thread.
thread.: A free Chrome extension for contextual, voice-matched email drafts. Ranked #18 of 28 in AI Email Writing Tools by our editors (6.6/10); pricing: Free plan; best for free Gmail and Outlook reply drafting.
At a glance
- Editor score6.6 / 10
- PricingFree plan
- Best forFree Gmail and Outlook reply drafting
- Free planYes
- Paid fromFree
- Tone controlsYes
- Facts checked20 Sep 2026
Where it wins
- Reads full threads before drafting replies
- Builds a voice profile from past emails and style answers
- Supports replies, follow-ups, outreach, recaps, and variants
Where it doesn't
- Requires your own OpenAI API key
- Works through a Chrome browser extension
- Focused on Gmail and Outlook email workflows
Our verdict on thread.
thread. is a free Chrome browser extension for drafting email replies inside Gmail and Outlook. It reads the full open thread, takes a short prompt describing the intended response, and generates a draft using the user's OpenAI API key. It is aimed at people who want contextual assistance for everyday replies, follow-ups, difficult conversations, outreach, meeting recaps, and alternative versions of a message.
The drafting workflow focuses on context and personalization. thread. can use past emails and answers about writing style to create a voice profile, while its modes cover quick replies, follow-ups, tough conversations, outreach, recap, and variants. Generated text streams in real time, and a one-click action inserts the draft into the reply box. That combination suits users who want more than generic prompts but still want to guide each message with a short instruction.
Pricing is straightforward: the published Free plan has no subscription from thread. and uses the user's own OpenAI API key, with API usage paid directly to OpenAI. The extension stores the API key and preferences locally in the browser. Its platform fit is specific rather than broad: it connects with Gmail, Outlook, and the OpenAI API through Chrome. Choose thread. if you want free, thread-aware drafting with a reusable voice profile and multiple email modes. Choose another option if you need a standalone application, broader mail-client coverage, or a workflow that does not require managing an OpenAI API key.
Your product? Our editors can test thread. in depth and publish a review, labelled as paid · from $149/mo →
thread. pricing
All 1 thread. plans and prices →
thread. fact sheet
| Free plan | Yes |
|---|---|
| Paid from | Free |
| Tone controls | Yes |
| Custom instructions | Yes |
| Email context input | Thread |
| Browser extension | Yes |
| Mail client support | Both |
| Supported languages | Not verified |
| Deployment | Browser extension |
| Platforms | Chrome extension |
| Support | |
| Built for | Solo, Small business (editorial estimate) |
| Integrations | 3 integrations: Gmail, Outlook, OpenAI API |
| Pricing | Free plan (source) |
| Website | usethreademail.com |
| Facts checked | 20 Sep 2026 |
thread. integrations
thread. lists 3 integrations on its own site.
- Gmail
- Outlook
- OpenAI API
Alternatives to thread.
- WPS AI Email WriterA free, unlimited prompt-based drafter for common email messages across six platforms.9.1
- MailMaestroA practical AI assistant for writing, organizing, and following up across Gmail and Outlook.8.8
- LavenderA sales-focused email coach with drafting, scoring, personalization, and team coaching.8.5
See all thread. alternatives →
Also Ranked In
thread. is ranked in 2 of our directories.
Used thread.? Be the first to review it
The editor score above is our own research. What this page doesn't have yet is a reader's view — what you used thread. for, what worked and what didn't. No stars are seeded and no review is paid for; an editor reads every one before it appears.
Write a reviewTwo minutes · verified accounts only · read by an editor before it appears
Featured on iTechGuides
thread. is listed in our AI Email Writing Tools directory. Add the badge to your site — it links back to this page.
<a href="https://www.itechguides.com/products/thread/"><img src="https://www.itechguides.com/best/badge/thread.svg" alt="Featured on iTechGuides" width="230" height="46"></a>
Reviewed by iTechGuides Editors · Editorial team · Updated Oct 2026
Advertiser disclosure: iTechGuides is reader-supported. Vendors can pay for top positions in our rankings and for a place on other products' pages, and we may earn a commission when you click some links. Bought places stand at the number bought; this page and our disclosure say so. Paying vendors may get a fuller, more detailed review from our editors, and that review can change their score. How we rank.
Last updated · How we research and update