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zvec

Free

A lightweight, lightning-fast, in-process vector database

Search ToolsFreeFree tier
Type
Open Source
Company
Alibaba
Visit Website GitHub (9.5k stars)

About zvec

Zvec is an open-source, in-process vector database developed by Alibaba. It is designed to be lightweight, lightning-fast, and battle-tested, capable of scaling to billions of vectors with sub-millisecond search latency. Key capabilities include support for both dense and sparse embeddings, hybrid search that combines semantic similarity with structured filters, durable storage via write-ahead logging (WAL), concurrent read access by multiple processes, and single-process exclusive writes. As an in-process library, Zvec runs anywhere your code runs — notebooks, servers, CLI tools, or edge devices — with no servers, no configuration, and no fuss.

Key Features

Blazing fast: sub-millisecond search latency, scales to billions of vectors
Simple setup: single package, no servers, no configuration
Supports dense and sparse vectors with multi-vector queries
Hybrid search combining semantic similarity with structured filters
Durable storage using write-ahead logging (WAL)
Concurrent read access by multiple processes; single-process exclusive writes
Runs in notebooks, servers, CLI tools, or edge devices
Open-source and battle-tested by Alibaba

Pros & Cons

Pros
  • Extremely fast sub-millisecond search latency
  • Simple installation and usage with zero configuration
  • Native support for both dense and sparse embeddings
  • Hybrid search enables precise filtering combined with semantic similarity
  • Durable persistence via write-ahead logging prevents data loss
  • Concurrent read access allows multiple processes to query simultaneously
  • Versatile deployment across various environments
  • Open-source with backing from Alibaba
Cons
  • Writes are single-process exclusive, limiting write concurrency
  • In-process architecture restricts scaling to multi-node distributed setups

Best For

Similarity search in Jupyter notebooks and research environmentsProduction vector search for AI applications on serversEdge AI search on devices with limited resourcesCLI-based vector search tools and scripts

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FAQ

What is Zvec?
Zvec is an open-source, in-process vector database developed by Alibaba, designed for lightweight, lightning-fast similarity search.
Does Zvec support hybrid search?
Yes, Zvec supports hybrid search by combining semantic similarity with structured filters for precise results.
How does Zvec ensure data durability?
Zvec uses write-ahead logging (WAL) to guarantee persistence, even in the event of a process crash or power failure.
Can multiple processes access Zvec simultaneously?
Yes, multiple processes can read the same collection concurrently, but writes are exclusive to a single process.