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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.

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

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

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

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

Head to head

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

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

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

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

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

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