Open source Chroma alternatives: 5 apps ranked by verified data
Facts checked Nov 8, 2026AppBreakup editorialHow we rank 5 of the 6 Chroma alternatives we track are open source. Qdrant, Weaviate and Milvus rank highest, with facts last verified Nov 8, 2026.
Chroma has been acquired. Signed an agreement to join Replit on 23 October 2026, with Chroma Cloud being wound down, according to the Chroma blog.
Quick comparison
| # | App | Pricing | Verified price | Open source | Platforms | Verified facts | Score |
|---|
| 1 |  Qdrant | Open source | — | Yes | Self-hosted, Web | 5 of 5 | 68.8 |
| 2 |  Weaviate | Open source | From $45/month | Yes | Self-hosted, Web | 4 of 4 | 64.8 |
| 3 |  Milvus | Open source | — | Yes | Self-hosted, Linux | 3 of 3 | 53.6 |
| 4 |  PostgreSQL | Open source | — | Yes | Linux, macOS, Windows +1 | 5 of 5 | 51.2 |
| 5 |  Elasticsearch | Open source | — | Yes | Self-hosted, Web | 4 of 4 | 50.0 |
1Best for: Teams wanting a permissively licensed vector engine they can run anywhere
Open sourceSelf-hostableSelf-hosted, Web
Why switch from Chroma
Apache-licensed Rust engine you can self-host, with a managed cloud that is still running and strong filtering.
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 ×0.3100
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 building RAG or semantic search who want open source with a managed cloud option
Open sourceSelf-hostableSelf-hosted, Web
Why switch from Chroma
Open source with hybrid search built in and a managed cloud, a natural home for teams losing Chroma Cloud.
Pros
- Open source and self-hostable
- Hybrid search and built-in embedding integrations
- Free cloud tier for experiments
Cons
- Free cloud tier is capped at 100,000 objects and one collection
- Cloud pricing spans several usage dimensions
- Self-hosting at scale needs Kubernetes experience
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
3Best for: Teams self-hosting vector search that need to scale to very large collections
Open sourceSelf-hostableSelf-hosted, Linux
Why switch from Chroma
Open-source vector database built for billions of vectors across a cluster, for when Chroma outgrows one machine.
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 ×0.357
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: 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 Chroma
With pgvector, embeddings live next to your app data in the Postgres you may already run.
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)
5Best for: Engineering teams with large or complex search, logging or analytics needs
Open sourceSelf-hostableSelf-hosted, Web
Why switch from Chroma
Mature full-text and analytics engine that also does vector search, useful for larger hybrid workloads.
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 ×0.338
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