Side-by-Side Comparison · 2026

Flowise vs Haystack: Full Comparison (2026)

Flowise is open-source no-code llm flow builder for building ai apps visually. Haystack is open-source framework for production nlp and rag pipelines. Use the breakdown below to find the right fit for your needs.

Flowise

FlowiseAI

Freemium
vs

Haystack

deepset

Free
This page presents factual information sourced from publicly available vendor documentation and product pages. AIHub does not endorse either product. The right tool depends on your specific use case, team, and requirements — we recommend evaluating both tools directly before making a decision.

Side-by-Side Overview

Pricing Model
Flowise: FreemiumHaystack: Free
API Access
Flowise: AvailableHaystack: Not available
Platforms
Flowise: Web (cloud), Docker (self-hosted), npm, Railway, RenderHaystack: Web
Integrations
Flowise: 10 integrationsHaystack: —
Vendor
Flowise: FlowiseAIHaystack: deepset
Category
Flowise: FrameworksHaystack: Frameworks
Launch
Flowise: 2023Haystack: —

About Flowise

Flowise is an open-source, low-code tool for building LLM applications and AI agent workflows using a visual drag-and-drop interface. Built on LangChain under the hood, it lets developers and non-developers assemble RAG pipelines, chatbots, and agent chains without writing code. Self-hostable with Docker, it has become one of the most popular tools for visually prototyping and deploying LLM apps.

Designed For

  • RAG chatbot building
  • Visual LLM workflow prototyping
  • Agent pipeline creation
  • Document Q&A apps
Full Flowise details

About Haystack

Haystack by deepset is an open-source framework for building NLP applications, RAG systems, and LLM pipelines. Features a pipeline architecture with 60+ integrations including all major vector databases and LLM providers.

Designed For

  • Document Q&A
  • RAG pipelines
  • Semantic search
  • LLM application development
Full Haystack details

Strengths & Limitations

Flowise

Strengths

  • Drag-and-drop visual builder
  • LangChain components included
  • Self-hostable for free
  • Built-in vector store integrations
  • Embed chatbots on websites
  • Active community

Limitations

  • Less flexible than pure code
  • Can hit complexity limits for large flows
  • Cloud version needed for non-technical sharing
  • Performance overhead vs raw LangChain

Haystack

Strengths

  • Production-ready
  • 60+ integrations
  • Pipeline architecture

Limitations

  • Steeper learning curve
  • Less popular than LangChain

Frequently Asked Questions

What is the difference between Flowise and Haystack?

Flowise is open-source no-code llm flow builder for building ai apps visually, while Haystack is open-source framework for production nlp and rag pipelines. Flowise is designed for Non-developers building AI apps, Agencies prototyping AI solutions; Haystack is designed for Frameworks. The right fit depends on your specific requirements.

How do the pricing models compare?

Flowise is available under a Freemium model. Haystack is available under a Free model. Flowise's entry tier starts at $0. Always verify pricing on each vendor's official website as it may change.

What integrations does each tool support?

Flowise integrates with OpenAI, Anthropic, Ollama, Pinecone. Haystack integrates with various tools. Check each vendor's documentation for the full and current list.

How do I choose between Flowise and Haystack?

Consider your team's technical requirements, budget, existing tooling, and use case before deciding. We recommend signing up for free trials or demos of both tools where available, and consulting each vendor's documentation. AIHub provides this comparison for informational purposes only.