Lunary vs PromptLayer
Updated March 10, 2026
Overview
Lunary is an open-source LLM observability platform for monitoring AI applications in production. It provides request tracing, cost tracking, user analytics, and prompt management with a clean dashboard. Lunary can be self-hosted for data privacy and offers a managed cloud option.
PromptLayer is a prompt management platform that provides version control, monitoring, and collaboration tools for LLM prompts. It logs every LLM request, tracks prompt templates, enables A/B testing across prompt versions, and provides a visual dashboard for prompt performance analytics.
Strengths and tradeoffs
What each tool does well, and the limitations to keep in mind.
Pros
- Production-ready platform
- Good performance
- Active development
- Strong features
Cons
- Enterprise pricing varies
- Setup complexity
- Learning curve required
Pros
- Production-ready
- Good performance
- Active development
Cons
- Pricing varies
- Setup required
Compare Lunary and PromptLayer on your own traffic
Respan lets you trace LLM and agent calls across any model or framework, A/B test prompts on production traffic, and route requests across 500+ models through one gateway.