LangSmith offers Free Trial, but Zep does not.
The starting price of LangSmith begins at $0.5/month, while pricing details for Zep are unavailable.
LangSmith offers several advantages, including Observability for LLM apps, Testing for LLM apps, Open-source SDK, Flexible integration, Adaptable to different implementations and many more functionalities.
The cons of LangSmith may include a Limited to LLM applications, Restricted early access, Beta version risks, Relies on flexible adaptation. and No mention of cross-platform compatibility