Vector Stores & Memory

How AI systems remember. From vector databases for similarity search to higher-level memory layers and the embedding models that feed them, this is the retrieval backbone behind RAG and long-term context.

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Vector Databases

Stores for embeddings and similarity search

Chroma

Chroma

Chroma

Open-source embedding database for RAG — store vectors and query by similarity in a few lines.

v1.5.92026-05-05PythonApache-2.0
29.4k Open source Free tier Paid
LanceDB

LanceDB

LanceDB

Embedded vector database built on the Lance columnar format — serverless and local-first

v0.39.02026-09-17Rust / PythonApache-2.0
11.5k Open source Free tier Paid
Milvus

Milvus

Zilliz

Open-source vector database built for billion-scale similarity search

v3.0.22026-09-20GoApache-2.0
46.2k Open source Free tier Paid

pgvector

pgvector

Postgres extension for vector similarity search — add agent memory and RAG without a separate database.

v0.8.62026-07-29SQL / CPostgreSQL
23.1k Completely free Open source
Qdrant

Qdrant

Qdrant

High-performance open-source vector database for similarity search and agent memory

v1.19.12026-09-04RustApache-2.0
34.8k Open source Free tier Paid
Weaviate

Weaviate

Weaviate

Open-source vector database with hybrid search, filtering, and built-in vectorizers

v1.39.52026-09-15GoBSD-3-Clause
16.8k Open source Free tier Paid

Agent Memory

Long-term memory layers for agents

Mem0

Mem0

Memory layer for agents — extracts and recalls facts across sessions, not raw chat logs.

openclaw-v1.2.02026-09-18PythonApache-2.0
65.8k Open source Free tier Paid
Zep

Zep

Zep

Long-term memory layer for agents, building a temporal knowledge graph from conversations

zep-ingest-v0.3.02026-08-28PythonApache-2.0
4.9k Open source Free tier Paid

Embedding Models

Models that turn text into vectors

Run embedding models locally (e.g. bge-m3) to turn text into vectors for RAG and memory — no API.

v6.1.02026-09-18PythonApache-2.0
19.1k Completely free Open source