Kerna vs OpenReply
Kerna
kerna.io
OpenReply
openreply.aiSide by side
| Figure | Kerna | OpenReply |
|---|---|---|
| Price from | €12/mo | Free |
| Free plan | Yes | Yes |
| Free trial | — | — |
| Open source | — | — |
| Web | Yes | — |
| Windows | Yes | — |
| macOS | Yes | — |
| Plans published | 5 | 1 |
| Spec score · AI Email Writing Tools | 8.2 (#11) | 7.4 (#24) |
| Integrations | Kerna integrates with Gmail, Outlook, Calendar, Contacts and Sheets, and the pricing page lists shared mailboxes for Outlook. | The service integrates with Gmail and third-party AI model providers; Stripe handles payment processing. |
| Security | The trust page reports TLS 1.2 or higher in transit and AES-256 encryption at rest in Firestore. | The maker says browser-to-server data is encrypted with TLS 1.3 and identifies Fly.io hosting, PostgreSQL, JWT authentication, bcrypt password hashing, and Stripe payments. |
Plans
Kerna
- StarterFree
- Standard€12 a month
- Pro€22 a month
- Business€69 a month
- Enterprise€499 a month
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.