Best Self-Hosted LangSmith Alternatives in 2026

Why Look for LangSmith Alternatives?

LangSmith is a developer platform for debugging, testing, monitoring, and evaluating LLM applications built with LangChain.

Self-hosted alternatives give you full data ownership, predictable costs, and zero vendor lock-in. You run the software on your own infrastructure and control everything.

4 Best Open-Source Alternatives to LangSmith

Langfuse

LLM engineering platform for model tracing, prompt management, and application evaluation. Langfuse helps teams collaboratively debug, analyze, and iterate on their LLM applications such as chatbots or AI agents — 23,210 GitHub stars. Licensed under MIT.

Read full Langfuse review

OpenLLMetry

Open-source observability platform for LLMs using OpenTelemetry. Monitor performance, track costs, and debug AI applications with just 2 lines of code. — 6,918 GitHub stars. Licensed under Apache-2.0.

Read full OpenLLMetry review

Helicone

Open-source platform for logging, monitoring, and debugging LLM applications. Route, debug, and analyze AI apps with comprehensive observability tools. — 5,254 GitHub stars. Licensed under Apache-2.0.

Read full Helicone review

Agenta

LLMOps platform for prompt management, LLM evaluation, and observability. Build, evaluate, and monitor production-grade LLM applications with collaborative prompt engineering — 3,932 GitHub stars. Licensed under MIT.

Read full Agenta review

Why Self-Host Instead of LangSmith?

• Data ownership. Your data stays on your server, not on LangSmith’s infrastructure.
• Predictable costs. Pay a fixed VPS cost instead of growing per-user or per-usage fees.
• No vendor lock-in. Export and migrate your data anytime. You control the database.
• GDPR and compliance. Hosting your own tools simplifies data residency and compliance requirements.