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Head-to-head · Llm Developer Tools

Haystack vs Langfuse

  • Updated Oct 2026
  • Both researched from official sources
  • 2 checks side by side
Higher score Haystack #3 in Llm Developer Tools 9.1/10 Open source ✓ 1 of 3 features Visit Haystack
Langfuse #7 in Llm Developer Tools 8.7/10 Free plan Free plan✓ 1 of 3 features Visit Langfuse

Haystack leads on 0 checks, Langfuse on 0, and 2 are 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 scoreHaystack · 9.1/10
  • Free planonly Langfuse

Haystack scores higher on our rubric for llm developer tools: 9.1 against 8.7 out of 10; our editors rank them #3 and #7.

Haystack is the better fit for production RAG and retrieval pipeline teams. Langfuse is the better fit for teams needing affordable full-stack LLM tracing.

  • Haystack fits best

    Production RAG and retrieval pipeline teams

  • Langfuse fits best

    Teams needing affordable full-stack LLM tracing

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Side by side

Feature Haystack 9.1/10 Visit ↗ Langfuse 8.7/10 Visit ↗
At a glance
Editor score 9.1 8.7
Ranking #3 in Llm Developer Tools #7 in Llm Developer Tools
Best for Production RAG and retrieval pipeline teams Teams needing affordable full-stack LLM tracing
Pricing model Free Free plan + paid
Starting price Open source $29/mo
Free plan Not checked yet ✓ (best)
Free trial — —
Deployment Self-hosted Cloud, Self-hosted
Support Community, Docs Email, Live chat, Community, Docs
Integrations 183+ integrations 100+ integrations
Built for Solo, Small business, Mid-market, Enterprise Small business, Mid-market, Enterprise
Features Haystack 1/3 · Langfuse 1/3
LLM evaluation Not checked yet Not checked yet
LLM observability Not checked yet Not checked yet
Open source ✓ ✓
Specs
Deployment Not checked yet Both
LLM providers Not checked yet Not checked yet
SDK languages Not checked yet Not checked yet
Our review
Pros
  • 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.
  • Traces model calls, agent tools, and retrieval steps hierarchically
  • Combines prompt management, evaluations, datasets, and cost tracking
  • Offers cloud and self-hosted deployment with a free plan
Cons
  • 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.
  • Hobby limits usage to 50k units monthly and 30 days of data access
  • Core includes 90 days of data access; longer retention starts with Pro
  • Enterprise controls such as SSO and audit logs are paid add-ons or plans
Our verdict

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 →

Langfuse is an open-source platform for teams building and operating LLM applications. It is aimed at developers who need visibility across model calls, agents, tools, and retrieval workflows, alongside ways to manage prompts and evaluate…

Read the review →
  1. HaystackLlm Developer Tools 9.1Open source
  2. LangfuseLlm Developer Tools 8.7Free plan

Strengths and trade-offs

  • 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.

  • Langfuse — where it wins

    • Traces model calls, agent tools, and retrieval steps hierarchically
    • Combines prompt management, evaluations, datasets, and cost tracking
    • Offers cloud and self-hosted deployment with a free plan

    Where it doesn't

    • Hobby limits usage to 50k units monthly and 30 days of data access
    • Core includes 90 days of data access; longer retention starts with Pro
    • Enterprise controls such as SSO and audit logs are paid add-ons or plans

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