Kerna vs Metis Mail
Kerna
kerna.ioMetis Mail
trymetis.emailSide by side
| Figure | Kerna | Metis Mail |
|---|---|---|
| Price from | €12/mo | $9.58/mo |
| Free plan | Yes | Yes |
| Free trial | — | — |
| Open source | — | Yes |
| Web | Yes | Yes |
| Windows | Yes | — |
| macOS | Yes | — |
| API | — | Yes |
| Self-hosted | — | Yes |
| Plans published | 5 | 8 |
| Spec score · AI Email Assistants | 8.3 (#11) | 8.8 (#5) |
| Headquarters | Katowice, Poland | Akola, Maharashtra, India |
| Privacy | Kerna says email content is processed in memory and discarded after the request, with personal data redacted before content reaches the inference provider. | The maker says mail remains with the email provider and is not copied or mirrored to Metis servers; mailbox access is revoked when disconnected. |
| Product | Kerna is an AI email assistant that works inside Gmail and Outlook. | Metis Mail is an open-source email client with an AI agent for Gmail, Microsoft Outlook/Microsoft 365, and Zoho Mail. |
| Security | The trust page reports TLS 1.2 or higher in transit and AES-256 encryption at rest in Firestore. | The service requires TOTP two-factor authentication before a mailbox is reachable, supports password or magic-link sign-in, and enforces per-workspace data isolation. |
Plans
Kerna
- StarterFree
- Standard€12 a month
- Pro€22 a month
- Business€69 a month
- Enterprise€499 a month
Metis Mail
- Open sourceFree
- Cloud Pro$12 a month
- Workspace$20 a month
- Cloud Pro (annual)$115 a year
- Cloud Pro annual$115 a year
- Workspace (annual)$192 a year
- Workspace annual$192 a year
- EnterprisePriced on request
In their own words
Kerna
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.
Metis Mail
Metis Mail has no write-up on Specifiction yet; its figures are above.