✦ Chrome Extension
AI writing anywhere you type, in your own voice.
One Chrome extension. 13 editable AI actions, custom skills, unlimited grammar checks, and PDF summaries — in Gmail, Notion, Google Docs, Slack, LinkedIn, X, Substack, or any text field on the web.
Free · Pro from $3.99/mo · No credit card required
One extension that follows your voice everywhere
01
Works on every site you write on
Gmail, Notion, Google Docs, Slack, LinkedIn, X, Substack, ChatGPT, your CMS, your CRM — any text field. Same 13 actions everywhere.
02
13 editable AI actions
Rewrite, Formal, Casual, Continue writing, Explain, and more. Every one is editable — open the prompt in Personalize and rewrite it.
03
Custom skills travel with you
Save a prompt once — 'Turn into a tweet thread', 'Rewrite for a customer email' — and trigger it in the extension on every site.
04
Summarize anything in the browser
PDFs, articles, long email threads — get a TL;DR plus bullets with page citations. Saved as a document you can chat with later.
✦ Where it works
Every text field on the web
Inbox & Messaging
- Gmail
- Outlook
- Slack
- LinkedIn DMs
- X
- WhatsApp Web
Docs & Knowledge
- Google Docs
- Notion
- Confluence
- Substack
- Medium
- PDFs & web articles
Work Tools
- GitHub
- Linear
- Jira
- Trello
- HubSpot
- Salesforce
- CMS · CRM
Read the full comparison
See how it compares: Best AI Paraphrasing Tools in 2026 →✦ Frequently Asked
Questions people ask
It brings HyperWords' 13 editable AI actions, custom skills, and PDF summarizer into every text field on the web. Available in Gmail, Notion, Google Docs, Slack, LinkedIn, X, Substack — anywhere you type, you can rewrite, proofread, summarize, or run custom skills in your voice.
The extension is free to install. A free account is required to save your Voice & Style profile, sync custom skills, and access summaries — no credit card needed. Pro is $3.99/mo for higher daily limits.
Grammarly focuses on grammar. HyperWords provides grammar plus 13 editable rewrite modes, custom AI skills, PDF/URL summaries with chat, and costs one-third of Grammarly's Pro price.
Wordtune locks you into preset rewrite styles. HyperWords allows editing any built-in mode's prompt, includes custom skills (Wordtune doesn't), PDF summaries with chat, and costs less than half Wordtune's price.
Any site with a text field: Gmail, Outlook, Slack, LinkedIn, X, WhatsApp Web, Google Docs, Notion, Confluence, Substack, Medium, GitHub, Linear, Jira, HubSpot, your CMS, or CRM.
The extension only reads text when triggered — no browsing surveillance. Text sent to AI is processed in real time and not used for model training. No site tracking or data sales. See our Privacy Policy for details.
Currently: Chrome and Chromium-based browsers (Edge, Brave, Arc). Firefox and Safari are on the roadmap. The web app works in any modern browser.
Try it free — no credit card.
Open the studio or install the Chrome extension. Your voice, every surface.