Best LangSmith alternatives.
Live source-backed alternatives to LangSmith for Eval frameworks. Alternatives are selected from the same task category and update whenever the best-of index rebuilds.
LangSmith
Official LangSmith documentation for LLM evaluation, observability, traces, datasets, prompt testing, and production quality monitoring. official_service llm evaluation eval framework observability quality monitoring benchmark framework text api hosted sdk tracing datasets prompt testing monitoring
Braintrust
Matched eval framework, llm evaluation, llm eval; 2 source links; official service signal; access model: Paid API
Thomeras/agent_detective
Matched eval framework, llm evaluation, llm eval; 1 source link; access model: Open source; open weights signal
| # | Alternative | Kind | Access | Fit | Why it appears | Source |
|---|---|---|---|---|---|---|
| 01 | Braintrust | service | Paid API | Score91 | Matched eval framework, llm evaluation, llm eval; 2 source links; official service signal; access model: Paid API | braintrust.dev |
| 02 | Thomeras/agent_detective | repo | Open source | Score67 | Matched eval framework, llm evaluation, llm eval; 1 source link; access model: Open source; open weights signal | github.com |
| 03 | BlazeUp-AI/Observal | repo | Open source | Score61 | Matched llm evaluation, llm eval, observability; 1 source link; access model: Open source; open weights signal | github.com |
| 04 | Therealdk8890/DProvenanceKitPython | repo | Open source | Score58 | Matched llm evaluation, llm eval, observability; 1 source link; access model: Open source; open weights signal | github.com |
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