Thunderbird

Pricing
Alternatives

Thunderbird is an open-source mail client with calendar and contacts, available on Windows, Linux, macOS and Android. People who manage several mail accounts use it to read them in one unified inbox, filter and tag messages, and keep contacts and calendars beside their mail.

Facts at a glance

Fact	Value	Source
Company	MZLA Technologies Corporation, San Francisco, California, USA	thunderbird.net/en-US/privacy, checked 10 Nov 2026
Free plan	Free: a free plan exists	thunderbird.net/en-US/about, checked 10 Nov 2026
Platforms	Windows, macOS, Linux, Android	thunderbird.net/en-US/download, checked 10 Nov 2026

Pricing & plans

Model

Free

Free plan available

Price tiers

Plan	Per month	Usage, as the vendor states it
Thunderbird	Free	Free email, calendar and contacts app for Windows, Linux, macOS and Android, funded by donations

Prices are the vendor's list prices in USD. Source: thunderbird.net/en-US, checked 5 Nov 2026.

Free and open-source software released under the MPL 2.0 license
Funded by user donations
The license keeps the software free permanently

Source: thunderbird.net/en-US/about, checked 10 Nov 2026

Features & platforms

Unified inbox across several accounts
Filters to organize messages
Tags to find important mail quickly
Email, calendar and contacts in one app
Customizable look and workflow

Windows
macOS
Linux
Android

Sources: thunderbird.net/en-US, thunderbird.net/en-US/download, checked 5 Nov 2026

Open source and self-hosting

License

MPL-2.0

Repository

github.com/thunderbird/thunderbird-android

Sources: thunderbird.net/en-US/about, github.com/thunderbird/thunderbird-android

Alternatives

Mimestream
A macOS email client built on the Gmail API, with support for Gmail labels, categories and server-side filters.
Mailspring
Runs natively on Mac, Windows and Linux, and includes a unified inbox, undo send, read receipts and custom themes.
Shortwave
Offers Individual and Business plans with AI search over email history, priced per seat.