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Head-to-head · Llm Developer Tools

LangSmith vs Haystack

  • Updated Oct 2026
  • Both researched from official sources
  • 2 checks side by side
Higher score LangSmith #1 in Llm Developer Tools 9.4/10 Free plan Free plan✓ 0 of 3 features Visit LangSmith
Haystack #3 in Llm Developer Tools 9.1/10 Open source ✓ 1 of 3 features Visit Haystack

LangSmith leads on 0 checks, Haystack on 1, and 1 is even. Who comes out ahead on the 2 yes/no, price and count checks where we have data for both products. The editor score weighs everything else too.

Our verdict

  • Highest scoreLangSmith · 9.4/10
  • Free planonly LangSmith
  • Most featuresHaystack · 1 of 3

LangSmith scores higher on our rubric for llm developer tools: 9.4 against 9.1 out of 10; our editors rank them #1 and #3.

Haystack offers open source; LangSmith doesn't.

LangSmith is the better fit for teams needing complete LLM observability and evaluation. Haystack is the better fit for production RAG and retrieval pipeline teams.

  • LangSmith fits best

    Teams needing complete LLM observability and evaluation

  • Haystack fits best

    Production RAG and retrieval pipeline teams

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Side by side

Feature LangSmith 9.4/10 Visit ↗ Haystack 9.1/10 Visit ↗
At a glance
Editor score 9.4 9.1
Ranking #1 in Llm Developer Tools #3 in Llm Developer Tools
Best for Teams needing complete LLM observability and evaluation Production RAG and retrieval pipeline teams
Pricing model Free plan + paid Free
Starting price $39/seat/mo Open source
Free plan ✓ (best) Not checked yet
Free trial — —
Deployment Cloud, Self-hosted Self-hosted
Support Community, Email, Tickets, Docs · 24/7 Community, Docs
Integrations 7 integrations 183+ integrations
Built for Solo, Small business, Mid-market, Enterprise Solo, Small business, Mid-market, Enterprise
Features LangSmith 0/3 · Haystack 1/3
LLM evaluation Not checked yet Not checked yet
LLM observability Not checked yet Not checked yet
Open source — ✓ (best)
Specs
Deployment Both Not checked yet
LLM providers Not checked yet Not checked yet
SDK languages Not checked yet Not checked yet
Our review
Pros
  • Combines application tracing, evaluations, prompt versioning, and monitoring.
  • Tracks agent and tool calls and supports online and offline evaluations.
  • Offers cloud, hybrid, and self-hosted deployment options.
  • Combines keyword and embedding search with configurable reranking.
  • Builds RAG answers with referenced documents and metadata.
  • Supports 183 integrations across models, databases, and monitoring tools.
Cons
  • Developer includes one seat and up to 5k base traces per month.
  • Developer and Plus charge pay-as-you-go after their included trace allowances.
  • Enterprise pricing is custom.
  • Requires development work to compose and run pipelines.
  • The framework is self-hosted rather than a metered hosted service.
  • Support channels for the framework are community and documentation.
Our verdict

LangSmith brings development, evaluation, and monitoring tools for LLM applications and agents into one platform. It is aimed at teams that want to inspect application traces, compare experiments, manage prompts, and monitor production…

Read the review →

Haystack is an open-source Python framework from deepset for building LLM applications, RAG systems, AI agents, multimodal applications, and semantic search pipelines. Its reusable components and composable workflows suit developers who…

Read the review →
  1. LangSmithLlm Developer Tools 9.4Free plan
  2. HaystackLlm Developer Tools 9.1Open source

Strengths and trade-offs

  • LangSmith — where it wins

    • Combines application tracing, evaluations, prompt versioning, and monitoring.
    • Tracks agent and tool calls and supports online and offline evaluations.
    • Offers cloud, hybrid, and self-hosted deployment options.

    Where it doesn't

    • Developer includes one seat and up to 5k base traces per month.
    • Developer and Plus charge pay-as-you-go after their included trace allowances.
    • Enterprise pricing is custom.

  • Haystack — where it wins

    • Combines keyword and embedding search with configurable reranking.
    • Builds RAG answers with referenced documents and metadata.
    • Supports 183 integrations across models, databases, and monitoring tools.

    Where it doesn't

    • Requires development work to compose and run pipelines.
    • The framework is self-hosted rather than a metered hosted service.
    • Support channels for the framework are community and documentation.

More comparisons

All llm developer tools comparisons → · Full ranking →

Reviewed by iTechGuides Editors · Editorial team · Updated Oct 2026

Last updated · How we research and update