PromptLayer

PromptLayer is a platform that combines prompt management, evaluation, and observability for teams building applications on top of large language models. Its prompt registry works as a visual, no-code editor, letting people edit, version, and deploy prompt changes without waiting for a full application redeploy — which also means non-technical domain experts can adjust prompt wording directly instead of routing every change through engineering. For quality control, the platform runs dataset-backed evaluations that combine human review with automated graders, useful for catching regressions when a prompt or model is changed. On the production side, it traces agent runs and logs cost, latency, and token usage, and connects those logs back to the specific prompt version that generated them, which helps teams diagnose where an application is underperforming. PromptLayer supports models and frameworks from OpenAI, Anthropic, Google Gemini, Azure OpenAI, and Mistral, along with LangChain, LlamaIndex, and the Vercel AI SDK, among other integrations. It is used by companies including ByteDance, Accenture, DocuSign, Gorgias, and Speak, and the company states SOC 2 Type 2, HIPAA, and GDPR compliance. The site does not publish self-serve pricing directly, instead directing visitors to sign up for a free account or request a demo, so exact plan costs require contacting PromptLayer.