PromptLayer

PromptLayer is an AI engineering platform providing prompt management, evaluation, and observability for teams building LLM applications, used by enterprise customers including ByteDance, Accenture, and DocuSign. Its visual editor lets teams version, test, and deploy prompts without code changes; evaluations run against test datasets with human review and automated grading before anything reaches production; and observability connects live traces back to specific prompt versions, tracking cost, latency, and token usage per request. It also supports agent workflow tracing and A/B testing across multiple LLM providers. A free tier exists to get started, with paid tiers for larger teams — exact pricing isn't published on the main page. SOC 2 Type 2 compliance (achieved by 2025) supports enterprise adoption. Good fit for a team that wants prompt changes to go through the same rigor as code changes — versioned, tested, and monitored — rather than edited ad hoc in a chat window.