> /v1/alternatives/langsmith
Open source alternatives to LangSmith[005]
LangSmith traces, evaluates and monitors LLM application runs with prompt versioning, datasets and human review. Below are 5 self-hostable open source alternatives, ranked by GitHub popularity.
Langfuse
Open source LLM engineering platform
★ STARS
26.8k
⑂ FORKS
2.7k
arize-phoenix
AI Observability & Evaluation
★ STARS
9.6k
⑂ FORKS
853
Helicone
LLM Observability for Developers
★ STARS
5.6k
⑂ FORKS
565
Agenta
The open-source LLMOps platform: prompt playground, prompt management, LLM evaluation, and LLM observability all in one place.
★ STARS
4.1k
⑂ FORKS
517
OpenLIT
Open source platform for AI Engineering: OpenTelemetry-native LLM Observability, GPU Monitoring, Guardrails, Evaluations, Prompt Management, Vault, Playground. Integrates with 50+ LLM Providers, VectorDBs, Agent Frameworks and GPUs.
★ STARS
2.4k
⑂ FORKS
273
// EDITOR'S TAKE
Langfuse is the obvious swap: tracing, prompt management, datasets and evals in one self-hostable service, framework-agnostic rather than tied to LangChain. arize-phoenix is stronger if evaluation and error analysis are the point and you live in notebooks, while Helicone is the least work to adopt because it sits as a proxy in front of your model calls, at the cost of shallower experiment tooling.
// FREQUENTLY ASKED
What is the best open source LangSmith alternative?
Langfuse is the most popular open source LangSmith alternative by GitHub stars (26,823 stars). The other 4 options are ranked above.
Are these LangSmith alternatives self-hostable?
Yes — every project listed here is open source and runs on your own infrastructure. Click into a project to see its license, stars, language, and current health status.
Are they free?
All projects shown are free and open source. Check each project's license page for the terms — most are MIT, Apache 2.0, or AGPL.