Mosaic raises $3.8M seed

Mosaic just raised a $3.8 million seed round two days after its founders’ company page on Y Combinator updated with the news, and it paired the financing with two customer partnerships instead of just a demo video. (mosaic.so) (ycombinator.com) The two names are TubeScience and News Corp, which puts Mosaic in front of both ad agencies and publishers at the same time. Mosaic says TubeScience is Meta’s largest ad creative partner, producing 8,000 videos a month and reaching 100 million views a day. (mosaic.so) News Corp is using Mosaic to automate short-form clips from long video, which is one of the most repetitive jobs in modern publishing. That means the product is not just for YouTubers cutting highlight reels at home; it is being sold into newsroom workflows where speed and volume are measured every day. (mosaic.so) Mosaic is trying to replace part of the old video-editing routine where a human scrubs through hours of footage on a timeline, drags clips around, adds captions, and exports versions one by one. Its pitch is a canvas where users build video-editing agents that can run those steps on autopilot and then hand the result back to a familiar editor for final tweaks. (mosaic.so) (news.ycombinator.com) The company was founded in 2024 by Adish Jain and Kyle Wade, two former Tesla engineers who started the project after filming Cybertrucks in Palo Alto and getting stuck with hours of raw footage. Y Combinator lists Mosaic as a Winter 2025 company with three employees based in San Francisco. (ycombinator.com) That origin story explains why Mosaic talks less about making whole videos from text and more about chewing through existing footage faster. On its site, the company says users can run edits on autopilot, create multiple variants from the same raw material, and then jump into a timeline editor when they want manual control. (mosaic.so) The partnerships matter because video software usually dies in the gap between a flashy prototype and a paying workflow. TubeScience already operates at industrial scale, and News Corp already has a constant supply of long-form footage that needs to become short clips, so both partners give Mosaic a real test of whether the software saves labor instead of just looking clever in a product demo. (mosaic.so) This is also landing in a market where investors are still writing large checks for tools that automate media work. TechCrunch reported on March 24 that Mirage, the company behind the video-editing app Captions, raised $75 million in growth financing, which shows capital is still flowing into software that compresses editing time. (techcrunch.com) Mosaic is much earlier than Captions, but its bet is narrower and more operational: not “make a video,” but “turn this pile of footage into many usable edits.” If that works for agencies buying ads and publishers cutting clips, the business starts to look less like creator software and more like workflow infrastructure. (mosaic.so 1) (mosaic.so 2) That is why a $3.8 million seed round can carry more weight than the number suggests. A three-person startup with Y Combinator backing, one agency partner moving 8,000 videos a month, and one media partner inside News Corp has already picked the two places where editing bottlenecks are expensive enough to pay for automation. (ycombinator.com) (mosaic.so)