# Redis

> Redis Stack with vector search via RediSearch module, HNSW/Flat indexes on in-memory store. Features: Hybrid BM25+vector, real-time cache, multi-tenancy. Use cases: Caching LLM responses, high-throughput RAG. Comparisons: Faster than disk DBs for hot data; vs Memgraph: simpler key-value.

- **URL:** https://redis.io/
- **Category:** In Memory Hybrid Vector Stores
- **Tags:** In Memory Vector Search, Hybrid BM25, High Throughput, Redis Stack
- **Updated:** 2026-04-28 11:38
- **Canonical page:** https://vectordb.ever.works/items/redis

## Details

## Overview

Redis is an in-memory data store that provides vector search capabilities through its RediSearch module. It delivers sub-millisecond latency and supports hybrid search combining BM25 text search with vector similarity, alongside a fully managed Redis Cloud vector database offering.

## Key Features

- **Vector Search**: Native vector indexing and similarity search via RediSearch module using HNSW
- **Sub-Millisecond Latency**: Ultra-fast query response powered by in-memory architecture
- **Hybrid Search**: Combines BM25 text search with vector similarity and filtering in a single query
- **Multiple Data Types**: Supports key-value, documents, streams, geospatial, and more alongside vectors
- **Scalability**: Cluster support with replication and automatic failover
- **Real-Time Data**: Immediate visibility of updates and inserts

## Deployment Options

### Redis Community Edition
- Open source and free
- Self-hosted

### Redis Cloud
- Fully managed service on AWS, Google Cloud, and Azure
- Redis Vector Database offering
- Usage-based pricing with scalable tiers
- Enterprise-grade SLAs and support

### Redis Enterprise
- On-premises or hybrid deployment
- Advanced features for production workloads

## Use Cases

- Semantic caching
- Retrieval-augmented generation (RAG)
- Real-time recommendation systems
- Feature stores for ML
- Session and context management for AI agents

## Pricing

### Community Edition
Free and open source.

### Redis Cloud
Usage-based pricing varies by tier and configuration. Pricing details at redis.io/pricing.

### Redis Enterprise
Available upon request for on-premises deployments.

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