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No. 8 of 46 ·AI Email Assistants

Kerna

Web · Windows · Mac · paid plans from €12/mo

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Freedom report

Three barsScore 6.4

  • Free tierA free tier is on its own pricing page
  • Open codeNo open-source code on record
  • Runs widely3 of 6 device platforms
  • DocumentedPlans, terms and facts published

Kerna is an AI email assistant that works inside Gmail and Outlook, with a free Starter plan and paid plans from €12/mo. When asked, 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 using the full email thread, with controls for intent and tone. Kerna creates structured summaries of threads up to 50 messages, summarizes attachments, and extracts selected fields into tables that can be exported. Translation covers inbound messages and outbound replies in 45 languages. Integrations include Gmail, Outlook, Calendar, Contacts, and Sheets; shared Outlook mailboxes are listed on the pricing page. Kerna says it processes content only when a user initiates an action, rather than scanning inboxes in the background. It says email content is processed in memory and discarded after the request, with personal data redacted before it reaches the inference provider. Its trust information reports TLS 1.2 or higher in transit and AES-256 encryption at rest in Firestore. Outlook requires a Microsoft-hosted mailbox; POP or IMAP connections and on-premises Exchange mailboxes are unsupported.

Who it is for

It suits professionals who want email drafting, triage, summaries, or translation within Gmail or Outlook. Outlook users need a Microsoft-hosted mailbox; POP, IMAP, and on-premises Exchange are unsupported.

What is good

  • Sorts open messages into built-in or custom categories.
  • Drafts replies with intent and tone controls.
  • Summarizes threads up to 50 messages.
  • Translates messages and replies in 45 languages.
  • Processes content only after a user action.

What to know first

  • Outlook requires a Microsoft-hosted mailbox.
  • POP and IMAP connections are unsupported.
  • On-premises Exchange mailboxes are unsupported.
  • Starter provides 30,000 tokens as trial volume.

Verdict

Kerna brings triage, drafting, summaries, and translation into Gmail and Outlook, with user-triggered processing. Its Outlook mailbox requirements and token volumes are important to consider before choosing a plan.

Kerna plans and pricing

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

Compared on AI email assistants

Free plan
Yes

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