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MailU

Gmail, with a mind of its own.

MailU is an AI-powered workspace for your Gmail. An assistant that searches, organizes, files attachments, and drafts replies — with real-time sync, keyboard-first speed, and nothing ever leaving your Google account.

See it in action
Free · Google OAuth sign-in · Your mail never leaves Gmail

Preview of the MailU inbox: the sidebar with the gradient Compose button, folders and labels, Gmail-style category tabs, the message list, and the MailU Assistant organizing promotions on request.

Works with the Google tools you already use

GmailGoogle DriveGoogle ContactsGemini

AI Assistant

An assistant with hands, not just answers.

Powered by Gemini, the MailU assistant doesn't just summarize — it acts. It searches your mail, applies labels, files attachments to Drive, blocks senders, sets your vacation responder, and drafts replies. Sending always waits for your confirmation.

  • searchEmails
  • bulkOrganize
  • saveAttachmentToDrive
  • setVacationResponder
  • createMailFilter
  • blockSender
MailU Assistant
Connected to your inbox
Hi! I can compose emails, search your inbox, apply filters, and navigate views for you.
Summarize my unreadFind invoices from last monthLabel newsletters
0+

actions the assistant can take

<0s

for new mail to appear

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stays inside your Gmail

Features

Everything a serious inbox needs.

The speed of a power tool, the calm of a clean desk.

Real-time sync

New mail appears the moment it lands. Gmail push notifications stream over Pub/Sub straight to your browser — with polling as a safety net when the connection drops.

Keyboard-first

Go, compose, search, and explore a full shortcut map — your hands never leave the keys.

Search like a power user

Full Gmail query syntax, plus saved filters and labels — everywhere, including the assistant.

Rich compose & scheduled send

A real editor with formatting, recipient chips, and contact autocomplete. Write now, send at nine tomorrow — MailU delivers it on schedule.

Attachments that talk

MailU reads PDFs, Word docs, and spreadsheets so the assistant can answer from them — and files them to Drive on request.

Fast at any size

Virtualized lists and threaded conversations keep a packed inbox as quick as an empty one.

Security & Privacy

Your mail stays yours.

MailU talks directly to the Gmail API on your behalf. Your password never touches our servers, and your mail never leaves Google.

Google OAuth only

Sign in with Google. No passwords created, no passwords stored — revoke access anytime from your Google account.

Sandboxed email rendering

Every message renders inside an isolated Shadow DOM and is sanitized with DOMPurify before a single pixel paints.

The AI asks first

The assistant drafts and organizes on its own, but sending an email always requires your explicit confirmation.

Hardened by default

Rate-limited APIs and strict redirect validation on every sign-in. Your mail lives in Gmail — MailU is a window onto it.

FAQ

Questions, answered.

Is MailU free?
Yes. MailU is a personal project — sign in with your Google account and use it.
Does my email leave Gmail?
No. MailU reads and writes through the official Gmail API. Your messages live in Gmail; MailU is a smarter window onto them.
Will the AI ever send something without me?
No. The assistant can search, label, and draft on its own, but sending always requires a confirmation from you.
What Google permissions does MailU need?
Gmail access to read, organize, and send your mail, and Drive access to save attachments when you ask. You can revoke access anytime at myaccount.google.com/permissions.
Does it support dark mode and keyboard shortcuts?
Both. Light, dark, or follow-your-system, and a full keyboard map — press ? inside the app to see it.
How is my data protected?
Sign-in is Google OAuth only, every message renders sandboxed and sanitized, and the APIs are rate-limited. The full details are in the privacy policy.

Your inbox, upgraded.

One sign-in and the assistant, real-time sync, and keyboard-first speed are yours.

Works with any Gmail account.