Kerna's IntelligencePowered by OpenAI.
Kerna brings GPT-4 & GPT-5 reasoning right into your inbox for 45-language translation and structured workflow automation.
Serious capability, no compromises.
Frontier reasoning, zero data retention, and 45 languages — the foundation under every email Kerna handles, hosted entirely in the EU.
Engineered for the inbox.
The world's most advanced reasoning, brought into the place you already work. No tab-switching, no copy-paste — every capability runs natively in your inbox sidebar.
Read it in your language. Reply in theirs.
Kerna translates the email you received, the reply you're drafting, or a brand-new message — into any of 45 languages, tuned per language and matched to your tone.
Send reply in · tuned per language
A finished draft from a one-line brief.
Choose one of 200 industry-aware templates, add a sentence of intent, and Kerna writes the whole email — structure, tone, and detail handled.
Template · 200 briefs
Say it the way you meant to.
Turn a rushed draft into something that lands — more confident, more concise, warmer, or more formal — and review it before it sends.
Rewrite as · meaning preserved
Read the thread without reading the thread.
Kerna condenses a long conversation into a clear summary — in three levels of detail, from a one-line gist to a thorough recap.
Summary detail · 3 levels
Replies that already know the thread.
Pick an intent and a tone — Kerna reads the prior messages and drafts a reply that stays relevant, polite, and unmistakably yours.
Reply intent · 8 intents + tone
Never re-type a date, contact, or task again.
Kerna pulls the dates, people, and to-dos buried in a message and lets you drop them straight into Calendar, Contacts, and Tasks.
Detect · tap to toggle
Sort your inbox the moment you need to.
Kerna groups your open messages into Urgent, Reply, FYI, and Archive — only when you ask, never scanning in the background.
Triage · on demand
Get the gist of any attachment.
Kerna reads the file in your thread and hands back the key points — no opening, scrolling, or skimming. It runs only when you ask, never in the background.
Summarise · on demand
- Revenue up 18% QoQ, led by EU expansion.
- Two Berlin hires approved for Q4.
- Q4 priorities: onboarding automation, churn reduction.
- Decision needed: renew hosting contract by 15 Jul.
Even more in Outlook.
Everything Kerna does in Gmail comes to Outlook too — plus two tools built for the way Outlook teams work day to day.
Turn attachments into a clean table.
Kerna reads each file in an Outlook thread and pulls the fields you choose into one row per file — then exports the table straight to Excel.
3 attachments
Fields to extract · tap to toggle
Two workflows. One sidebar.
Whether you're answering what just landed or writing the next message from scratch, Kerna handles it right where you already work — no tabs, no copy-paste, no data leaving the EU.
Reply Assistant
Respond to what's in your inbox
Open the email
Click Kerna in the sidebar — it has already read the whole thread.
Pick an action
Summarize, reply, or translate. A draft appears in seconds, matched to the conversation.
Review & send
Tweak a word if you like, then send — in any of 45 languages.
Compose Assistant
Start a new message from scratch
Start composing
Open the compose assistant on a blank email — no template hunting.
Choose a template
Pick from 200 expert briefs — cold outreach, follow-ups, reminders — and add a detail or two.
Review & send
Kerna writes one complete, on-brief draft. Polish it and send.
Ready to upgrade your workflow?
Stop switching tabs. Experience the power of GPT-5 with zero content retention. Join professionals who save 10+ hours a week.