# amethyst/specs

Specs - Parallel ECS

Repository: https://github.com/amethyst/specs
Canonical: https://ross.abutalabs.com/products/specs
Homepage: https://amethyst.github.io/specs/
Language: Rust
License: Apache-2.0
License Family: permissive
Topics: rust, ecs, parallel-ecs
Last push: 2024-06-07T18:32:55+00:00

## Health v2 (maintenance only)
Score: 23/100 (v2, computed 2026-09-03T02:20:16.233290+00:00)
- activity 0, release rhythm 8, longevity 100
- inputs: {"age_days": 3802, "days_push": 817, "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 2615, forks 215 (observed 2026-08-28T04:07:04.603814+00:00)

## What it is
Specs is an Entity-Component System (ECS) library for Rust with easy parallelism, flexible component storages, and system dependency/barrier support. It is designed for high performance in real-world applications such as games and simulations.

## Use cases
- build a game engine in rust with an entity component system
- run game systems in parallel across many entities
- manage component data with flexible storage strategies
- simulate large numbers of entities efficiently
- coordinate system execution order with dependencies and barriers

## When to choose
- you are writing a Rust game or simulation that benefits from data-oriented, parallel ECS architecture
- you need flexible, swappable component storages and loosely coupled system types
- you want automatic parallel dispatch of systems with explicit dependencies

## When to avoid
- you need a full-featured game engine rather than just an ECS library
- your project requires a very actively developed dependency with frequent releases
- you prefer a simpler sequential architecture where ECS parallelism adds unnecessary complexity

## Facets
- artifact type: library
- maturity: maintenance
- function: game-engine, concurrency, simulation
- domain: simulation
- platform: rust, cross-platform
- tags: ecs, entity-component-system, parallelism, data-oriented-design, game-development, algorithms

## Member repositories
- amethyst/specs (main) score 23

## Provenance
- Observed fields: from GitHub, fetched 2026-08-28T04:07:04.603814+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 2026-08-30T02:20:25.552420+00:00, confidence not recorded.
  - readme: https://github.com/amethyst/specs (fetched 2026-08-28T04:07:04.603814+00:00, sha baf40d537236)
  - homepage: https://amethyst.github.io/specs/ (fetched 2026-08-29T10:03:25.744237+00:00, sha b84e8ffa1b56)
- Data as of 2026-08-30T08:39:29.467469+00:00.