AI product teams that need non-engineers to safely edit and test production prompts.

PromptLayer is a hosted platform combining a visual prompt registry with version control, LLM call tracing, agent observability, and automated evaluations.

Accessed via PromptLayer's dashboard and SDK, wrapping calls to any LLM provider.

Operating since 2022 as one of the earliest LLM observability tools, actively updated through 2026.

It exists to let both engineers and domain experts iterate on and monitor prompts without redeploying code.

Integrates with OpenAI, Anthropic, and other providers via SDK wrappers or LiteLLM.

SaaS, proprietary, requires an API key; free and paid tiers; logged prompts and responses are sent to PromptLayer's cloud.