Mosaic

What it does

Mosaic is an agentic video editing platform that enables users to create automated video editing workflows. It offers a visual canvas for building editing pipelines, an API for programmatic control, and agent skills that integrate with tools like OpenClaw and Claude Code. The platform can handle rough cuts, clipping, reframing, AI avatars, and transcoding. It also supports triggers from Google Drive, S3, Dropbox, and YouTube, and integrates with MAMs like Mimir, Iconik, and Premiere. Recently, Mosaic introduced Motion, a video agent for tasteful motion design.

Who it is for

Mosaic is designed for marketers, agencies, content creators, and media companies who need to produce high volumes of video content efficiently. The website mentions trust from over 1,000 marketers, agencies, and creators, and lists customers including The Sun, News UK, talkSPORT, and TubeScience. Testimonials highlight use cases for podcast content creation, social media clips, and enterprise video production.

Why it matters

Traditional video editing is time-consuming and manual. Mosaic automates repetitive tasks, allowing users to run video edits on autopilot and A/B test multiple variants from the same raw footage. The platform claims to accelerate tasks from hours to seconds using AI agents powered by Gemini 2.0 Flash. For media companies like News UK, Mosaic helped triple vertical video output on talkSPORT. The Y Combinator managing partner called it "the best product in our YC group" and predicted it will become the default way to edit video.

Launch signal

Mosaic is part of Y Combinator's Winter 2025 batch. It raised a $3.8M seed round from Y Combinator, Mayfield, Elevation Capital, and angels from OpenAI and Google DeepMind. The company launched on Hacker News with the title "Launch HN: Mosaic (YC W25) – Agentic Video Editing." The platform is live and accepting users via edit.mosaic.so.

Brand and naming

The name "Mosaic" suggests assembling many pieces (clips, effects, workflows) into a coherent whole, which aligns with its agentic editing approach. The tagline "Agentic Video Editing" positions the product as proactive and autonomous, differentiating from traditional editing tools. The brand emphasizes automation and scalability, with a clean, modern visual identity.