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Head-to-head · Llm Developer Tools

Haystack vs Opik

  • 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
Opik #8 in Llm Developer Tools 8.6/10 Free plan Free plan✓ 1 of 3 features Visit Opik

Haystack leads on 0 checks, Opik 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 Opik

Haystack scores higher on our rubric for llm developer tools: 9.1 against 8.6 out of 10; our editors rank them #3 and #8.

Haystack is the better fit for production RAG and retrieval pipeline teams. Opik is the better fit for teams seeking open-source LLM observability.

  • Haystack fits best

    Production RAG and retrieval pipeline teams

  • Opik fits best

    Teams seeking open-source LLM observability

Advertiser disclosure: iTechGuides is reader-supported. Vendors can pay for top positions in our rankings and for a place on other products' pages, and we may earn a commission when you click some links. Bought places stand at the number bought; this page and our disclosure say so. Paying vendors may get a fuller, more detailed review from our editors, and that review can change their score. How we rank.

Side by side

Feature Haystack 9.1/10 Visit ↗ Opik 8.6/10 Visit ↗
At a glance
Editor score 9.1 8.6
Ranking #3 in Llm Developer Tools #8 in Llm Developer Tools
Best for Production RAG and retrieval pipeline teams Teams seeking open-source LLM observability
Pricing model Free Free plan + paid
Starting price Open source $19/mo
Free plan Not checked yet ✓ (best)
Free trial — —
Deployment Self-hosted Cloud, Self-hosted
Support Community, Docs Email, Community, Docs
Integrations 183+ integrations 40+ integrations
Built for Solo, Small business, Mid-market, Enterprise Solo, Small business, Mid-market, Enterprise
Features Haystack 1/3 · Opik 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, tool, retrieval, and agent activity for debugging.
  • Combines evaluations, prompt versioning, monitoring, and cost tracking.
  • Offers free cloud and self-hosted open-source options.
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.
  • Pro Cloud's customizable span limits and retention require a paid plan.
  • Enterprise features such as SSO and dedicated support are in a custom-priced tier.
  • Its broad observability and evaluation scope may exceed simpler project needs.
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 →

Opik is an LLM observability and evaluation platform from Comet for developers building chatbots, RAG pipelines, and multi-step agents. It records model calls, tool invocations, retrieval steps, and agent actions, then supports debugging,…

Read the review →
  1. HaystackLlm Developer Tools 9.1Open source
  2. OpikLlm Developer Tools 8.6Free 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.

  • Opik — where it wins

    • Traces model, tool, retrieval, and agent activity for debugging.
    • Combines evaluations, prompt versioning, monitoring, and cost tracking.
    • Offers free cloud and self-hosted open-source options.

    Where it doesn't

    • Pro Cloud's customizable span limits and retention require a paid plan.
    • Enterprise features such as SSO and dedicated support are in a custom-priced tier.
    • Its broad observability and evaluation scope may exceed simpler project needs.
  • Haystack9.1/10 · Open source

    A composable Python framework for teams building customizable retrieval and LLM pipelines.

    Visit HaystackFull verdict →
  • Opik8.6/10 · Free plan

    Trace, evaluate, and monitor LLM apps in the cloud or on your own infrastructure.

    Visit OpikFull verdict →

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