Carbon (Perplexity) vs Haystack (2026)
Overview
Carbon, acquired by Perplexity in December 2024, provided pre-built data connectors for ingesting unstructured data from 25+ sources into LLM applications. Its managed API was wound down in March 2025, with its technology now integrated into Perplexity's enterprise data connectivity stack. Carbon's connectors supported Google Drive, Notion, Slack, Confluence, and other popular data sources for RAG pipelines.
Haystack by deepset is an open-source framework for building production-ready RAG pipelines, semantic search, and question answering systems. It provides modular components for document processing, retrieval, and generation with support for multiple LLM providers and vector stores.
Key features
Core capabilities each platform advertises.
- Data connectors
- Google Drive
- Notion
- Slack integration
- Modular RAG framework
- Pipeline-based architecture
- Strong evaluation tools
- 50+ integrations
- Production-ready components
Strengths and tradeoffs
What each tool does well, and the limitations to keep in mind.
Pros
- Pre-built connectors for easy integration with multiple data sources
- AI-optimized data processing with automatic chunking, embedding, and cleaning
- Enterprise-grade security with SOC 2 Type II compliance and end-to-end encryption
- Streamlined RAG development with production-ready infrastructure
- Now backed by Perplexity AI with enhanced enterprise capabilities
Cons
- Company was acquired and original standalone service is winding down
- Pricing information not transparently available
- Limited documentation on migration paths after acquisition
- Uncertain future roadmap as integration with Perplexity progresses
Pros
- Fully open-source and free to use with strong community support
- Vendor-agnostic architecture with broad integration support across LLM providers and vector databases
- Production-ready with Kubernetes-ready deployment and built-in observability
- Transparent and modular design with full visibility into AI decision-making
- Advanced features including hybrid retrieval, multimodal AI, and flexible prompt engineering
Cons
- Steeper learning curve compared to more opinionated frameworks
- Enterprise platform (deepset Studio) requires commercial license
- May require more configuration effort for basic use cases
Carbon (Perplexity) or Haystack — which should you choose?
Choose Carbon (Perplexity) if you wantChoose if you want
Choose Haystack if you wantChoose if you want
- Customizable RAG pipelines
- Document search and QA systems
- Enterprise knowledge management
- Modular AI application development
- Evaluation-driven development
Compare Carbon (Perplexity) and Haystack on your own traffic
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