HyperWrite

HyperWrite is a browser-first AI writing assistant from OthersideAI, described on the site as an assistant with autocomplete, web search and citations. The mechanics: while you type into Google Docs, email clients, social platforms and similar editors, it offers personalized, context-aware sentence completions — it continues your paragraph rather than making you prompt one; AutoWrite carries that drafting into long-form documents; and Scholar mode answers from live web search with cited sources instead of model memory, with additional agent-like helpers that read pages as you work. The headline number on the site is Premium at $19.99 per month, with a free tier and a trial as the doorway.

Suited to people who write every day inside the browser — email, docs, LinkedIn, forms — and want help without leaving the tab or learning prompt engineering; less suited to writers who want a controlled drafting environment, where a chat tool with a deliberate plan is cleaner. Two cautions. Personalization and citation are exactly the features hardest to honestly demonstrate, so test them on your own writing before paying for the year; and web-reading agents still get things confidently wrong, so verify anything load-bearing before you ship it. If what you need is brand-consistent marketing copy at scale, dedicated suites play heavier. HyperWrite's bet is living next to your cursor — depending on how you write, that is either its entire value or its ceiling.