Your mail, calendar and contacts in one fast, private app, on Windows, Linux and Android.
Carteiro is an email and calendar client with the familiar Outlook layout: folders on the left, conversations in the middle, the message on the right. On a phone it becomes one tidy pane at a time with a bottom bar. It works with any mail provider, keeps working offline, and is built to keep trackers, phishing and malware out of your inbox.
- Every account in one place. Gmail, Outlook / Microsoft 365, and any IMAP or POP3 provider, with a unified inbox.
- Mail, calendar and contacts together. Google, Microsoft and CalDAV/CardDAV calendars and address books stay in sync; public holidays for 200+ countries are one click away.
- Private by default. Remote images and trackers are blocked, tracking parameters are stripped from links, and no script in an email ever runs.
- Protected from malware and phishing. A built-in ClamAV engine scans every message and attachment; disguised files and lying links are flagged before you click.
- Works offline. Read the last day, month, year or everything without a connection; sending and changes wait in the Outbox until you're back.
- Yours to keep. Export mail as
.mbox, contacts as vCard, and back everything up into one encrypted file you can restore on any device. - Light and fast. A native Rust core with small installers, light and dark themes, and automatic, signed updates.
| Calendar | Contacts |
|---|---|
 |
 |
Phishing caught, in dark mode. The link that pretends to be the bank and the disguised .exe are flagged, and the attachment can't be saved.
On Android: inbox, a conversation, the agenda, and the contacts letter jump.
Download the latest release from the Releases page:
- Windows: the
.msiinstaller. - Linux: the
.AppImage; make it executable and run it. - Android (9 or newer): the
.apk; allow installing from your browser or file manager when Android asks.
Every release is checked by VirusTotal before it's published, and SHA256SUMS lists the checksums of all files.
- User guide: accounts, mail, calendar, contacts, backups and settings.
- Security: how Carteiro protects you, and how that was tested.
- Development: building, testing, sign-in app registrations and releases.
Carteiro is free software under the GPL-3.0-or-later license.