Langfuse vs LangSmith
Compare Langfuse and LangSmith for tracing, experiments, prompts, hosting and exports.
$20 per user / month. Payment required to activate your workspace.
Both connect traces, evaluations and prompts; the main choices are the review workflow and deployment model.
Langfuse
Open-source AI engineering with self-hosting options.
LangSmith
Connected tracing, evaluation and prompt engineering.
Also consider Lunary
For conversation review alongside application traces and prompts.
At a glance
| Question | Langfuse | LangSmith |
|---|---|---|
| Evaluation workflow | Datasets, scores, and experiments | Datasets, evaluators, and experiments |
| Prompt work | Versioned prompts and retrieval | Prompt engineering and testing |
| Deployment decision | Open-source self-hosting plus edition choices | Hosted and commercial self-hosting options |
| Archive options | Filtered UI and blob-storage exports | SDK queries and eligible bulk exports |
See your workflow in Lunary.
Explore conversations, traces and prompt versions with our team.
Compare the same prompt change
Run a baseline and candidate on the same dataset. Inspect regressions and individual results, then follow each failure back to its trace.
Self-hosting has different requirements
Langfuse documents an open-source deployment path. LangSmith offers commercial self-hosting; check edition, architecture and operating costs for both.
Check the export path
Langfuse supports UI and blob-storage exports. LangSmith supports SDK queries and bulk export, with plan and signup-date eligibility for the latter.
Questions & answers
Can both work with LangChain?
Evaluate each integration against your installed versions and the operations you need to trace.
Is this an independent benchmark?
No. Lunary wrote this comparison from official documentation; no comparative performance result is claimed.
By Lunary · Documentation reviewed Sep 16, 2026
Sources & methodology (11)
Based on vendor documentation, not an independent benchmark or hands-on rating. Features and plans can change.
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$20 per user / month. Payment required to activate your workspace.