Mosaic

Mosaic is an applied AI lab behind Motion, a general video agent for editing, motion design and video understanding. Publishers and creator teams use it to raise short-form output, backed by $4.3M in funding from Y Combinator and others.

Mosaic is an applied AI product lab whose main product is Motion, a video agent aimed at editing, motion design and video understanding. The lab describes its work as sitting at the frontier of agentic orchestration and multimodal understanding, meaning software that interprets footage and then acts on it, instead of waiting for a person to drive every timeline decision. The mosaic.so site works mainly as a company and research hub, while the product itself is reached through motion.so. The audience skews toward media and content operations. The homepage lists teams at The Sun, News UK, talkSPORT, New York Post, News Corp, TubeScience and Backstage Pass, and quotes a digital director at News UK saying vertical video output at talkSPORT tripled. A co-founder of an artist collective reports posting 30+ times in a month. The site also claims more than 100,000 users, and a post references a video API, which suggests programmatic use alongside the interactive agent. The homepage does not document how that API is accessed. In practice, Motion is positioned as a general video agent: a user brings footage and a goal, and the agent handles editing and motion design tasks while drawing on its understanding of what is in the video. The research section gives more detail on adjacent work, including captions placed with awareness of what is on screen, long-context video understanding, and writing on sound design. Pricing, supported file types and export options are not stated on the homepage, so buyers need to check motion.so directly. Among alternatives, Motion competes with timeline editors that bolt on AI features and with template-driven short-form clip tools. Its pitch is agentic orchestration across the whole job rather than a single automated feature. The company raised $4.3M in total funding, backed by Y Combinator, Mayfield Fund, Elevation Capital and News Corp, which signals a funded team but also an early-stage product still defining its scope.