HyperWrite (built by OthersideAI) is a personal AI writing assistant that helps users draft, rewrite, and edit content while also offering AI agents that can autonomously complete web-based research and writing tasks. Its features include an AI autowriter, document editor, summarizer, tone and style tools, and a Chrome extension that brings assistance into any text field, along with agentic flows that can browse and act on the user's behalf. Founded by Matt Shumer and Jason Kuperberg, the New York company positions HyperWrite for professionals and everyday users who want flexible, general-purpose writing and automation. HyperWrite raised a $2.8M seed round in March 2023 led by Madrona Venture Group, with backers including WndrCo and Active Capital, for roughly $5.4M raised to date.