product
Data quality: Editorially ReviewedFree
Retrieval & data layer
Vector Databases
Software & technology
Workflow orchestration
Self-hosted / on-premises
Retrieval & semantic search
Annoy
Vector Databases
Overview
Annoy (Approximate Nearest Neighbors Oh Yeah) is an open-source C++ library by Spotify for searching points in space that are close to a given query point. It uses a forest of random projection trees for efficient ANN search, supports memory-mapped files for fast lookups, and is optimized for read-heavy workloads. Annoy is widely used in recommendation systems.
- Pricing model
- Free
- Deployment
- Self-hosted / on-premises
- Regions served
- Global
- Categories
- Free, Retrieval & data layer, Vector Databases, Software & technology, Workflow orchestration, Self-hosted / on-premises, Retrieval & semantic search
- Last updated
- 2 October 2026
- Published
- 2 October 2026
Use cases
Workflow orchestration
Deployment options
Self-hosted / on-premises
Data sources & provenance
Where this information came from, how it was checked and when it was last looked at. “Last updated” records a change to the record — it does not mean the record was verified.
- Data quality
- Data quality: Editorially Reviewed
- Primary source
- github.com
- Sources cited
- 2
- Last reviewed
- 28 September 2026
- Last updated
- 2 October 2026
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