Best Open-Source Vector Database 2026: Qdrant vs Milvus vs Weaviate vs Pgvector

Qdrant vs Milvus vs Weaviate vs pgvector in 2026 — index types, hybrid search, filtering, scaling, licenses, memory costs per 1M and 100M vectors, and a clear… From the article "Best Open-Source Vector Database 2026: Qdrant vs Milvus vs Weaviate vs Pgvector" by Synor, published on Misar.Blog. In this episode: 0:00 For Most Teams in 2026 0:31 When Vector Count Climbs Beyond ~10 1:15 Milvus Wins for True Billion-Scale Workloads Thanks to GPU Acceleration 1:51 Weaviate Is Strongest When You Want Built-In Hybrid Search (BM25 + Vectors) 2:23 Pgvector Is Not a Database but a Postgres Extension That Keeps Embeddings 3:03 Qdrant Leads on QPS per CPU Core 4:01 Milvus Is the Only Open-Source Engine That Can Change the Game with GPUs 4:33 Weaviate’s Hybrid Queries (BM25 + Vector) Often Beat a Two-System Setup 5:04 The Differentiation Among the Four Major Open-Source Vector Databases Lies This episode is narrated by an AI voice from a written article. More episodes: Tokenized Money Market Funds vs Stablecoins: On-Chain Cash Best PSU for a Used RTX 4090 (2026 Picks) Best Embedding Models 2026: OpenAI vs Voyage vs Open-Source Related reads: vLLM PagedAttention Explained Simply (with Visuals) Llama 4 vs Qwen 3.6 70B on RTX 4090: Speed Benchmarks 🔔 Subscribe to every episode Read the article: https://www.misar.blog/@synor/articles/best-open-source-vector-database. Read the articles by this Author: https://www.misar.blog/@synor. Generated using: https://www.misar.ai (Misar.AI).