Kerna vs WriteMail.ai
Kerna
kerna.io
WriteMail.ai
writemail.aiSide by side
| Figure | Kerna | WriteMail.ai |
|---|---|---|
| Price from | €12/mo | $5/mo |
| Free plan | Yes | Yes |
| Free trial | — | — |
| Open source | — | — |
| Web | Yes | Yes |
| Windows | Yes | Yes |
| macOS | Yes | Yes |
| iOS | — | Yes |
| Android | — | Yes |
| API | — | Yes |
| Plans published | 5 | 10 |
| Spec score · AI Email Writing Tools | 8.2 (#11) | 8.6 (#4) |
| Integrations | Kerna integrates with Gmail, Outlook, Calendar, Contacts and Sheets, and the pricing page lists shared mailboxes for Outlook. | Official pricing materials list Chrome and Firefox Gmail extensions, a Google Workspace Gmail add-on, and an Outlook add-in. |
| Intended users | Kerna describes itself as email automation for professionals and offers team plans for collaboration and larger organizations. | The site describes the product as designed for busy people, professionals, teams, executives, and entrepreneurs. |
| Languages | Kerna offers translation in 45 languages for inbound messages and outbound replies. | The site advertises email generation in more than 30 languages. |
| 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 site says generated messages do not touch its servers and personalized options are stored in a browser cookie. |
Plans
Kerna
- StarterFree
- Standard€12 a month
- Pro€22 a month
- Business€69 a month
- Enterprise€499 a month
WriteMail.ai
- FreeFree
- Regular$6.95 a month
- Basic$11.95 a month
- Pro$19.95 a month
- Regular$60 a year
- Regular annual$60 a year
- Basic$103.20 a year
- Basic annual$103.20 a year
- Pro$172.32 a year
- Pro annual$172.32 a year
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.
WriteMail.ai
WriteMail.ai drafts and refines emails from a user's goals or key points, and can also generate replies from a pasted conversation and a reply goal. Users can adjust length, style, tone, mood, emoji use, and language. The site advertises generation in more than 30 languages and lists cold outreach, follow-ups, marketing, customer support, and personal email among its use cases. Browser integrations include a Chrome extension for Gmail, Firefox and Google Workspace Gmail extensions, and an Outlook add-in. The service prepares generated text for the user's default email client rather than sending messages itself. WriteMail.ai says generated messages do not touch its servers and personalized options are stored in a browser cookie. The free plan allows five AI emails per month. Paid monthly plans list 50 emails for Regular at $6.95, 150 for Basic at $11.95, and 500 for Pro at $19.95. The pricing note lists paid access from $5 per month billed annually. The Mail Assistant's real-time suggestions are limited to paid plans. Apps or access are listed for Android, iOS, macOS, Windows, web, and extensions.