Quick comparison
| # | App | Pricing | Verified price | Open source | Platforms | Verified facts | Score |
|---|
| 1 |  Qdrant | Open source | — | Yes | Self-hosted, Web | 5 of 5 | 64.8 |
| 2 |  Chroma | Open source | — | Yes | Self-hosted, Linux, macOS +1 | 5 of 5 | 55.9 |
| 3 |  Milvus | Open source | — | Yes | Self-hosted, Linux | 3 of 3 | 55.3 |
| 4 |  Elasticsearch | Open source | — | Yes | Self-hosted, Web | 4 of 4 | 52.6 |
| 5 |  PostgreSQL | Open source | — | Yes | Linux, macOS, Windows +1 | 5 of 5 | 51.2 |
1Best for: Teams wanting a permissively licensed vector engine they can run anywhere
Open sourceSelf-hostableSelf-hosted, Web
Why switch from Weaviate
Rust-based open-source engine with strong filtering and a free-forever cloud cluster.
Pros
- Apache 2.0 licence and easy Docker self-hosting
- Strong metadata filtering alongside vector search
- Free-forever cloud cluster for testing
Cons
- Free cloud cluster is tiny at 1 GB of RAM
- Cluster sizing is up to you, unlike serverless Pinecone
- Fewer built-in AI conveniences than some managed rivals
How this score is calculated
Editorial fit ×0.387
Reviews ×0.363
Clicks (90 days) ×0.150
Freshness ×0.15100
Votes ×0.150
0 counted reviews, 0 up and 0 down votes. Full formula
2Best for: Developers who want a simple, free, self-hosted vector store for RAG and semantic search prototypes.
Open sourceSelf-hostableSelf-hosted, Linux, macOS, Windows
Why switch from Weaviate
Simple open-source embedding store that runs in-process in Python, ideal for prototypes and small RAG apps.
Pros
- Apache 2.0 licence with no usage limits on the open-source version
- Quick to start with pip or npm and an embedded local mode
- Combines vector, BM25, full-text, regex and metadata search
Cons
- Hosted Chroma Cloud is being wound down after the Replit deal
- You run, scale and back up the database yourself
- Future roadmap now depends on Replit's priorities
How this score is calculated
Editorial fit ×0.357
Reviews ×0.363
Clicks (90 days) ×0.150
Freshness ×0.15100
Votes ×0.150
0 counted reviews, 0 up and 0 down votes. Full formula
3Best for: Teams self-hosting vector search that need to scale to very large collections
Open sourceSelf-hostableSelf-hosted, Linux
Why switch from Weaviate
Open-source vector database built for billions of vectors, with GPU indexes and a managed cloud from Zilliz.
Pros
- Apache 2.0 licence with no paid core
- Same API from a local Python library up to a distributed cluster
- Many index types, including disk-based and GPU indexes
- Managed option available through Zilliz Cloud
Cons
- Distributed mode needs Kubernetes and has many moving parts
- Heavier to operate than single-binary options like Qdrant or Chroma
- Managed hosting is a separate product from a separate site
How this score is calculated
Editorial fit ×0.363
Reviews ×0.363
Clicks (90 days) ×0.150
Freshness ×0.1585
Votes ×0.150
0 counted reviews, 0 up and 0 down votes. Full formula
4Best for: Engineering teams with large or complex search, logging or analytics needs
Open sourceSelf-hostableSelf-hosted, Web
Why switch from Weaviate
Adds vector search to a mature full-text and analytics engine you may already run.
Pros
- Scales to very large datasets across many nodes
- Full-text, vector and hybrid search in one engine
- Self-managed, hosted and serverless options
Cons
- Needs real tuning and operations work to run well
- Memory-hungry compared with lighter search engines
- Several features need a paid Elastic subscription
How this score is calculated
Editorial fit ×0.346
Reviews ×0.363
Clicks (90 days) ×0.150
Freshness ×0.15100
Votes ×0.150
0 counted reviews, 0 up and 0 down votes. Full formula
5Best for: Developers and teams who want a free, standards-minded relational database that scales with their app.
Open sourceSelf-hostableLinux, macOS, Windows, Self-hosted
Why switch from Weaviate
pgvector keeps embeddings inside your existing Postgres database.
Pros
- Strong SQL standards support and full ACID transactions
- Rich types: JSONB, arrays, ranges, plus PostGIS for maps
- Highly extensible with custom types and functions
- Permissive licence and community governance, not one vendor
Cons
- Running replication, failover and major upgrades yourself takes expertise
- Connection handling often needs a pooler under heavy load
- No official GUI; you pick a separate client
How this score is calculated
Editorial fit ×0.341
Reviews ×0.363
Clicks (90 days) ×0.150
Freshness ×0.15100
Votes ×0.150
0 counted reviews, 0 up and 0 down votes. Full formula
Verified facts
5 of 5 verified- License
- PostgreSQL License (BSD/MIT-like)
- Checked Nov 8, 2026postgresql.org(opens source in a new tab)
- Origins
- 1986, UC Berkeley POSTGRES project
- Checked Nov 8, 2026postgresql.org(opens source in a new tab)
- ACID-compliant
- Since 2001
- Checked Nov 8, 2026postgresql.org(opens source in a new tab)
- JSON support
- JSON/JSONB
- Checked Nov 8, 2026postgresql.org(opens source in a new tab)
- Platforms
- Linux, macOS, Windows, BSD, Solaris
- Checked Nov 8, 2026postgresql.org(opens source in a new tab)