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Duo for Gmail

10x faster email using AI
Duo is a chrome extension that composes e-mail replies using artificial intelligence. It takes in the context of the email thread and generates high-quality responses.

Installation guide

Download the latest version of the extension from the #announcements channel on our discord:

Chrome, Arc Brave, Chromium browsers

2. Unzip the extension
3. Navigate to the “Manage extensions page”
4. Turn on developer mode
5. Click on “Load unpacked” and select the dist folder.
6. Navigate to Gmail and refresh the page. You’ll find the extension up and running


Navigate to Gmail and refresh the page. You’ll find the extension up and running


Emails are sensitive and contain your most private information. Duo does not store or log any of your email content or recipients. No one from our team can see or access your emails. We rely on a 3rd party service (GPT-3) to come up with the email responses. OpenAI engineered the system such that no one would be able to generate the data it reads verbatim.

No email data is shared with Duo unless you tap on one of the duo buttons and generate a response.


We’re currently doing a family/friends beta and we’d like to get as much feedback as possible, please don’t hesitate to share with us your feedback.
As as a small thank you for joining us early, we’re giving away Duo unlimited — for free.

What’s Next

We’re currently testing the product with a small group of people, getting feedback and iterating. Once the feedback is mostly positive we’d like to do a public rollout (goal is by end of November).


We’d like Duo augment your entire email workflow. Some of the feature requests include:
Supporting scheduling links like calendly and cron.
Auto composing replies before clicking any buttons.
Smart templates (transform static templates to be more fluid and fit the conversation context)

Long term

We’d like to transition in the long term to AI customer support and serve needs of B2Bs. Here’s an overview:

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