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Kerna
Katowice, Poland
What it is
Kerna is an AI email assistant for Gmail and Outlook, available on the web, macOS, and Windows. Users can ask it to sort open messages into categories such as Urgent, Respond, Invoice, Waiting, and Notification, or use custom categories and industry taxonomies. It drafts replies from the full thread history, with controls for intent and tone, and creates structured thread summaries for messages of up to 50 emails. Kerna can also summarize attachments and extract chosen fields into tables for export. Translation is available for incoming messages and outgoing replies in 45 languages. Integrations include Gmail, Outlook, Calendar, Contacts, and Sheets; shared Outlook mailboxes are listed for paid plans. Kerna says it processes content only after a user action, discards it after the request, and redacts personal data before it reaches the inference provider. The free plan includes 30,000 tokens; paid plans start at €12/mo. Outlook use requires a Microsoft-hosted mailbox; POP or IMAP and on-premises Exchange are unsupported.
For and against
For
- Drafts replies using full thread history.
- Summarizes threads of up to 50 messages.
- Translates messages and replies in 45 languages.
- Processes email only after a user action.
- Includes Calendar, Contacts, and Sheets integrations.
Against
- Outlook requires a Microsoft-hosted mailbox.
- POP, IMAP, and on-premises Exchange are unsupported.
- Paid plans start at €12/mo.
The verdict
Kerna combines email triage, drafting, summaries, attachment extraction, and translation in Gmail and Outlook. Its mailbox requirements and per-plan token limits are worth considering before choosing a plan.
Who it suits
Kerna suits professionals who want help organizing and drafting email, with team plans available for collaboration and larger organizations. Outlook users need a Microsoft-hosted mailbox.
Plans and prices
Starter
30,000 Tokens (Trial Volume) · GPT-5.6 · All features · Single User License
Read 29 Sep 2026 · kerna.io
Standard
500,000 Tokens (Standard Usage) · GPT-5.6 · All features · Single User Only
Read 29 Sep 2026 · kerna.io
Pro
1,000,000 Tokens (Power Usage) · GPT-5.6 · All features · Single User Only
Read 29 Sep 2026 · kerna.io
Business
7,500,000 Tokens (Shared Pool) · Includes 5 Team Seats · Shared Prompts & Billing · No Wasted Credits
Read 29 Sep 2026 · kerna.io
Enterprise
50,000,000 Tokens (Shared Pool) · Includes 25 Team Seats · Processing Log + CSV Export · Priority Contact
Read 29 Sep 2026 · kerna.io
On the record
- Assurance
- Kerna reports CASA Tier 2 validation for its Gmail add-on and describes Microsoft Publisher Attestation as a self-assessment, not an independent verification or Microsoft 365 Certification.kerna.io · read 29 Sep 2026
- Attachments
- Kerna summarizes attachments and extracts selected fields into tables that can be exported to files.kerna.io · read 29 Sep 2026
- Email drafting
- Kerna drafts context-aware replies using the full thread history and lets users choose an intent and tone.kerna.io · read 29 Sep 2026
- Inbox triage
- On request, Kerna sorts open messages into Urgent, Respond, Invoice, Waiting and Notification, with custom categories and industry taxonomies available.kerna.io · read 29 Sep 2026
- Integrations
- Kerna integrates with Gmail, Outlook, Calendar, Contacts and Sheets, and the pricing page lists shared mailboxes for Outlook.kerna.io · read 29 Sep 2026
- Intended users
- Kerna describes itself as email automation for professionals and offers team plans for collaboration and larger organizations.kerna.io · read 29 Sep 2026
- Languages
- Kerna offers translation in 45 languages for inbound messages and outbound replies.kerna.io · read 29 Sep 2026
- Outlook requirements
- Outlook requires a Microsoft-hosted mailbox; POP or IMAP connections and on-premises Exchange mailboxes are unsupported.kerna.io · read 29 Sep 2026
- Privacy
- Kerna says email content is processed in memory and discarded after the request, with personal data redacted before content reaches the inference provider.kerna.io · read 29 Sep 2026
- Product
- Kerna is an AI email assistant that works inside Gmail and Outlook.kerna.io · read 29 Sep 2026
- Security
- The trust page reports TLS 1.2 or higher in transit and AES-256 encryption at rest in Firestore.kerna.io · read 29 Sep 2026
- Summaries
- Kerna creates structured summaries of email threads, with the About page specifying threads of up to 50 messages.kerna.io · read 29 Sep 2026
- User control
- Kerna says it only processes content when a user initiates an action and does not scan the inbox in the background.kerna.io · read 29 Sep 2026
