Source: https://seerepo.com/compare/chroma-core/chroma/vs/opensearch-project/OpenSearch
Markdown source: https://seerepo.com/compare/chroma-core/chroma/vs/opensearch-project/OpenSearch.md
Description: chroma and OpenSearch share 7 technologies: s3, arrow, foyer, object_store, Tokio, parquet, and OpenTelemetry. chroma is written in Rust and OpenSearch in Java.

# chroma vs OpenSearch

chroma and OpenSearch share 7 technologies: s3, arrow, foyer, object_store, Tokio, parquet, and OpenTelemetry. chroma is written in Rust and OpenSearch in Java.

- [chroma-core/chroma](https://seerepo.com/r/chroma-core/chroma): Search infrastructure for AI
- [opensearch-project/OpenSearch](https://seerepo.com/r/opensearch-project/OpenSearch): 🔎 Open source distributed and RESTful search engine.

## What they share and what sets them apart

- In common: s3, arrow, foyer, object_store, Tokio, parquet, OpenTelemetry
- Only in chroma: axum, FastAPI, aws-sdk-s3, pgx, pq, sqlx-postgres, sqlx-sqlite, sqlx, Postgres, SQLite, usearch, tower, uvicorn, OpenAI, Rich, Ratatui, crossterm, indicatif, dialoguer, utoipa-swagger-ui, gorm.io/gorm, pypika, sea-query, bcrypt, github.com/aws/aws-sdk-go-v2/credentials, hf-hub, tokenizers, onnxruntime, rmcp, tree-sitter-md, validator, Pydantic, schemars, jsonschema, k8s-openapi, opentelemetry-api, opentelemetry-exporter-otlp-proto-grpc, opentelemetry-instrumentation-fastapi, tracing, github.com/pingcap/log, go.uber.org/zap, tracing-opentelemetry, github.com/rs/zerolog, google-cloud-googleapis, tracing-subscriber, boto3, go.opentelemetry.io/otel, go.opentelemetry.io/otel/metric, github.com/aws/aws-sdk-go-v2, github.com/aws/aws-sdk-go-v2/config, go.opentelemetry.io/contrib/instrumentation/github.com/aws/aws-sdk-go-v2/otelaws, go.opentelemetry.io/otel/exporters/otlp/otlpmetric/otlpmetricgrpc, go.opentelemetry.io/otel/exporters/otlp/otlptrace, go.opentelemetry.io/otel/exporters/otlp/otlptrace/otlptracegrpc, go.opentelemetry.io/otel/sdk, go.opentelemetry.io/otel/sdk/metric, go.opentelemetry.io/otel/trace, kube, kubernetes, opentelemetry-otlp, psutil, @xenova/transformers, cohere-ai, ollama, Ajv, Hugging Face, together-ai
- Only in OpenSearch: JAX-RS, apache-client, arrow-c-data, arrow-memory-netty-buffer-patch, avro, aws-crt-client, aws-json-protocol, kafka-clients, lucene-memory, org.apache.arrow:flight-core, datafusion, Apache, software.amazon.awssdk:sdk-core, org.apache.hadoop:hadoop-client-api, org.apache.calcite.avatica:avatica-core, datafusion-datasource, com.azure:azure-storage-blob, software.amazon.awssdk:kms, org.apache.hadoop:hadoop-hdfs, org.ehcache:ehcache, grpc-services, JetBrains, servlet-api, joou-java-6, com.google.auth:google-auth-library-oauth2-http, google-oauth-client, msal4j, nimbus-jose-jwt, oauth2-oidc-sdk, software.amazon.awssdk:auth, software.amazon.awssdk:sts, com.azure:azure-identity, compiler, jdom2, jsoup, mail, org.apache.james:apache-mime4j-dom, pdfbox-io, poi, poi-ooxml, poi-ooxml-lite, poi-scratchpad, tika-parsers, org.apache.tika:tika-core, org.apache.pdfbox:pdfbox, json-schema-validator, commons-logging, io.opentelemetry:opentelemetry-sdk-common, log4j-1.2-api, log4j-slf4j-impl, org.apache.logging.log4j:log4j-api, slf4j-api, log, org.apache.logging.log4j:log4j-core, software.amazon.awssdk:regions, io.opentelemetry:opentelemetry-sdk, software.amazon.awssdk:ec2, io.opentelemetry:opentelemetry-exporter-logging, io.opentelemetry:opentelemetry-exporter-otlp, io.opentelemetry.semconv:opentelemetry-semconv

## Side by side

| | chroma | OpenSearch |
|---|---|---|
| Size | 474,465 lines written, 886 code files | 3,021,895 lines written, 8,159 code files |
| Who writes it | 1.5% of its commits signed by AI. With Claude Code, Cursor, and Sweep | 0% of its commits signed by AI. With Claude Code, Cursor, GitHub Copilot, and CodeRabbit |
| Activity | Last push November 7, 2026, 4,542 commits, 29,650 stars | Last push November 9, 2026, 57,216 commits, 13,983 stars |
| Tests | 345 test files. 31% of its code files have a test that imports them | 5,508 test files. 65.6% of its code files have a test that imports them |

- Size: Lines written by people and agents, without generated ones; code files, without tests.
- Who writes it: A commit counts as AI's when it carries its signature: a Co-Authored-By line, its author name or the merge of its branch.
- Activity: From GitHub and its history, on the day SeeRepo read it.
- Tests: The files that test the code, and the share of code files a test imports.

## Frequently asked questions

### Which is bigger, chroma or OpenSearch?

OpenSearch, with 3,021,895 lines written; chroma has 474,465.

The proof: [opensearch-project/OpenSearch's code at commit 2923a00](https://github.com/opensearch-project/OpenSearch/tree/2923a00aa3758b357462dc85dc85ebe3e834e37d)

### Which has more GitHub stars, chroma or OpenSearch?

chroma, with 29,650 stars; OpenSearch has 13,983.

The proof: [chroma-core/chroma on GitHub](https://github.com/chroma-core/chroma)

### Which has more tests, chroma or OpenSearch?

OpenSearch, with 5,508 test files; chroma has 345.

The proof: [opensearch-project/OpenSearch's code at commit 2923a00](https://github.com/opensearch-project/OpenSearch/tree/2923a00aa3758b357462dc85dc85ebe3e834e37d)

### Which was updated more recently, chroma or OpenSearch?

OpenSearch: its last push was on November 9, 2026, and chroma's on November 7, 2026.

The proof: [opensearch-project/OpenSearch's commits on GitHub](https://github.com/opensearch-project/OpenSearch/commits)

### Which has more commits signed by AI, chroma or OpenSearch?

chroma: an AI signed 1.5% of its commits, with Claude Code, Cursor, and Sweep.

The proof: [the commits each tool signed in chroma-core/chroma](https://seerepo.com/r/chroma-core/chroma/ai)

## Sources

- chroma-core/chroma: Read on November 8, 2026, at commit 1a3ac2c (https://github.com/chroma-core/chroma/tree/1a3ac2c7c623adbd03ed2508dc27b98cdf26016d)
- opensearch-project/OpenSearch: Read on November 9, 2026, at commit 2923a00 (https://github.com/opensearch-project/OpenSearch/tree/2923a00aa3758b357462dc85dc85ebe3e834e37d)

## What is your repo built with?

Any public repo, with no account: https://seerepo.com/r/owner/repo/built, with the owner and name it has on GitHub.