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LangSmith Alternatives

4 alternatives to LangSmith — free and paid AI coding tools covering similar jobs, with pricing and standout strengths.

Full comparison: The Best LLM Observability Tools in 2026: Langfuse vs LangSmith vs Braintrust vs Phoenix

Looking for a LangSmith alternative? LangSmith is listed under Observability (freemium). The 4 tools below cover similar jobs, closest matches first — the table compares pricing, license, and platforms so you can shortlist quickly, and each entry further down adds a fuller summary and a link to the full profile.

ToolPricingLicensePlatformsCategory
Arize PhoenixfreeElastic-2.0—Observability
Langfuseopen sourceMIT (core; ee/ commercial)—Observability
Braintrustfreemium——Evaluation
Heliconeopen sourceApache-2.0—Observability

Free and open-source alternatives to LangSmith

LangSmith alternatives in detail

  1. Arize Phoenix

    freeElastic-2.0Observability

    Arize Phoenix is a source-available (ELv2) LLM tracing and evaluation tool built on OpenTelemetry/OpenInference. Run it locally in a notebook or self-host it to capture traces, run evals (including LLM-as-judge), and debug RAG and agent runs without sending data to a vendor.

    Read: The Best LLM Observability Tools in 2026: Langfuse vs LangSmith vs Braintrust vs Phoenix

    Read: Best LLM & RAG Evaluation Tools in 2026: DeepEval vs RAGAS vs LangSmith vs Phoenix vs promptfoo

  2. Langfuse

    open sourceMIT (core; ee/ commercial)Observability

    Langfuse is an open-source LLM engineering platform combining tracing, evaluations, prompt management, and cost/latency metrics. Self-host it or use the managed cloud; it's framework-agnostic and a popular open alternative to LangSmith.

    Read: Langfuse vs LangSmith: LLM Observability Compared (2026)

    Read: The Best LLM Observability Tools in 2026: Langfuse vs LangSmith vs Braintrust vs Phoenix

    Read: Best LLM & RAG Evaluation Tools in 2026: DeepEval vs RAGAS vs LangSmith vs Phoenix vs promptfoo

  3. Braintrust

    freemiumEvaluation

    Braintrust is a hosted platform that ties together LLM evaluation, a prompt playground, datasets, and production logging in one loop — write evals, iterate on prompts side by side, and watch real traffic, so the dev-and-monitor cycle lives in one place.

    Read: The Best LLM Observability Tools in 2026: Langfuse vs LangSmith vs Braintrust vs Phoenix

    Read: Best LLM & RAG Evaluation Tools in 2026: DeepEval vs RAGAS vs LangSmith vs Phoenix vs promptfoo

  4. Helicone

    open sourceApache-2.0Observability

    Helicone is an open-source LLM observability platform and AI gateway with a one-line integration — logging, tracing, caching, and cost/latency tracking across providers. Note: Mintlify acquired Helicone in March 2026 and it's now in maintenance mode (security, bug, and new-model updates continue), though the Apache-2.0 proxy still works and is self-hostable.

    Read: The Best LLM Observability Tools in 2026: Langfuse vs LangSmith vs Braintrust vs Phoenix