Kerna

C tier on AI Email AssistantsScore 6.9 · #7 of 46

Android app: Not listed
Free plan: Yes
Paid plans from: €12/mo
Runs on: Mac, Web, Windows

kerna.io

Summary

Kerna is an AI email assistant that works inside Gmail and Outlook, with a free plan and paid plans from €12/mo. On request, it sorts open messages into categories such as Urgent, Respond, Invoice, Waiting, and Notification; custom categories and industry taxonomies are available. It drafts replies using the full thread history, with controls for intent and tone. Kerna also 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; the pricing page also lists shared Outlook mailboxes. Kerna says it processes content only when a user starts an action, rather than scanning the inbox in the background. It says content is handled in memory and discarded after the request, with personal data redacted before reaching the inference provider. Outlook requires a Microsoft-hosted mailbox; POP or IMAP connections and on-premises Exchange mailboxes are unsupported.

Who it is for

Kerna is aimed at professionals who want help sorting, summarizing, translating, or drafting email. Its team plans may suit organizations seeking shared prompts, billing, and mail workflows.

What is good

Sorts messages into customizable categories
Drafts replies with intent and tone controls
Summarizes threads up to 50 messages
Supports translation in 45 languages

What to know first

Outlook requires a Microsoft-hosted mailbox
POP, IMAP, and on-premises Exchange are unsupported

Verdict

Kerna offers email triage, drafting, summaries, attachment handling, and translation within Gmail and Outlook. Check the Outlook mailbox requirements before choosing it for an Outlook setup.

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: Yeskerna.io

Facts

Product: Kerna is an AI email assistant that works inside Gmail and Outlook.kerna.io · 29 Sept 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 · 29 Sept 2026
Email drafting: Kerna drafts context-aware replies using the full thread history and lets users choose an intent and tone.kerna.io · 29 Sept 2026
Summaries: Kerna creates structured summaries of email threads, with the About page specifying threads of up to 50 messages.kerna.io · 29 Sept 2026
Attachments: Kerna summarizes attachments and extracts selected fields into tables that can be exported to files.kerna.io · 29 Sept 2026
Languages: Kerna offers translation in 45 languages for inbound messages and outbound replies.kerna.io · 29 Sept 2026
Integrations: Kerna integrates with Gmail, Outlook, Calendar, Contacts and Sheets, and the pricing page lists shared mailboxes for Outlook.kerna.io · 29 Sept 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 · 29 Sept 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 · 29 Sept 2026
Security: The trust page reports TLS 1.2 or higher in transit and AES-256 encryption at rest in Firestore.kerna.io · 29 Sept 2026
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 · 29 Sept 2026
Outlook requirements: Outlook requires a Microsoft-hosted mailbox; POP or IMAP connections and on-premises Exchange mailboxes are unsupported.kerna.io · 29 Sept 2026
Intended users: Kerna describes itself as email automation for professionals and offers team plans for collaboration and larger organizations.kerna.io · 29 Sept 2026