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Faiss

A library for efficient similarity search and clustering of dense vectors.

View on GitHub Official site
Vector Databases MIT Easy setup 40,565 stars

Overview

Description

Faiss lets you search through billions of vectors in milliseconds to find the most similar ones. It's the industry standard for similarity search and clustering, powering AI applications from recommendation engines to document retrieval. Runs on CPU or GPU and scales from a laptop to a data center.

Technical scorecard

License

MIT

Commercial use

Yes

OpenAI-compatible API

No

REST API

No

Fine-tuning support

No

Quantization support

No

Docker available

Yes

GUI / no-code available

No

Telemetry

Unknown

Offline after setup

Yes

Data & Privacy

Does it send data online?

After setup, this listing is marked as usable offline. Confirm network behavior against the upstream project before regulated deployment.

Does it store history?

Not verified in this directory yet. Review the upstream docs for persistence, logs, and workspace storage.

License checks?

Commercial use is marked as allowed or likely allowed by the listed license.

Telemetry?

Unknown

Last verified: Jul 22, 2026. Maintainer verification should be treated as directory guidance, not legal advice.

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Setup & Installation

Easy

A developer can usually get this running with standard docs.

# Start with the official project repository
# https://github.com/facebookresearch/faiss

Hardware Requirements

Hardware tagsCPU, GPU (NVIDIA), GPU (AMD)
LanguagesC++, Python

Works Well With