Chroma, a startup building a new type of audiovisual entertainment for mobile devices, has been sold.

The company, which had financial backing from Twitter and Medium co-founder Biz Stone as well as Pinterest co-founder Evan Sharp, is headed to London-based audio technology company Bronze, an AI music startup.

Founded by record producer Lex Dromgoole-who's shared his optimism about AI in music-and composer Gwilym Gold, Bronze makes tools that artists use to package music in a "generative, interactive, or personalized experience." Bronze has tested its engine with Beatport, XL Recordings, A24 Film, musicians Disclosure, Arca, and Jai Paul, as well as Oscar-winning sound designer Nicolas Becker.

Bronze claims to have collaborated with Chroma prior to the acquisition on an app called "Lux Aeterna," a virtual world that presented an audiovisual experience intended for exploring the music from Venezuelan producer, DJ, singer, and songwriter Arca in a "meditative digital space." The music responds to changes in player movement, position, and activity, meaning one can fly through the virtual space of this application, encountering sounds as part of their journey.

Terms of the deal were not disclosed, but all Chroma stock will be converted to Bronze stock. Chroma co-founder Andreas Pihlström will join Bronze's advisory board, but the acquisition was focused more on IP than talent.

On that front, Bronze says an API will be created for the engine that was built for the Lux Aeterna so that similar functionality can plug into any game-building platform. The acquisition will also help to scale the visual capabilities of Bronze's engine, which the company hopes will allow it to gain more traction in interactive entertainment in the future.

As we enter an age of generative visual and auditory environments, the acquisition of Chroma will allow Bronze to give artists, musicians, and creative-spirited individuals the tools to express themselves with a new generation of creatively responsive generative tools," said Sharp in a statement.

According to PitchBook, Chroma had raised $7.19 million in seed over two rounds, completed in May 2022. Investors include 14W, Adjacent, Hidden Ventures, Singular and SpotiAngels, plus Biz Stone and Pinterest co-founders Evan Sharp and Ben Silbermann. Sharp also invested in Bronze in August 2024.