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Side-by-side comparison

Pick up to four tools and compare adoption, momentum and maintenance at a glance. The crown marks the leader in each row.

Bevy's standalone ECS crate, usable outside the engine for ergonomic data-oriented Rust code.

Fast, lightweight C/C++ entity component system with relationships, queries and a web explorer.

Header-only C++ ECS library known for speed; used in Minecraft (Bedrock) and many engines.

Tiny, high-performance ECS for JavaScript/TypeScript built on typed arrays.

Head to head

Metric	Bevy ECS	Flecs	EnTT	bitECS
Stars	n/a	8.8k	13.2k	1.5k
Weekly downloads	286k	n/a	n/a	32.1k
Download growth	+60%	n/a	n/a	+37%
Popularity score	67/100	72/100	75/100	56/100
Forks	n/a	629	1.1k	119
Open issues	n/a	59	13	23
Last commit	n/a	1w ago	1w ago	2mo ago
Latest version	0.20.1Oct 28, 2026	n/a	n/a	0.4.0
License	n/a	n/a	MIT	MPL-2.0
First released	n/a	2018	2017	2020
Signals	None	Popular	Popular	None
Listed in	Game Development › ECS & Game Architecture	Game Development › ECS & Game Architecture	Game Development › ECS & Game Architecture	Game Development › ECS & Game Architecture

Hover for exact values; switch to log scale for tools of very different sizes. Not shown (no comparable download data): Flecs, EnTT, bitECS.

Bevy's standalone ECS crate, usable outside the engine for ergonomic data-oriented Rust code.

Fast, lightweight C/C++ entity component system with relationships, queries and a web explorer.

Header-only C++ ECS library known for speed; used in Minecraft (Bedrock) and many engines.

Tiny, high-performance ECS for JavaScript/TypeScript built on typed arrays.

Metric	Bevy ECS	Flecs	EnTT	bitECS
Stars	n/a	8.8k	13.2k	1.5k
Weekly downloads	286k	n/a	n/a	32.1k
Download growth	+60%	n/a	n/a	+37%
Popularity score	67/100	72/100	75/100	56/100
Forks	n/a	629	1.1k	119
Open issues	n/a	59	13	23
Last commit	n/a	1w ago	1w ago	2mo ago
Latest version	0.20.1Oct 28, 2026	n/a	n/a	0.4.0
License	n/a	n/a	MIT	MPL-2.0
First released	n/a	2018	2017	2020
Signals	None	Popular	Popular	None
Listed in	Game Development › ECS & Game Architecture	Game Development › ECS & Game Architecture	Game Development › ECS & Game Architecture	Game Development › ECS & Game Architecture

Hover for exact values; switch to log scale for tools of very different sizes. Not shown (no comparable download data): Flecs, EnTT, bitECS.