Source: https://seerepo.com/compare/chroma-core/chroma/vs/nautechsystems/nautilus_trader
Markdown source: https://seerepo.com/compare/chroma-core/chroma/vs/nautechsystems/nautilus_trader.md
Description: chroma and nautilus_trader share 7 technologies: arrow, sqlx, object_store, Tokio, parquet, tracing, and tracing-subscriber. Both are written in Rust.

# chroma vs nautilus_trader

chroma and nautilus_trader share 7 technologies: arrow, sqlx, object_store, Tokio, parquet, tracing, and tracing-subscriber. Both are written in Rust.

- [chroma-core/chroma](https://seerepo.com/r/chroma-core/chroma): Search infrastructure for AI
- [nautechsystems/nautilus_trader](https://seerepo.com/r/nautechsystems/nautilus_trader): Production-grade Rust-native trading engine with deterministic event-driven architecture

## What they share and what sets them apart

- In common: arrow, sqlx, object_store, Tokio, parquet, tracing, tracing-subscriber
- Only in chroma: axum, FastAPI, aws-sdk-s3, pgx, pq, s3, sqlx-postgres, sqlx-sqlite, foyer, 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, github.com/pingcap/log, go.uber.org/zap, tracing-opentelemetry, github.com/rs/zerolog, google-cloud-googleapis, OpenTelemetry, 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 nautilus_trader: datafusion, Redis, redb, tabled, ed25519-dalek, csv, log, bollard

## Side by side

| | chroma | nautilus_trader |
|---|---|---|
| Size | 474,465 lines written, 886 code files | 2,504,588 lines written, 2,347 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 |
| Activity | Last push November 7, 2026, 4,542 commits, 29,650 stars | Last push November 7, 2026, 21,899 commits, 31,337 stars |
| Tests | 345 test files. 31% of its code files have a test that imports them | 580 test files. 18% 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 nautilus_trader?

nautilus_trader, with 2,504,588 lines written; chroma has 474,465.

The proof: [nautechsystems/nautilus_trader's code at commit fa4c7a8](https://github.com/nautechsystems/nautilus_trader/tree/fa4c7a8cf16d8b4061516fe3c1f1fc9fef6a6e8f)

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

nautilus_trader, with 31,337 stars; chroma has 29,650.

The proof: [nautechsystems/nautilus_trader on GitHub](https://github.com/nautechsystems/nautilus_trader)

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

nautilus_trader, with 580 test files; chroma has 345.

The proof: [nautechsystems/nautilus_trader's code at commit fa4c7a8](https://github.com/nautechsystems/nautilus_trader/tree/fa4c7a8cf16d8b4061516fe3c1f1fc9fef6a6e8f)

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

Both got their last push on November 7, 2026.

The proof: [nautechsystems/nautilus_trader's commits on GitHub](https://github.com/nautechsystems/nautilus_trader/commits)

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

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)
- nautechsystems/nautilus_trader: Read on November 7, 2026, at commit fa4c7a8 (https://github.com/nautechsystems/nautilus_trader/tree/fa4c7a8cf16d8b4061516fe3c1f1fc9fef6a6e8f)

## 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.