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Comparison

chroma vs pgvector

chroma (Search infrastructure for AI) vs pgvector (Open-source vector similarity search for Postgres) - live GitHub stats and typed graph relationships, not marketing.

Markdown twin · chroma alternatives · pgvector alternatives

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chroma

chroma-core/chroma

★ 29kpushed Jul 8, 2026

pgvector

pgvector/pgvector

★ 22kpushed Jul 7, 2026

Tagline

chroma: Search infrastructure for AI
pgvector: Open-source vector similarity search for Postgres

Stars

chroma: 29k
pgvector: 22k

Forks

chroma: 2.4k
pgvector: 1.2k

Open issues

chroma: 732
pgvector: 14

Language

chroma: Rust
pgvector: C

Adopt for

chroma: 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:
pgvector: <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

chroma: -
pgvector: -

Runtime

chroma: -
pgvector: -

License

chroma: Apache-2.0
pgvector: Other

Last pushed

chroma: Jul 8, 2026
pgvector: Jul 7, 2026

	chroma	pgvector
Tagline	Search infrastructure for AI	Open-source vector similarity search for Postgres
Stars	29k	22k
Forks	2.4k	1.2k
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
Last pushed	Jul 8, 2026	Jul 7, 2026
Categories	Vector Databases	Vector Databases
Trust and health
Open issues (now)	732	14
Security scan	8 low (8 low)	No lockfile
Full report	Trust report	Trust report
Typed relationship	chroma related pgvector
Shared compatibility	Python · chroma: Python runtime · pgvector: Python runtime

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.

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.

GitHub Details

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 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.

GitHub Details

Explore

chroma trust report →pgvector trust report →Vector Databases category →All comparisons Stack workflows Trending tools

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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.