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 versioning, registry, and visual CMS for non-technical collaborationLLM evaluation harness with dataset-backed tests, human review, and LLM-as-a-judge gradersAgent observability with production traces linked to prompt versionsCost, latency, and token usage monitoringCI/CD integration via SDK, REST API, and webhooksSOC 2 Type 2, HIPAA, and GDPR compliance
Free tier + paid plans · from $49 USD/mo
New York City, USA
Founded 2022
Self-hostable
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PromptLayer provides a REST API and SDK for programmatic access to all core platform features. Key integration points include:
- Prompt Registry & Versioning: Fetch, publish, and roll back prompt versions via API, enabling prompt management as part of automated deployment pipelines.
- CI/CD & Webhooks: Trigger evaluation runs and receive webhook callbacks on prompt publish events to gate releases on test results.
- Agent Observability: Instrument LLM calls to generate production traces that are automatically linked to the prompt version in use, supporting root-cause analysis across multi-step agent workflows.
- Evaluation Harness: Define dataset-backed test suites and configure LLM-as-a-judge or human review graders through the API.
- Cost & Performance Metrics: Per-request cost, latency, and token usage data are captured and queryable.
- Self-Hosting: The platform is open-source and self-hostable for teams with data-residency requirements.
- Compliance: SOC 2 Type 2, HIPAA, and GDPR certified.
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