thread.

Extension

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Freedom report

One barScore 6.0

Free tierA free tier is on its own pricing page
Open codeNo open-source code on record
Runs widely0 of 6 device platforms
DocumentedThinly documented

thread. is ranked #14 of 46 in AI email assistants on Freedom251. It runs on Browser extension. There is a free plan.

thread. plans and pricing

All plans

Free Free Uses your own OpenAI API key · No subscription from thread. usethreademail.com · 5 Oct 2026

Compared on AI email assistants

Free plan: Yes

Best thread. alternatives

See all 20

Two bars Mailbutler Smart Assistant Free tier No. 1$7/mo6.8 Two bars Perplexity Free tier No. 2$20/mo6.8 Two bars Spike Free tier No. 3$4/mo6.7 Two bars Superhuman Go Free tier No. 4$12/mo6.6 One bar Mailtwine Paid plans No. 5—6.5 Two bars Spark +AI Free tier No. 6$10/mo6.5

The record

Product: thread. is an AI email assistant that reads an email thread, drafts a reply in your voice, and inserts it into Gmail or Outlook.
Inbox context: It reads the full open email thread to draft a reply based on its messages.
Voice matching: Users can paste 3–5 past emails to help drafts match their writing style.
Modes: The site describes seven modes, including quick replies, follow-ups, tough conversations, cold outreach, meeting recaps, and three-variant drafts.
Draft insertion: Reply & insert opens the reply box, places the draft above the signature, and positions the cursor for review.
Streaming: Drafts appear word by word as they are generated.
Platforms: The extension runs in Chrome and works with Gmail and Outlook on the web.
AI billing: Users provide their own OpenAI API key and pay OpenAI directly for AI usage.
Data flow: Email content, prompts, and an optional voice profile are sent directly from the browser to OpenAI when a draft is requested.
Local storage: The API key, voice profile, templates, and panel preferences are stored in browser local storage.
Privacy: The maker says it operates no server, collects no usage analytics or telemetry, and has no user accounts.
Deletion: The privacy policy says uninstalling the extension removes its local storage data, while OpenAI may retain API prompts and responses under its own policy.
Support: The maker lists [email protected] for questions and says it will try to clarify the privacy policy by email.
Audience: The maker describes thread. as built for people who write a lot of email.
Price from: Free

Where it ranks on Freedom251

Best AI Email Assistants in 2026#14 of 46
Best AI Email Writing Tools in 2026#11 of 28

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Sources

usethreademail.com· checked 5 Oct 2026
usethreademail.com/privacy.html· checked 5 Oct 2026