI
- Vertex AI
- Gemini API
Vellum
- Gmail
- Google Calendar
- Slack
- Telegram
- Web browsing
- Computer control
- Phone calls
- Image generation
- Coding
- App building
- Task management
- Google Workspace
- Notion
PromptLayer or Vellum: which one depends on you
A composite score cannot know your constraints. Describe them and both get re-weighted against what you actually need, with the evidence behind every position.
Free to run, no account needed to start. How the evaluation works
Comparison generated from independently-sourced facts. Every value links to its source and retrieval date. See the method.