# shuttle-hq/synth

The Declarative Data Generator

Repository: https://github.com/shuttle-hq/synth
Canonical: https://ross.abutalabs.com/products/synth
Homepage: https://www.getsynth.com/
Language: Rust
License: Apache-2.0
License Family: permissive
Topics: rust, test-data-generator, synthetic-data, json, data-generation, realistic-data, postgres, hacktoberfest
Last push: 2024-09-27T15:51:09+00:00

## Health v2 (maintenance only)
Score: 23/100 (v2, computed 2026-09-02T17:46:02.011165+00:00)
- activity 0, release rhythm 8, longevity 100
- inputs: {"age_days": 2215, "days_push": 705, "days_rel": null, "gap_med": null, "n_releases_24m": 0}
- flags: none
- formula: round(0.45*activity + 0.35*rhythm + 0.20*longevity); archived -> min(score, 10)

## Adoption (not part of the score)
Stars 1484, forks 111 (observed 2026-08-28T04:04:51.392806+00:00)

## What it is
Synth is a declarative data generator written in Rust that produces realistic synthetic test data from a version-controllable data model. It can import schemas from existing databases like Postgres, MySQL, and MongoDB and scale to millions of rows.

## Use cases
- generate realistic test data for a new app schema
- seed a database with synthetic data instead of production data
- create synthetic data for integration testing and QA
- generate millions of rows to test database scaling
- infer a data model from an existing Postgres or MongoDB database
- version control test data generation as code

## When to choose
- you need realistic, constraint-based synthetic data for development or testing
- you want to avoid using production data in QA
- you need to seed SQL or NoSQL databases at scale
- you want data generation defined declaratively in git

## When to avoid
- you need production-grade anonymization of real data rather than synthetic generation
- you only need simple static fixtures or mocks
- you need a GUI-based data generation tool

## Facets
- artifact type: cli-tool
- maturity: active
- function: data-generation, testing, database, etl
- domain: developer-tools, databases, testing
- platform: cli, rust, windows
- tags: synthetic-data, test-data, declarative-data-model, postgres, mysql, mongodb, fake-data, schema-inference, data-engineering, linux, macos

## Member repositories
- shuttle-hq/synth (main) score 23

## Provenance
- Observed fields: from GitHub, fetched 2026-08-28T04:04:51.392806+00:00.
- Health v2: computed from the inputs above; adoption is never an input.
- Inferred fields (summary, facets, guidance): AI-extracted, prompt v1, taxonomy v1, on 2026-08-30T04:34:00.975740+00:00, confidence not recorded.
  - readme: https://github.com/shuttle-hq/synth (fetched 2026-08-28T04:04:51.392806+00:00, sha aa41bf6fed84)
- Data as of 2026-08-30T08:39:29.467469+00:00.