Amazon S3 Vectors vs OpenSearch
Amazon S3 Vectors: Vector storage and similarity queries built into S3, trading latency for very low cost at scale. OpenSearch: Apache-licensed, foundation-governed fork of Elasticsearch for search, vectors and observability.
key differences
- Amazon S3 Vectors is primarily a vector database; OpenSearch is search engine.
- Licensing: Amazon S3 Vectors is proprietary (Proprietary (AWS service)); OpenSearch is open source (permissive) (Apache License 2.0).
- Transactions: Amazon S3 Vectors offers none ACID; OpenSearch offers limited.
- Only OpenSearch has full-text search, geospatial, json, compression, online schema changes.
- Amazon S3 Vectors has a serverless option; OpenSearch does not.
choose amazon-s3-vectors for
- +Cheap long-term store for RAG embeddings
- +Agent memory at very large scale
- +Archive tier behind a faster vector engine
- +Bedrock Knowledge Bases backend
best at · Vector search, RAG
choose opensearch for
- +Log analytics and observability
- +Application and e-commerce search
- +Vector and hybrid search for RAG on AWS
- +Security event analytics
best at · Search, Vector search, RAG
Amazon S3 Vectors vs OpenSearch: FAQ
What is the difference between Amazon S3 Vectors and OpenSearch?
Amazon S3 Vectors: Vector storage and similarity queries built into S3, trading latency for very low cost at scale. OpenSearch: Apache-licensed, foundation-governed fork of Elasticsearch for search, vectors and observability. Amazon S3 Vectors is primarily a vector database; OpenSearch is search engine. Licensing: Amazon S3 Vectors is proprietary (Proprietary (AWS service)); OpenSearch is open source (permissive) (Apache License 2.0). Transactions: Amazon S3 Vectors offers none ACID; OpenSearch offers limited.
When should I choose Amazon S3 Vectors over OpenSearch?
Choose Amazon S3 Vectors for cheap long-term store for RAG embeddings, agent memory at very large scale and archive tier behind a faster vector engine. Choose OpenSearch for log analytics and observability; application and e-commerce search; and vector and hybrid search for RAG on AWS.
Is Amazon S3 Vectors or OpenSearch more popular?
OpenSearch ranks #18 on the WhichDB Score (56.6/100) and Amazon S3 Vectors ranks #491 (2.1/100). Popularity is not fit: check the requirements that matter for your project.
Are Amazon S3 Vectors and OpenSearch open source?
No. Amazon S3 Vectors is proprietary, closed-source software. Yes. OpenSearch is open source. License: Apache License 2.0.