---
title: "chroma vs pgvector"
type: "comparison"
canonical_url: "https://www.graphcanon.com/compare/chroma-core-chroma-vs-pgvector-pgvector"
tools: ["chroma-core-chroma", "pgvector-pgvector"]
---

# chroma vs pgvector

Neutral, constraint-first comparison with live GitHub stats.

| | [chroma](/tools/chroma-core-chroma.md) | [pgvector](/tools/pgvector-pgvector.md) |
| --- | --- | --- |
| Tagline | Search infrastructure for AI | Open-source vector similarity search for Postgres |
| Stars | 28,728 | 22,112 |
| Forks | 2,370 | 1,233 |
| Open issues | 732 | 14 |
| Language | Rust | C |
| Adopt for | Chroma is an open-source data infrastructure specifically for AI tasks such as vector, hybrid, and full-text search built with Rust. It provides a minimalist API of only four functions to cover essential operations like: | <ul><li><strong>Open-source vector similarity search:</strong> pgvector extends PostgreSQL for exact and approximate nearest neighbor search on various types of vectors.</li><li><strong>C-based library:</strong> Written, |
| Persona | - | - |
| Runtime | - | - |
| License | Apache-2.0 | Other |
| Categories | Vector Databases | Vector Databases |

## Trust and health

_Sourced signals - not a safety guarantee. No winner column._

| | [chroma](/tools/chroma-core-chroma.md) | [pgvector](/tools/pgvector-pgvector.md) |
| --- | --- | --- |
| Open issues (now) | 732 | 14 |
| Security scan | 8 low (8 low) | No lockfile |
| Full report | [trust report](/tools/chroma-core-chroma/trust.md) | [trust report](/tools/pgvector-pgvector/trust.md) |

**Typed relationship:** chroma _(related)_ pgvector

## Shared compatibility

- **Python**: [chroma](/tools/chroma-core-chroma.md) - Python runtime; [pgvector](/tools/pgvector-pgvector.md) - Python runtime

## Decision facts: chroma

- **Adopt for:** Chroma is an open-source data infrastructure specifically for AI tasks such as vector, hybrid, and full-text search built with Rust. It provides a minimalist API of only four functions to cover essential operations like:

## Decision facts: pgvector

- **Adopt for:** <ul><li><strong>Open-source vector similarity search:</strong> pgvector extends PostgreSQL for exact and approximate nearest neighbor search on various types of vectors.</li><li><strong>C-based library:</strong> Written,

## Choose when

### Choose chroma if…

- chroma is primarily Rust; pgvector is C.
- License: chroma is Apache-2.0, pgvector is Other.
- Graph edge: chroma is a typed related of pgvector - see the relationship row above.
- Tags unique to chroma: agents, rust, rust-lang, database.
- You need fast, efficient vector search capabilities integrated deeply into your AI workflows.

### Choose pgvector if…

- pgvector is primarily C; chroma is Rust.
- License: pgvector is Other, chroma is Apache-2.0.
- Graph edge: pgvector is a typed related of chroma - see the relationship row above.
- Tags unique to pgvector: approximate-nearest-neighbor-search, nearest-neighbor-search.
- You prefer an open-source solution for integrating vector similarity search with existing Postgres databases, offering ACID compliance and robust data management features.

## When NOT to use chroma

- You require multi-language client support beyond Python and JavaScript.
- Your use case demands a more extensive feature set and customization options than the core API provides, as Chroma's design philosophy is to keep things lean and straightforward.

## When NOT to use pgvector

- You are working on Windows environments without access to C++ support tools required for native compilation; alternative installation methods like Docker might introduce additional setup complexity.
- Your project requires real-time search operations with extremely low latency that may not be fully satisfied by the PostgreSQL infrastructure underlying pgvector.

## Common questions

### What is the difference between chroma and pgvector?

chroma: Search infrastructure for AI. pgvector: Open-source vector similarity search for Postgres. See the comparison table for live GitHub stats and shared categories.

### When should I choose chroma over pgvector?

Choose chroma over pgvector when chroma is primarily Rust; pgvector is C; License: chroma is Apache-2.0, pgvector is Other; Graph edge: chroma is a typed related of pgvector - see the relationship row above; Tags unique to chroma: agents, rust, rust-lang, database; You need fast, efficient vector search capabilities integrated deeply into your AI workflows.

### When should I choose pgvector over chroma?

Choose pgvector over chroma when pgvector is primarily C; chroma is Rust; License: pgvector is Other, chroma is Apache-2.0; Graph edge: pgvector is a typed related of chroma - see the relationship row above; Tags unique to pgvector: approximate-nearest-neighbor-search, nearest-neighbor-search; You prefer an open-source solution for integrating vector similarity search with existing Postgres databases, offering ACID compliance and robust data management features.

### When should I avoid chroma?

You require multi-language client support beyond Python and JavaScript. Your use case demands a more extensive feature set and customization options than the core API provides, as Chroma's design philosophy is to keep things lean and straightforward.

### When should I avoid pgvector?

You are working on Windows environments without access to C++ support tools required for native compilation; alternative installation methods like Docker might introduce additional setup complexity. Your project requires real-time search operations with extremely low latency that may not be fully satisfied by the PostgreSQL infrastructure underlying pgvector.

### Is chroma or pgvector more popular on GitHub?

chroma has more GitHub stars (28,728 vs 22,112). Stars measure visibility, not whether either tool fits your constraints.

### Are chroma and pgvector open source?

Yes - both are open-source projects on GitHub (chroma: Apache-2.0, pgvector: Other).

### Where can I find alternatives to chroma or pgvector?

GraphCanon lists graph-backed alternatives at /tools/chroma-core-chroma/alternatives and /tools/pgvector-pgvector/alternatives (/tools/chroma-core-chroma/alternatives.md, /tools/pgvector-pgvector/alternatives.md), ranked by typed relationship edges rather than popularity votes.

### Is there a machine-readable version of this comparison?

Yes. The markdown twin at /compare/chroma-core-chroma-vs-pgvector-pgvector.md mirrors this page for agents and LLM crawlers, with the same stats table and FAQ answers.

### Which is better maintained, chroma or pgvector?

chroma: Very active. pgvector: Very active. Compare maintenance labels, days since push, and release cadence in the trust section below - stars alone do not measure maintenance.

### Where are the full trust reports for chroma and pgvector?

GraphCanon publishes per-repo trust reports with dated maintenance, provenance, and scan summaries: chroma: /tools/chroma-core-chroma/trust; pgvector: /tools/pgvector-pgvector/trust.

---

**Machine-readable endpoints**

- JSON: [`/api/graphcanon/graph?tool=chroma-core-chroma`](/api/graphcanon/graph?tool=chroma-core-chroma)
- LLM index: [/llms.txt](/llms.txt)
- Full corpus: [/llms-full.txt](/llms-full.txt)

_GraphCanon - The knowledge graph for AI development. https://www.graphcanon.com/_