HyperWrite is an AI writing assistant and browser agent from OthersideAI. See its 2026 features, pricing plans and top competing tools in this review.
HyperWrite is an AI writing assistant and browser-based AI agent built by OthersideAI, a New York company founded in 2020 by Matt Shumer, Jason Kuperberg and Miles Feldstein. It launched in July 2020 around TypeAhead, an inline autocomplete feature that suggests the rest of a sentence as gray text a user accepts with Tab.
OthersideAI raised a $2.8 million seed round in March 2023 led by Madrona Venture Group, bringing total disclosed funding to roughly $5.4 million, and later drew attention in the AI research community for releasing Reflection 70B, an open-source large language model tuned with a reflection-tuning technique.
The product has grown from a pure autocomplete tool into a fuller AI assistant spanning a web app, a Chrome extension, and an agent mode that can take actions in the browser on a user's behalf.
TypeAhead autocomplete and an AI chat assistant work directly inside Gmail, Google Docs, ChatGPT and most other web text fields through HyperWrite's Chrome extension, so users do not need to copy text in and out of a separate app.
Custom Personas let users define a persistent tone, role or writing style the assistant should consistently apply, while a library of hundreds of pre-built AI tools covers specific use cases like SEO blog writing, email responses and academic research.
The AI Personal Assistant, or agent mode, goes beyond text generation: it can autonomously drive the browser through multi-step tasks, such as researching a topic, opening a document and pasting in a summary, without the user performing each step manually.
HyperWrite runs on a freemium model. The free tier offers limited AI messages and basic TypeAhead access, while Premium costs $19.99 per month, or $16 per month billed annually, and includes 250 AI messages per month, citations with real-time information, three custom personas and unlimited TypeAheads.
The Ultra tier costs $44.99 per month, or $29 per month billed annually, and removes the AI message cap entirely, expands custom personas to ten, and grants first access to experimental features such as new agent capabilities.
HyperWrite offers a free tier with limited features; full access to unlimited TypeAheads and more AI messages requires the Premium or Ultra paid plans.
Premium is $19.99/month, or $16/month billed annually, and Ultra is $44.99/month, or $29/month billed annually.
HyperWrite is built by OthersideAI, founded in New York in 2020 by Matt Shumer, Jason Kuperberg and Miles Feldstein.
Yes, its Chrome extension brings autocomplete and chat assistance into Gmail, Google Docs, ChatGPT and most other web text fields.
It is an agent mode that can autonomously use the browser to complete multi-step tasks, such as researching a topic and drafting a document.
Yes, the company released Reflection 70B, an open-source large language model, in 2024.