PromptLayer

PromptLayer is a prompt management, evaluation and observability platform for teams building with large language models. It positions itself as the collaboration layer between engineers and domain experts, so that product, content and subject matter specialists can edit prompts without touching the application code. The platform has three parts. The Prompt Registry offers a visual, no code editor to write, version, test and deploy prompts, decoupling prompt releases from application deployments. Evaluations run dataset backed tests, human review and automated graders, including regression sets, before a prompt or workflow change reaches production. Agent observability connects production traces to prompt versions, and lets teams inspect failures, logs and tracing while tracking cost, latency and token usage. It is aimed at AI engineering teams, and its customer stories describe support automation, education grading, legal AI and newsroom agents. Pricing is published in four tiers. Free costs $0 per month for 5 users, 2.5k requests a month, 1 workspace, 250 eval cell executions a month and 10MB per dataset. Pro costs $49 per month, adds unlimited playgrounds and workspaces, 150MB datasets and pay as you go usage at $0.003 per transaction. Team costs $500 per month for 25 users, 100k or more requests a month, 7.5k or more eval cell executions, 1GB datasets, webhooks and usage at $0.002 per transaction. Enterprise is custom priced and adds role based access control, deployment approvals, SSO, HIPAA with a BAA, self hosted or managed single tenant hosting and dedicated support.