PromptLayer is a prompt engineering platform for teams building AI products. It gives you a prompt registry to version and edit prompts without code, evaluations to test them, and observability to track every LLM request. There is a free plan, and the Pro plan costs $49 a month.
What is PromptLayer?
PromptLayer sits between your app and AI models such as OpenAI, Anthropic and Google. It logs every request and response, so you can see what your prompts are doing, how much they cost and how fast they run.
Its visual prompt registry lets non-technical teammates, like product managers or domain experts, edit and test prompts without touching the codebase. Evaluations help you compare prompt versions before you ship them.
PromptLayer key features
Prompt registry
Store, version and manage prompts like a CMS.
Visual editor
Edit prompts and templates without changing code.
Version control
Compare versions and roll back safely.
Evaluations
Test prompts on datasets and score the results.
Observability
Log and search every LLM request and response.
Cost and latency tracking
Monitor spend and speed across models.
A/B testing
Release prompt versions to part of your traffic.
Agent workflows
Build and test multi-step AI agents.
Multi-model support
Works with OpenAI, Anthropic, Google and more.
PromptLayer pricing plans (2026)
PromptLayer has a free plan for small projects and paid plans for growing teams.
Free
Limited requests, prompts and short data retention for testing.
Pro
More requests, unlimited prompts and longer history for small teams.
Team
Higher limits, more seats and collaboration for larger teams.
Prices checked in October 2026 (USD). Extra requests may be billed as overage, and Enterprise plans with self-hosting are custom. Confirm on the official PromptLayer pricing page.
How to use PromptLayer
- 1
Go to promptlayer.com and sign up for free.
- 2
Install the Python or JavaScript SDK and add your API key.
- 3
Create a prompt template in the prompt registry.
- 4
Run your app and review requests in the dashboard.
- 5
Set up evaluations to test new prompt versions before release.
Who should use PromptLayer?
AI engineers
Track and debug LLM calls in production.
Product managers
Edit prompts without waiting for code changes.
Prompt engineers
Version, test and compare prompts.
Startups
Ship AI features faster with less risk.
Pros and cons
What we like
- Easy prompt versioning and editing
- Lets non-developers improve prompts
- Good logging and cost tracking
- Free plan to start
Watch out for
- Pro plan is pricey for solo users
- Large jump in price to the Team plan
- Needs some setup with SDKs
- Mostly useful for teams building AI apps
Best PromptLayer alternatives
PromptLayer is a strong prompt management tool for teams building AI products. It makes prompts easy to version, test and monitor, and lets non-engineers help. Start free, then move to Pro when your app is in production.
PromptLayer FAQs
What is PromptLayer?
PromptLayer is a platform to manage, version, evaluate and monitor AI prompts and LLM requests.
Is PromptLayer free?
Yes. PromptLayer has a free plan with limited requests and data retention.
How much does PromptLayer cost?
The Pro plan costs about $49/month and the Team plan about $500/month. Enterprise is custom.
Which AI models does PromptLayer support?
It works with major providers such as OpenAI, Anthropic and Google.
Do I need to code to use PromptLayer?
Developers set up the SDK, but non-technical teammates can edit prompts in the visual editor.
What are good PromptLayer alternatives?
Popular alternatives include LangSmith and the open-source Langfuse.
