Marble

Built by World Labs, Marble converts text, single or multiple images, or video into fully navigable, persistent 3D worlds. It provides AI-native editing tools and a hybrid 3D editor, allowing users to sketch a basic layout and let the AI fill in visual details. Outputs can be exported as Gaussian splats, triangle meshes, or video for integration into game engines or creative pipelines.

Strengths include flexible inputs, scene persistence, built-in editing, and multiple export formats—ideal for rapid concept prototyping. Weaknesses are evident: large scenes often show distracting artifacts when rotating the view, while enclosed small scenes work better; the service crashed under high load during early access, indicating limited stability.

During public beta, generation and online exploration are free, but downloading 3D assets requires a Pro subscription. According to media reports, the Pro plan initially costs about ¥7 for the first month, though subsequent pricing and feature details have not been officially disclosed.

It suits indie developers, game designers, and educators who need quick 3D prototypes, concept demos, or educational materials.