Lightfern
AI email drafting and communication · Workplace tools
How they use Nebius AI Cloud
Lightfern uses Nebius as an inference provider for its AI email tools. Its security page lists Nebius alongside OpenAI and Fireworks AI. Lightfern says it has zero data retention agreements with all its inference providers, including Nebius.
In an August 2026 interview, Matthew Lee describes serving real-time autocomplete suggestions that keep up with each keystroke. Lightfern also drafts replies using email-thread context. Its security page says suggestion requests include the email being composed, its thread, a small number of past emails to match writing style, and relevant calendar information.
In Nebius’s June 2026 Inflection customer montage, a Lightfern speaker says Nebius became important for scaling its AI safely.
Sources
2 sourcesNebius Lightfern · email autocomplete interview
19 Aug 2026 · Nebius · Video
At 0:54–1:21, Matthew Lee describes autocomplete latency requirements and says Lightfern began using Nebius. The spoken latency comparisons are internally inconsistent, so the profile omits those numerical claims.
Open original source at 0:54Company context
lightfern.comLightfern develops an AI writing assistant for people who handle frequent email communication. Its browser extension works inside Gmail, Outlook Web and Superhuman Web. Ultracomplete suggests sentence completions using the current thread, previous conversations and the user's writing style. Inline Composer drafts replies, edits wording, adjusts tone and answers questions about email threads. Users can also add information from open browser tabs as context. The service is designed to help professionals compose messages in their own voice without switching applications.