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.
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 :)