Skip to the content

Thunderbird

Mail, calendar and contacts for all your accounts in one app.

Privacy
Mail & messaging
Free
Added 29 October 2026
Open source, instead of Microsoft Outlook

Visit thunderbird.net Compare with another

Alternatives to Thunderbird

All of Mail & messaging

ProtonMail & messagingFreemiumEncrypted mail, calendar, drive, VPN and passwords from one Swiss company.
Jitsi MeetMail & messagingFreeVideo calls straight from a link, with no account needed.
ElementMail & messagingFreeTeam chat on the open Matrix network, encrypted end to end.
MattermostMail & messagingFreeChannels and threads like Slack, on a server you run.
SignalMail & messagingFreeEnd-to-end encrypted messages and calls, run by a non-profit.
Silent CircleMail & messagingPaidEncrypted calls and messaging for businesses and organisations.
NextcloudStorageFreemiumThe popular open-source, self-hosted cloud for files, calendar and chat.
KeePassXCSecurityFreePasswords in an encrypted file you keep, with no account at all.

Thunderbird, side by side

In search, type /like thunderbird or /vs thunderbird … to get here from anywhere.

Know a tool that belongs on a shelf?

Send it in and tell us what you use it for. If it earns a shelf, you’ll hear back with the line we wrote for it.

Submit tool