The telepathic AI writing tool
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.
The Inline Composer allows users to draft full replies, adjust tone, ask questions about email threads, and get feedback—all within the email client using Ctrl+Cmd+L. No tab switching or copy-pasting required.
Lightfern builds inbox-wide context by remembering contact history, previous discussions, and personal details. This enables users to craft authentic follow-ups that feel personal and relevant, improving relationship-building in sales and professional outreach.
Lightfern's Ultracomplete feature provides AI-powered text suggestions as you type, adapting to any email situation from brief replies to difficult conversations. Users can press Tab to accept suggestions, reducing composition time and writing anxiety.
Lightfern's Inline Composer sees the full email context and can summarize threads or provide feedback on drafts without requiring users to manually copy content, streamlining email management for busy professionals.