Press

MailTwin press kit

Everything you need to cover MailTwin. Questions, review licenses, interviews: [email protected] — we reply within a day.

Fast facts

What: MailTwin — a native macOS menubar app that drafts Apple Mail replies in the user's own writing voice, using the AI provider the user chooses.
Who: Built by Christopher Naas, indie developer, through Smilodon AS (Norway).
Price: $19.90 one-time (single Mac user) · $49.90 five-pack · lifetime 1.x updates · 30-day full trial, no card required. No subscription.
Platform: macOS 13 or later. Native Swift. Works with Apple Mail — including iCloud, Gmail, Exchange, and IMAP accounts configured in Mail.
AI providers (bring your own key): Claude, OpenAI, Gemini, Groq, Grok, DeepSeek — plus two that need no key at all: Apple Intelligence (on-device, macOS 26+) and Ollama (local).
Languages: 15 at launch — English, Norwegian, German, French, Spanish, Japanese, Simplified Chinese, Russian, Brazilian Portuguese, Arabic, Italian, Dutch, Korean, Polish, Hindi.
Availability: Direct download at mailtwin.ai, signed and notarized, with automatic updates.

Boilerplate

MailTwin is a Mac menubar app that gives Apple Mail an AI twin of the user's own writing voice. It learns from sent mail — locally, per account, only when asked — so work replies and personal replies each sound right. Users bring their own AI: Apple Intelligence and Ollama run free on-device, or plug in a Claude, OpenAI, Gemini, Groq, Grok, or DeepSeek key. No MailTwin server ever touches mail content. MailTwin costs $19.90 once, with a 30-day full trial, and ships in 15 languages. It is built in Norway by Christopher Naas.

What makes it different

Keywords, right inside Mail. Type a few rough points into Mail's own reply window — "can't Friday, propose Tuesday, ask about invoice" — press Expand, and they become the finished reply in place, above the quote, signature untouched. If the AI invents a number, a date, or a sign-off, nothing is written and the typed keywords stay exactly as they were.
Nothing to learn. New Macs start in a reduced panel that is a text box and the Return key; the rest of the app appears when the user asks for it. Setup shows the result first, then walks through a free Groq key in about three minutes — or starts instantly on-device with Apple Intelligence.
Write the answer, not the email. Select a message, type a few rough reply points — "can't Friday, propose Tuesday, ask about invoice" — and MailTwin drafts a complete, editable reply in the learned voice for that account. The user reviews it before insertion; MailTwin never auto-sends.
One voice per account. Style is learned separately for every mail account, so the work voice and the personal voice each speak in their own register. Switching mailbox switches voice. Indexing is explicit-only and stays on the Mac.
No server in the middle. Mail content goes directly from the user's Mac to their chosen AI provider — or never leaves the Mac at all with Apple Intelligence or Ollama. There is no MailTwin cloud for mail, by design.
AI that can't corrupt a draft. Every rewrite passes an on-device validator: changed numbers, dates, links, invented subjects, or fake sign-offs are rejected and the draft stays untouched.
Nothing happens silently. Follow-up checks run only when the user asks. Inbox Cleanup presents its full plan before touching anything and leaves an undo receipt.

Founder quote

"I type the rough points I want to cover, and MailTwin authors the complete reply in my voice. On busy email days, that saves me an hour or more." — Christopher Naas, founder. Personal experience; results vary by inbox and workflow.

Assets

App icon: 512×512 PNG · 1024×1024 PNG
Product screenshots: being recaptured for build 91. The previous pair showed a “14d trial” badge from an older build — the trial is 30 days — so they have been withdrawn rather than left where they could be published as current. Ask and you will get the new ones the day they exist.
Additional screenshots, a 90-second demo video, and work-voice vs. personal-voice comparison shots are available on request — as are review licenses for hands-on coverage.

The story in one paragraph

AI email tools generally ask users to adopt a new email client, pay a monthly subscription, and route their correspondence through the vendor's cloud. MailTwin takes the opposite bet: keep Apple Mail, pay once, and keep mail off middleman servers entirely. A solo Norwegian developer spent a year on the hard part — Apple's MailKit gives extensions no way to edit a draft, so MailTwin builds a fail-closed Accessibility bridge to work inside Mail's own compose window — to make "email that sounds like you" work in the mail app Mac users already live in.

Contact

[email protected] — press, review licenses, interviews, fact-checking. Founder is available for written Q&A, calls, and podcasts (English or Norwegian).