annoy VS faiss

Compare annoy vs faiss and see what are their differences.


Approximate Nearest Neighbors in C++/Python optimized for memory usage and loading/saving to disk (by spotify)


A library for efficient similarity search and clustering of dense vectors. (by facebookresearch)
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annoy faiss
17 32
9,961 17,238
3.1% 2.5%
3.6 8.1
9 days ago 4 days ago
C++ C++
Apache License 2.0 MIT License
The number of mentions indicates the total number of mentions that we've tracked plus the number of user suggested alternatives.
Stars - the number of stars that a project has on GitHub. Growth - month over month growth in stars.
Activity is a relative number indicating how actively a project is being developed. Recent commits have higher weight than older ones.
For example, an activity of 9.0 indicates that a project is amongst the top 10% of the most actively developed projects that we are tracking.


Posts with mentions or reviews of annoy. We have used some of these posts to build our list of alternatives and similar projects. The last one was on 2022-03-02.


Posts with mentions or reviews of faiss. We have used some of these posts to build our list of alternatives and similar projects. The last one was on 2022-06-03.

What are some alternatives?

When comparing annoy and faiss you can also consider the following projects:

milvus - Vector database for scalable similarity search and AI applications.

hnswlib - Header-only C++/python library for fast approximate nearest neighbors

hdbscan - A high performance implementation of HDBSCAN clustering.

Weaviate - Weaviate is a cloud-native, modular, real-time vector search engine

ann-benchmarks - Benchmarks of approximate nearest neighbor libraries in Python

Top2Vec - Top2Vec learns jointly embedded topic, document and word vectors.

implicit - Fast Python Collaborative Filtering for Implicit Feedback Datasets

transformers - 🤗 Transformers: State-of-the-art Machine Learning for Pytorch, TensorFlow, and JAX.

KeyBERT - Minimal keyword extraction with BERT

pgvector - Open-source vector similarity search for Postgres

TensorRec - A TensorFlow recommendation algorithm and framework in Python.