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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.

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

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.

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

Head to head

Metric	bitECS	Flecs	EnTT	Bevy ECS
Stars	1.5k	8.8k	13.2k	n/a
Weekly downloads	32.1k	n/a	n/a	286k
Download growth	+37%	n/a	n/a	+60%
Popularity score	56/100	72/100	75/100	67/100
Forks	119	629	1.1k	n/a
Open issues	23	59	13	n/a
Last commit	2mo ago	1w ago	1w ago	n/a
Latest version	0.4.0	n/a	n/a	0.20.1Oct 28, 2026
License	MPL-2.0	n/a	MIT	n/a
First released	2020	2018	2017	n/a
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, Bevy ECS.

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

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.

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

Metric	bitECS	Flecs	EnTT	Bevy ECS
Stars	1.5k	8.8k	13.2k	n/a
Weekly downloads	32.1k	n/a	n/a	286k
Download growth	+37%	n/a	n/a	+60%
Popularity score	56/100	72/100	75/100	67/100
Forks	119	629	1.1k	n/a
Open issues	23	59	13	n/a
Last commit	2mo ago	1w ago	1w ago	n/a
Latest version	0.4.0	n/a	n/a	0.20.1Oct 28, 2026
License	MPL-2.0	n/a	MIT	n/a
First released	2020	2018	2017	n/a
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, Bevy ECS.