PromptLayer

source

closed

license

Apache-2.0(OSI, client library MagnivOrg/prompt-layer-library only)

platform

proprietary-SaaS(API-key gated, hosted prompt registry/logging/evals)

self-host

no(managed only)

Open client SDK over a closed hosted backend (prompt CMS, logging, evals are SaaS), no OSS core, so 'closed' alongside the Braintrust/LangSmith pattern; the open library is instrumentation only.

• https://github.com/MagnivOrg/prompt-layer-library recorded 2026-06-04

  Apache-2.0 official PromptLayer Python library; platform at promptlayer.com requiring API key