Thunderbird AlternativesOnly apps from the EU

The best alternative to Thunderbird is Betterbird, which is both free and Open Source. If that doesn't suit you, our users have ranked more than 50 alternatives to Thunderbird and 19 are so hopefully you can find a suitable replacement. Other interesting alternatives to Thunderbird are SeaMonkey, FairEmail, eM Client and Pelton.

filter to find the best alternatives

Thunderbird alternatives are mainly Email Clients, but if you're looking for Calendar Apps or Contact Managers you can filter on that. Other popular filters include Open Source, Linux, iPhone, Kindle Fire, Windows, Mac and Android. You can also filter by region, for example EU-based alternatives if you prefer software developed in the European Union. These are just examples - use the filter bar below to find more specific alternatives to Thunderbird.
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Alternatives list

  1. Betterbird icon

    Betterbird

     87 likes

    Betterbird, a soft fork of Mozilla Thunderbird, improves user experience with advanced features, bug fixes, security patches, and multi-row descriptions similar to Outlook. Compatible with multiple platforms and can be used alongside Thunderbird, sharing the same profile.

    35 Betterbird alternatives

    Cost / License

    • Free
    • Open Source

    Application type

    Platforms

    • Mac
    • Windows
    • Linux
    • Flathub
    • Chocolatey
    Betterbird screenshot 1
     
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    6
    Betterbird vs Thunderbird Comments
    Top Positive Comment
    Sam Lander
    3

    Betterbird does everything that Thunderbird does (it's a soft fork), while improving bugs and features.

    Because it's a soft fork, it retains the security implementations of Thunderbird.

    Thunderbird actually implements many of the bug fixes created by Betterbird, but at a much slower pace.

    Shoji VR
    Positive
    2

    has more features than thunderbird

    drummer_nrg
    Positive
    1

    Betterbird is actively updated by a previous Thunderbird developer and is a fully compatible fork of Thunderbird which fixes some outstanding bugs. My add-ons like keepassxc-mail work fine!

    3 of 6 comments
    • Betterbird is Free and Open SourceThunderbird is also Free and Open Source
    • Betterbird is LightweightThunderbird is not according to our users
  2. SeaMonkey icon

    SeaMonkey

     249 likes

    Web-browser, advanced e-mail, newsgroup and feed client, IRC chat, and HTML editing in one application. Itis built on the open source Mozilla Gecko engine, the same code which underlies Thunderbird and is the base for the Firefox browser.

    189 SeaMonkey alternatives

    Cost / License

    • Free
    • Open Source

    Application type

    Platforms

    • Mac
    • Windows
    • Linux
    • BSD
    • PortableApps.com
    SeaMonkey screenshot 1
     
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    4
    SeaMonkey vs Thunderbird Comments
    Guest
    Positive
    21

    SeaMonkey is both a WEB BROWSER and EMAIL CLIENT. It's the successor of Mozilla Application Suite or Netscape Communicator, resp. Further it includes also a news client program, an HTML editor (SeaMonkey Composer) and an IRC client (ChatZilla).

    apostolfaliagas
    Positive
    15

    It has all of Thunderbird's features and many more.

    Guest
    Negative
    0

    Unfortunately doesn't support synchronization with CardDAV address books.

    3 of 4 comments
    • SeaMonkey is Free and Open SourceThunderbird is also Free and Open Source
    • SeaMonkey is LightweightThunderbird is not according to our users
  4. FairEmail icon

    FairEmail

     94 likes

    Open-source, privacy-focused email client offering features such as encryption via OpenPGP and S/MIME, unlimited accounts, a unified inbox, customizable settings, and reformatted emails to prevent phishing. Supports two-way synchronization and provides Pro features for additional customization.

    46 FairEmail alternatives

    Cost / License

    Application type

    Platforms

    • Android
    • Android Tablet
    • F-Droid
    Compose message view.
     
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    2
    FairEmail vs Thunderbird Comments
    ByteRanger
    Negative
    -2

    While I do use FairEmail on my mobile devices and like it, it is not a valid alternative to Thunderbird which is for desktop platforms.

    Guest
    Negative
    -9

    wrong platform. FairEmail is not an alternative for Thunderbird users because it only runs on android. Thunderbird is for desktop operating systems only.

