Bevy vs CopperCube

Bevy is a free, open-source game engine built in Rust for 2D and 3D games, visualizations, interfaces, and other graphical applications. It uses a custom Entity Component System, with components represented as Rust structs and systems as Rust functions. The engine includes 2D and 3D rendering, a composable render graph, skeletal and morph-target animation, scene loading, hot reloading, UI, and audio playback. Its 2D renderer supports sprites, texture atlases, cameras, materials, custom shaders, and render pipelines. The 3D renderer includes lights, shadows, meshes, materials, cameras, and glTF loading. The ECS-driven UI framework uses flex-box layout and can be composed in code or scenes. Scene changes can update running applications; hot reloading currently covers scenes, textures, and meshes. Bevy targets Windows, macOS, Linux, web, iOS, and Android, and is available through crates.io with cargo add bevy. Users choose MIT or Apache 2.0 licensing, with no license fees or sales cuts. It remains in development, with possible missing features, sparse documentation, and breaking API changes about every three months.

CopperCube is a 3D authoring tool for making games and apps, including projects created without programming. Its maker cites first-person shooters, adventures, walkthroughs, simulators, and e-learning apps as possible uses. A click-based event and action system supports no-code interactions, while JavaScript can be used for scripting across publishing targets. Visual tools include terrain editing, real-time shadows, static lighting, moving vegetation, water rendering, particle effects, and a built-in lightmapper. CopperCube imports 3D formats including FBX, 3DS, OBJ, and X. Projects can be published as Windows apps, WebGL websites, macOS apps, and Android apps, although Android publishing is marked deprecated. The current editor is Windows-only starting with version 6.4; a macOS editor download is available for version 6.3. The free edition permits unlimited scenes and apps without royalties or a revenue limit. Professional costs €37, paid once, and Studio costs €126, paid once. The maker says projects made with any edition can be published and sold without royalties.