PromptLayer
Partial infoPrompt management, versioning, and evaluation platform.
PromptLayer lets teams manage prompts as versioned assets with a visual registry, A/B testing, evaluation, and request logging, so prompts can change without redeploying code. It suits collaboration between engineers and non-engineers.
License
Proprietary
Deployment
Managed
Pricing
Free tier; per-seat and usage-based paid plans.
SDKs / languages
Python, JavaScript
Founded
2022
Strengths
- Prompt registry with versioning
- Non-engineers can edit prompts
- Logging + A/B testing
Limitations
- Proprietary managed service
- Adds a dependency to your prompt flow
Alternatives
Agenta
Open-source LLMOps: prompt playground, evals, and observability.
Braintrust
Eval-first platform for iterating on LLM quality.
Langfuse
Open-source LLM observability, evals, and prompt management.
LangSmith
Tracing, evals, and prompt management from the LangChain team.
Latitude
Open-source prompt engineering and evaluation platform.
Mirascope
Pythonic library for prompts as typed functions.
Facts verified 19 July 2026. Neutral summary, not an endorsement; verify current details with the vendor.