Open source focus

Open Source Alternatives to Haystack

17 open source AI Search Engine options similar to Haystack, ranked by named competitors first, sector overlap, and our 0-100 AI-readiness score. Every company listed publishes its source: each one carries an open source sector tag and a public GitHub repository.

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LlamaIndex Inc.39
Foundation ModelSan Francisco, United States
Company
Open source · Self-hostable
GitHits45
Developer ToolsHelsinki, Finland$1.5M
The Google of code search for open-source.
Open source · Self-hostable
Langchain-Chatchat10
Open Source
Open-source, offline-deployable RAG and Agent application built on LangChain for local knowledge base Q&A.
Open source · Self-hostable
Mem056
Agentic AISan Francisco, United States$24.0M
Persistent memory layer for AI agents and applications.
Open source · Self-hostable
Feast AI54
MLOpsSan Francisco, United States
An open-source feature store for managing and serving data for AI/ML models in production.
Open source · Self-hostable
LiteLLM53
Foundation ModelSan Francisco, United States
An open-source Python library providing a unified interface for interacting with various LLM providers.
Open source · Self-hostable
RelAI51
Agentic AISan Francisco, United States$10.0M
An open-source platform for building, simulating, evaluating, and optimizing reliable AI agents.
Open source · Self-hostable
Littlebat9
Open Source
Open-source AI tools for iOS and AWS, allowing self-hosting and data privacy.
Open source
Firmgate7
Enterprise Software
Australian-owned, sovereign-built, open-source self-hosted intranet with AI-enabled enterprise modules.
Open source
Llmkb7
Knowledge Management
Self-hosted knowledge-graph wiki platform for teams.
Open source
Spice AI40
Databaseתל אביב - יפו, Israel
Ground AI in enterprise data with zero ETL. Spice is an open-source SQL query & hybrid search engine built for data-intensive apps & AI agents.
Open source · Self-hostable
Langflow32
Agentic AILisbon, Portugal
Low-code platform for building, iterating, and deploying AI applications, especially RAG and multi-agent systems.
Open source · Self-hostable
Inconvo25
Agentic AIUnknown, Unknown
Inconvo is an open-source platform for building data agents on production data with safe queries, permissions, and structured outputs.
Open source · Self-hostable
Qdrant71
Vector DatabaseBerlin, Germany$96.5M
High-performance, open-source vector search engine built in Rust for production-grade AI and machine learning workloads.
Open source · Self-hostable
Airweave61
Agentic AISan Francisco, United States$6.0M
Open-source tool to transform application data into accessible knowledge for AI agents.
Open source · Self-hostable
Keep45
EnterpriseSan Francisco, United States$2.5M
Open-source alert management platform using AI to reduce noise and improve alert actionability for engineers.
Open source · Self-hostable
PromptQL45
Artificial IntelligenceSan Francisco, United States
An AI-native workspace designed to turn team interactions into actionable, proprietary data for agentic workflows.
Open source · Self-hostable

Company	Sector	License	HQ	Funding	Score
LlamaIndex Inc.Company	Foundation Model	Open source · Self-hostable	San Francisco, United States	—	39
GitHitsThe Google of code search for open-source.	Developer Tools	Open source · Self-hostable	Helsinki, Finland	$1.5M	45
Langchain-ChatchatOpen-source, offline-deployable RAG and Agent application built on LangChain for local knowledge base Q&A.	Open Source	Open source · Self-hostable	—	—	10
Mem0Persistent memory layer for AI agents and applications.	Agentic AI	Open source · Self-hostable	San Francisco, United States	$24.0M	56
Feast AIAn open-source feature store for managing and serving data for AI/ML models in production.	MLOps	Open source · Self-hostable	San Francisco, United States	—	54
LiteLLMAn open-source Python library providing a unified interface for interacting with various LLM providers.	Foundation Model	Open source · Self-hostable	San Francisco, United States	—	53
RelAIAn open-source platform for building, simulating, evaluating, and optimizing reliable AI agents.	Agentic AI	Open source · Self-hostable	San Francisco, United States	$10.0M	51
LittlebatOpen-source AI tools for iOS and AWS, allowing self-hosting and data privacy.	Open Source	Open source	—	—	9
FirmgateAustralian-owned, sovereign-built, open-source self-hosted intranet with AI-enabled enterprise modules.	Enterprise Software	Open source	—	—	7
LlmkbSelf-hosted knowledge-graph wiki platform for teams.	Knowledge Management	Open source	—	—	7
Spice AIGround AI in enterprise data with zero ETL. Spice is an open-source SQL query & hybrid search engine built for data-intensive apps & AI agents.	Database	Open source · Self-hostable	תל אביב - יפו, Israel	—	40
LangflowLow-code platform for building, iterating, and deploying AI applications, especially RAG and multi-agent systems.	Agentic AI	Open source · Self-hostable	Lisbon, Portugal	—	32
InconvoInconvo is an open-source platform for building data agents on production data with safe queries, permissions, and structured outputs.	Agentic AI	Open source · Self-hostable	Unknown, Unknown	—	25
QdrantHigh-performance, open-source vector search engine built in Rust for production-grade AI and machine learning workloads.	Vector Database	Open source · Self-hostable	Berlin, Germany	$96.5M	71
AirweaveOpen-source tool to transform application data into accessible knowledge for AI agents.	Agentic AI	Open source · Self-hostable	San Francisco, United States	$6.0M	61
KeepOpen-source alert management platform using AI to reduce noise and improve alert actionability for engineers.	Enterprise	Open source · Self-hostable	San Francisco, United States	$2.5M	45
PromptQLAn AI-native workspace designed to turn team interactions into actionable, proprietary data for agentic workflows.	Artificial Intelligence	Open source · Self-hostable	San Francisco, United States	—	45