Lightfern - AI Email

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

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.