PromptLayer
promptlayer.com
Platform for logging, managing, and evaluating LLM prompts.
Quick Information
- Category:
- Coding
- Pricing:
- Freemium
- Platforms:
- Web, API
- Free Plan:
- Yes
- API Available:
- Yes
- Last Verified:
- September 2026
What Is PromptLayer?
PromptLayer is an AI engineering platform combining a prompt registry and visual prompt CMS with LLM evaluations, observability, and agent tracing, letting engineering teams version, test, deploy, and monitor prompts in production. Pricing includes Free ($0, 5 users, 2,500 requests/month), Pro ($49/month with pay-as-you-go overage at $0.003/transaction), Team ($500/month, 25 users, 100,000+ requests/month, overage at $0.002/transaction), and custom Enterprise pricing.
Its ability to connect production logs and traces directly to specific prompt versions and evaluation scores is a genuinely practical capability for engineering teams, since it lets them measure objectively whether a given prompt change actually improved behavior in production — rather than relying on subjective impressions or ad hoc testing when iterating on prompts.
It's aimed at engineering teams building production LLM applications who need to version prompts, evaluate changes objectively, and monitor cost, latency, and quality in real time, with the free tier's 2,500 monthly requests providing genuine capability for small projects or evaluation before scaling into Pro or Team tiers as request volume and team size grow. See our AI Infrastructure directory for related tools like Langfuse and Helicone.
What Can You Use PromptLayer For?
Prompt versioning and registry
Versions and manages prompts through a centralized registry and visual CMS.
LLM observability
Observes requests, spans, cost, and latency for production LLM applications in real time.
Prompt evaluation
Evaluates prompt changes against production logs and traces to measure behavioral improvement.
PromptLayer Features
- Visual prompt CMS — Provides a visual interface for managing and versioning prompts.
- Real-time observability — Monitors requests, spans, cost, latency, and custom metrics in real time.
- Evaluation-to-production linkage — Connects production logs and traces directly to prompt versions and evaluation scores.
Who Is PromptLayer For?
- AI engineering teams — Uses prompt versioning, evaluation, and observability to manage production LLM applications.
- Larger organizations — Uses Team or Enterprise tiers for higher request volumes and more users.
PromptLayer Pros & Limitations
What We Like
- Genuinely practical linkage between production logs and prompt versions for objective evaluation
- Free tier provides real capability (2,500 requests/month, 5 users) for small projects
- Comprehensive feature set spans prompt registry, evaluation, and observability in one platform
Limitations
- Team tier ($500/month) required for larger user counts and request volumes
- Pay-as-you-go overage charges apply beyond included request limits on Pro and Team
- Enterprise pricing requires custom quotes for the largest deployments
PromptLayer Pricing
| Plan | Price | Main Features |
|---|---|---|
| Free | $0 | 5 users, 2,500 requests/month |
| Pro | $49/month | Pay-as-you-go overage at $0.003/transaction |
| Team | $500/month | 25 users, 100,000+ requests/month, overage at $0.002/transaction |
| Enterprise | Custom | Full feature set, custom deployment |
Pricing was last verified September 2026. Check the official website for the latest pricing.
AI Listing Jungle Ranking
- Global Rank:
- #779
- Overall Score:
- 10.3/100
- Monthly Users:
- –
- Rank Change:
- ▲ 1
This ranking reflects AI Listing Jungle's own independent scoring methodology and is not an endorsement by PromptLayer or its company. How Our Rankings Work
Frequently Asked Questions
Is PromptLayer free?
Yes, with 5 users and 2,500 requests/month on the free tier.
How much does PromptLayer cost?
From $49/month (Pro) up to $500/month (Team), plus custom Enterprise pricing.
What does PromptLayer track?
Requests, spans, cost, latency, scores, tokens, and custom key-value pairs.
Can I evaluate prompt changes?
Yes, it connects production logs and traces to prompt versions and evaluation scores.
Our Take
PromptLayer's linkage between production logs and specific prompt versions provides genuinely objective evidence of whether a prompt change improved behavior, rather than relying on subjective judgment.
The free tier's 2,500 monthly requests offer real testing capability before committing to Pro or Team pricing.
PromptLayer Alternatives
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