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Kerna

kerna.io

From €12/mo Free plan WebWindowsmacOS
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Spec score 8.3 #11 of 46 in AI Email Assistants

What it is

Kerna is an AI email assistant for Gmail and Outlook on macOS, Windows, and the web. At a user’s request, it sorts open messages into categories such as Urgent, Respond, Invoice, Waiting, and Notification; users can also set custom categories and industry taxonomies. It drafts replies based on the full thread, with controls for intent and tone, and makes structured thread summaries for conversations of up to 50 messages. It can summarize attachments, extract selected fields into exportable tables, and translate inbound messages and outbound replies in 45 languages. Integrations include Calendar, Contacts, and Sheets as well as Gmail and Outlook. Kerna says it acts only when a user initiates a request, processes content in memory, discards it afterward, and redacts personal data before it reaches the inference provider. Its trust information reports TLS 1.2 or higher in transit and AES-256 encryption at rest. Kerna has a free plan; paid plans start at €12/mo. Outlook requires a Microsoft-hosted mailbox; POP or IMAP and on-premises Exchange are unsupported.

Spec sheet

Product
Kerna is an AI email assistant that works inside Gmail and Outlook.Read 29 Sep 2026 · kerna.io
Intended users
Kerna describes itself as email automation for professionals and offers team plans for collaboration and larger organizations.Read 29 Sep 2026 · kerna.io
Integrations
Kerna integrates with Gmail, Outlook, Calendar, Contacts and Sheets, and the pricing page lists shared mailboxes for Outlook.Read 29 Sep 2026 · kerna.io
Security
The trust page reports TLS 1.2 or higher in transit and AES-256 encryption at rest in Firestore.Read 29 Sep 2026 · kerna.io
Privacy
Kerna says email content is processed in memory and discarded after the request, with personal data redacted before content reaches the inference provider.Read 29 Sep 2026 · kerna.io
Headquarters
Katowice, PolandRead 28 Sep 2026 · kerna.io
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.Read 29 Sep 2026 · kerna.io
Attachments
Kerna summarizes attachments and extracts selected fields into tables that can be exported to files.Read 29 Sep 2026 · kerna.io
Email drafting
Kerna drafts context-aware replies using the full thread history and lets users choose an intent and tone.Read 29 Sep 2026 · kerna.io
Inbox triage
On request, Kerna sorts open messages into Urgent, Respond, Invoice, Waiting and Notification, with custom categories and industry taxonomies available.Read 29 Sep 2026 · kerna.io
Languages
Kerna offers translation in 45 languages for inbound messages and outbound replies.Read 29 Sep 2026 · kerna.io
Outlook requirements
Outlook requires a Microsoft-hosted mailbox; POP or IMAP connections and on-premises Exchange mailboxes are unsupported.Read 29 Sep 2026 · kerna.io
Summaries
Kerna creates structured summaries of email threads, with the About page specifying threads of up to 50 messages.Read 29 Sep 2026 · kerna.io
User control
Kerna says it only processes content when a user initiates an action and does not scan the inbox in the background.Read 29 Sep 2026 · kerna.io

Plans and prices

Starter Free 30,000 Tokens (Trial Volume) · GPT-5.6 · All features · Single User License Read 29 Sep 2026 · kerna.io
Standard €12 a month Monthly 500,000 Tokens (Standard Usage) · GPT-5.6 · All features · Single User Only Read 29 Sep 2026 · kerna.io
Pro €22 a month Monthly 1,000,000 Tokens (Power Usage) · GPT-5.6 · All features · Single User Only Read 29 Sep 2026 · kerna.io
Business €69 a month Monthly 7,500,000 Tokens (Shared Pool) · Includes 5 Team Seats · Shared Prompts & Billing · No Wasted Credits Read 29 Sep 2026 · kerna.io
Enterprise €499 a month Monthly 50,000,000 Tokens (Shared Pool) · Includes 25 Team Seats · Processing Log + CSV Export · Priority Contact Read 29 Sep 2026 · kerna.io

Every Kerna plan and price →

Strong points and limits

Strong points

  • Sorts messages into built-in or custom categories on request.
  • Drafts replies using full thread history and tone controls.
  • Summarizes threads up to 50 messages.
  • Translates inbound and outbound email in 45 languages.
  • Processes content only after a user action, according to Kerna.

Limits

  • Outlook requires a Microsoft-hosted mailbox.
  • POP, IMAP, and on-premises Exchange are unsupported.
  • Standard and Pro plans are single-user only.
  • Paid plans start at €12/mo.

Who it suits

Kerna suits professionals who want help sorting, drafting, summarizing, or translating email within Gmail or Outlook. Team plans are available for collaboration and larger organizations.

Verdict

Kerna combines email triage, drafting, summaries, attachment extraction, and translation in Gmail and Outlook. Check the Outlook mailbox requirement and whether a single-user or team plan fits your use.

Where Specifiction places it

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