Faiss vs LanceDB
Faiss: Meta's C++/Python library for fast dense-vector similarity search and clustering, CPU and GPU. LanceDB: Embedded, serverless retrieval database on the Lance columnar format for multimodal AI data.
key differences
- Horizontal scaling is manual in Faiss and native in LanceDB.
- Transactions: Faiss offers none ACID; LanceDB offers limited.
- Only Faiss has in-memory.
- Only LanceDB has secondary indexes, full-text search, columnar storage, durable persistence, time travel.
- LanceDB has a serverless option; Faiss does not.
choose faiss for
- +Embedding similarity search inside ML pipelines
- +Offline deduplication and clustering
- +Building custom vector search services
- +ANN research and benchmarking
best at · Vector search, Embedded, Scientific
choose lancedb for
- +Embedded RAG in desktop, CLI and agent apps
- +Multimodal datasets shared by training and retrieval
- +Agent memory stores
- +Serverless vector search over S3
best at · Vector search, RAG, Embedded
Faiss vs LanceDB: FAQ
What is the difference between Faiss and LanceDB?
Faiss: Meta's C++/Python library for fast dense-vector similarity search and clustering, CPU and GPU. LanceDB: Embedded, serverless retrieval database on the Lance columnar format for multimodal AI data. Horizontal scaling is manual in Faiss and native in LanceDB. Transactions: Faiss offers none ACID; LanceDB offers limited. Only Faiss has in-memory.
When should I choose Faiss over LanceDB?
Choose Faiss for embedding similarity search inside ML pipelines; offline deduplication and clustering; and building custom vector search services. Choose LanceDB for embedded RAG in desktop, CLI and agent apps; multimodal datasets shared by training and retrieval; and agent memory stores.
Is Faiss or LanceDB more popular?
Faiss ranks #40 on the WhichDB Score (44.7/100) and LanceDB ranks #102 (27.5/100). Popularity is not fit: check the requirements that matter for your project.
Are Faiss and LanceDB open source?
Yes. Faiss is open source. License: MIT License. Yes. LanceDB is open source. License: Apache License 2.0.