    • FairEmail is Freemium and Open SourceThunderbird is Free and Open Source
    • FairEmail is LightweightThunderbird is not according to our users
  5. eM Client icon

    eM Client

     236 likes

    Looking for a full-featured email client with a modern and easy-to-use interface? Look no further than eM Client. Rated 3 out of 5, eM Client is a popular alternative to Thunderbird, offering all the features you need to manage your email, calendar, tasks, contacts, notes, and chat all in one place.

    With support for IMAP, calendar integration, and multiple accounts, eM Client is the perfect choice for users who want a robust email client that can handle all their needs. Whether you're using Windows or Mac, eM Client is the most popular proprietary alternative to Thunderbird, offering a powerful and flexible solution for managing your email and staying organized. Give it a try today and see why so many users are making the switch to eM Client.

    66 eM Client alternatives

    Cost / License

    • Freemium
    • Proprietary

    Application types

    Platforms

    • Mac
    • Windows
    • Android
    eM Client: Inbox view
     
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    13
    eM Client vs Thunderbird Comments
    Top Positive Comment
    3psilon
    2

    A good Windows alternative if you use 1-2 mailboxes or don't mind paying.

    Top Negative Comment
    LinuxDoge
    3

    doesnt support Linux, isnt open source, not configurable enough

    Shoji VR
    Negative
    1

    its freemium and no linux support

    3 of 13 comments
    • eM Client is Freemium and ProprietaryThunderbird is Free and Open Source
  7. Pelton icon

    Pelton

     11 likes

    Free, open-source client for Windows, macOS, and Linux, offering local email storage and search online or offline, privacy-focused with no telemetry or third-party servers, IMAP and SMTP support, intuitive interface, and multiple account support.

    18 Pelton alternatives

    Cost / License

    Application type

    Platforms

    • Mac
    • Windows
    • Linux
    Pelton screenshot 1
     
  8. KMail icon

    KMail

     49 likes

    KMail is the email component of Kontact, the integrated personal information manager of KDE. Kontact is a personal information manager and groupware software suite for KDE. It supports calendars, contacts, notes, to-do lists, news, and email.

    54 KMail alternatives

    Cost / License

    • Free
    • Open Source

    Application type

    Platforms

    • Linux
    • BSD
    KMail screenshot 1
     
  9. Airmail icon

    Airmail

     74 likes

    Engineered for iOS, macOS, and watchOS, this fast mail client supports multiple account types, custom actions, Smart Inbox filtering, unified inbox, privacy mode, email scheduling, snooze, third-party app integration, flexible personalization, and advanced workflow tools.

    69 Airmail alternatives

    Cost / License

    • Paid
    • Proprietary

    Application type

    Platforms

    • Mac
    • iPhone
    • iPad
    • Apple Watch
    Airmail screenshot 1
     
  10. Trojitá icon

    Trojitá

     17 likes

    Trojitá, is a fast Qt IMAP e-mail client that respects open standards and facilitates modern technologies. Trojitá values vendor-neutrality that IMAP provides and is committed to be as interoperable as possible.

    Cost / License

    • Free
    • Open Source

    Application type

    Alerts

    • Discontinued

    Platforms

    • Windows
    • Linux
    Home
     
  11. Nextcloud Mail icon

    Nextcloud Mail

     14 likes

    💌 Mail app for Nextcloud.

    Cost / License

    Application type

    Platforms

    • Online
    • Self-Hosted
    • Nextcloud
     
  12. Prudii icon

    Prudii

     2 likes

    Prudii is a private, tracker-blocking desktop email client for Windows, macOS and Linux. All mail stays on your machine — no cloud, no telemetry.

    15 Prudii alternatives

    Cost / License

    • Free
    • Proprietary

    Application type

    Platforms

    • Mac
    • Windows
    • Linux
    Prudii screenshot 1
     
  14. Mynigma icon

    Mynigma

     2 likes

    Mynigma is a new kind of email client with built-in encryption.

    Cost / License

    • Free Personal
    • Proprietary

    Application type

    Alerts

    • Discontinued

    Platforms

    • Mac
    • iPhone
    • iPad
    Mynigma screenshot 1
     
12 of 19 Thunderbird alternatives