GPT for Gmail vs Kerna

GPT for Gmail drafts replies, writes new messages, and summarizes email threads inside Gmail. It reads the full thread to create a contextual reply that can be inserted with one click. Listed tools include email search, response generation, cold emails, templates, subject lines, inbox organization, scheduling, and follow-ups. Users can choose a tone, and the product says translation is supported in more than 30 languages. It is available through the Google Workspace Marketplace, with a Chrome extension for GPT Workspace and integrations with Docs, Sheets, Slides, and Drive. Gmail reply suggestions and drafts work on iOS and Android. The maker says emails are anonymized before processing, not shared or commercially used, and not used to train AI models. The Free plan is free with no feature restrictions. Unlimited Premium costs $9 a month, billed annually, adding higher usage limits and priority support. There is no free trial.

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.