Lightfern - AI Email

Tracking since Apr 1, 2026.

Changelog

• Jun 5, 2026
  description

  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.
  
  Build stronger relationships. Lightfern keeps you thoughtful, whether it's remembering your VC's ski
  trip to Switzerland or a long-forgotten invoice number. Pull information without the deep-dive.
  
  Redraft and edit without leaving the page. Lightfern sees what you see, so you can edit and redraft
  without leaving your inbox.
  
  Code-switch between private and professional inboxes. Add multiple emails to a single Lightfern
  account and still enjoy full personalisation, based on your current context.
  
  === How to use Lightfern ===
  
  Press tab to accept whole Ultracomplete suggestions or → to accept a single word. Keep typing to
  ignore suggestions and generate new ones. To open and close our Inline Composer, use the shortcut
  Ctrl+Cmd+L.
  
  === Privacy and security ===
  
  Lightfern is built with security at its centre. This means Zero Data Retention by default.
  
  Unless you explicitly opt-in to sharing your data with us for training, your email data is only used
  for transient processing to provide AI suggestions; we do not retain any copies on disk and do not
  train on your data. By default, processing data is only held in volatile memory and automatically
  purged within minutes.
  
  Access tokens (such as your Google login) also stay only on your machine and Lightfern's servers
  cannot fetch them.

  Your voice, for any email. Powered by the world’s best autocomplete model.
  
  → Pull information from the comfort of your draft:
  Search for invoice numbers, locations, and other specific details without wading through your inbox. Just press Ctrl+Cmd+L on Mac or Ctrl+Alt+L on Windows and search via Inline Composer.
  
  → Redraft and edit without switching tabs:
  Prompt Inline Composer to turn bullet points into fully drafted copy, all in your own tone of voice.
  
  → Finish thoughts before fingers hit keys:
  Using the world’s most powerful autocomplete model, Lightfern finishes your sentences the way you would, including nicknames, sign-offs, and turns of phrase. Press Tab to accept a whole suggestion or → to accept a single word.
  
  → Personalise your experience:
  Connect multiple email inboxes, choose whether or not to use em-dashes, and set your working hours so Lightfern only suggests meeting times that work for you.
  
  ————————————
  
  Privacy and security
  
  Lightfern is built with security at its centre. This means Zero Data Retention by default.
  
  Unless you explicitly opt-in to sharing your data with us for training, your email data is only used for transient processing to provide AI suggestions; we do not retain any copies on disk and do not train on your data. By default, processing data is only held in volatile memory and automatically purged within minutes.
  
  Access tokens (such as your Google login) also stay on your machine and Lightfern's servers cannot fetch them.

• Jun 5, 2026
  short_description

  The telepathic AI writing tool. Finish thoughts before fingers hit keys.

  Your voice, for any email. Powered by the world's best autocomplete model.

• Apr 5, 2026
  permissions

  identity, declarativeNetRequestWithHostAccess, storage, scripting, webRequest, alarms

  identity, declarativeNetRequestWithHostAccess, storage, scripting, webRequest, cookies

Permissions & access

Permissions

identitydeclarativeNetRequestWithHostAccessstoragescriptingwebRequestcookies

Host access

<all_urls>

Screenshots

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