Finish thoughts before fingers hit keys. Working directly in your inbox as a browser extension, Lightfern nails the details that make emails feel like you - nicknames, sign-offs, your tone of voice - and pulls context from past threads to finish sentences the way you would. All with zero data retention by default.
I’m Doug - I was OpenAI’s first hire in London but left to co-found Lightfern.
The problem:
AI-driven communication isn’t authentic. You want to communicate clearly and thoughtfully.
But wording your thoughts is time-consuming.
Lightfern is the telepathic AI writing tool. We started with a simple idea: Cursor, but for email. Today, we’re rolling out public availability for Gmail users via our browser extension.
Finish thoughts before fingers hit keys. Lightfern nails the details that make emails feel like you - nicknames, sign-offs, your usual tone - and pulls context from past threads to finish your sentences the way you would.
Build stronger relationships. Lightfern keeps you thoughtful, whether it’s remembering your VC’s ski trip to Switzerland or a long-forgotten invoice number.
Redraft and edit without ever leaving the page. Chat with AI that already has full context.
All this with zero data retention by default.
Lightfern is the best autocomplete model in the world. Nothing else comes close in contextual awareness or speed.
We’ll be here all day to answer your questions and hear your thoughts, so please reach out and say hi :)
About Lightfern for Email on Product Hunt
“The telepathic AI writing tool”
Lightfern for Email launched on Product Hunt on February 3rd, 2026 and earned 168 upvotes and 46 comments, placing #8 on the daily leaderboard. Finish thoughts before fingers hit keys. Working directly in your inbox as a browser extension, Lightfern nails the details that make emails feel like you - nicknames, sign-offs, your tone of voice - and pulls context from past threads to finish sentences the way you would. All with zero data retention by default.
On the analytics side, Lightfern for Email competes within Email, Writing and Artificial Intelligence — topics that collectively have 562k followers on Product Hunt. The dashboard above tracks how Lightfern for Email performed against the three products that launched closest to it on the same day.
Who hunted Lightfern for Email?
Lightfern for Email was hunted by Chris Messina. A “hunter” on Product Hunt is the community member who submits a product to the platform — uploading the images, the link, and tagging the makers behind it. Hunters typically write the first comment explaining why a product is worth attention, and their followers are notified the moment they post. Around 79% of featured launches on Product Hunt are self-hunted by their makers, but a well-known hunter still acts as a signal of quality to the rest of the community. See the full all-time top hunters leaderboard to discover who is shaping the Product Hunt ecosystem.
For a complete overview of Lightfern for Email including community comment highlights and product details, visit the product overview.
Chris Messina
Hey Product Hunt 👋
I’m Doug - I was OpenAI’s first hire in London but left to co-found Lightfern.
The problem:
AI-driven communication isn’t authentic.
You want to communicate clearly and thoughtfully.
But wording your thoughts is time-consuming.
Lightfern is the telepathic AI writing tool. We started with a simple idea: Cursor, but for email. Today, we’re rolling out public availability for Gmail users via our browser extension.
Finish thoughts before fingers hit keys. Lightfern nails the details that make emails feel like you - nicknames, sign-offs, your usual tone - and pulls context from past threads to finish your sentences the way you would.
Build stronger relationships. Lightfern keeps you thoughtful, whether it’s remembering your VC’s ski trip to Switzerland or a long-forgotten invoice number.
Redraft and edit without ever leaving the page. Chat with AI that already has full context.
All this with zero data retention by default.
Lightfern is the best autocomplete model in the world. Nothing else comes close in contextual awareness or speed.
🪴 Install now for unlimited free access during our beta: https://lightfern.com/.
We’ll be here all day to answer your questions and hear your thoughts, so please reach out and say hi :)