thread.

What thread. is

thread. is a browser extension that helps draft email replies in Gmail or Outlook. It reads the full open email thread and uses those messages as context for a response. Users can paste three to five past emails to help drafts follow their writing style. The site describes seven modes, including quick replies, follow-ups, tough conversations, cold outreach, meeting recaps, and drafts with three variants. Drafts appear word by word. With Reply & insert, the extension opens the reply box, puts the draft above the signature, and positions the cursor for review. The extension is free, with no subscription from thread.; users provide their own OpenAI API key and pay OpenAI directly for AI usage. When a draft is requested, email content, prompts, and an optional voice profile are sent from the browser directly to OpenAI. The maker says the extension has no server, user accounts, analytics, or telemetry. The API key, voice profile, templates, and panel preferences are stored in browser local storage. Uninstalling removes that local data, though OpenAI may retain prompts and responses under its own policy. The maker describes thread. as built for people who write a lot of email.

Who it suits

thread. suits people who write a lot of email and want replies drafted from the full conversation. It is for Gmail or Outlook users who are comfortable supplying their own OpenAI API key and paying OpenAI directly for usage.

Getting started

1. Visit the thread. website.
2. Install the browser extension.
3. Provide your own OpenAI API key.
4. Optionally paste three to five past emails to create a voice profile.
5. Open an email thread in Gmail or Outlook and request a draft.
6. Review the inserted draft before sending.

Verdict

Choose thread. if you write a lot of email and want a draft based on the conversation in Gmail or Outlook. The extension itself has no subscription, but you need an OpenAI API key and pay OpenAI for usage. Consider its data flow: requested drafts send email content and prompts to OpenAI, which may retain them under its policy.