PromptLayer
Free tierThe collaboration layer for AI engineering teams — prompt CMS, eval harness, and observability stack
Free tier available·All audiences·API available
Key strengths
Prompt version control and CMS for managing prompt templatesEvaluation harness for testing and comparing LLM outputsFull observability stack for tracking LLM requests and performanceEnables non-engineers (domain experts) to iterate on prompts without code changesPurpose-built for AI engineering team collaboration
Free tier + paid plans
San Francisco, USA
Founded 2022
No ratings yet
PromptLayer is an AI engineering platform that provides a prompt CMS, evaluation harness, and observability stack for teams building LLM-powered applications. It sits as a middleware layer between your application and LLM providers, logging all requests and responses, enabling prompt versioning and A/B testing, and surfacing performance metrics. Engineers integrate via a lightweight SDK or API proxy, while non-technical collaborators interact through the visual dashboard to iterate on prompts and review evals.