Thunderbird AlternativesOnly apps categorised as Group Chat Apps

The best Group Chat alternative to Thunderbird is Mailspring, which is both free and Open Source. If that doesn't suit you, our users have ranked more than 50 alternatives to Thunderbird and four of them are Group Chat Apps so hopefully you can find a suitable replacement. Other interesting Group Chat App alternatives to Thunderbird are Spike, Missive and Unibox.

filter to find the best alternatives

Thunderbird alternatives are mainly Email Clients, but if you're looking for Group Chat Apps or Team Collaboration Tools you can filter on that. Other popular filters include Windows + Open Source. 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.
Thunderbird iconThunderbird
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  • ...

Cross-platform email client providing POP/IMAP support, robust filtering, multiple accounts, and chat. Extendable via add-ons with RSS/Atom, etc.

More about Thunderbird
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Thunderbird alternatives page was last updated May 16, 2025
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  1. Mailspring icon

    Mailspring

     107 likes
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    Boost your productivity and send better email with Mailspring, a beautiful, fast email client for Mac, Windows, and Linux. Mailspring is free to use and an optional pro version adds read receipts, send later, reminders and more.

    42 Mailspring alternatives

    License model

    • Freemium • Open Source

    Application types

    Country of Origin

    • US flagUnited States

    Platforms

    • Mac
    • Windows
    • Linux
    • Arch Linux
    • Fedora
    • Ubuntu
    Clean design with integrated search and swipe gestures

    Properties

    1.  Customizable
    2.  User friendly
    3.  Support for Themes

    Features

    1.  Unified inbox
    2.  Multiple Account support
    3.  Dark Mode
    4.  Email tracking
    5.  Snooze Mail
    6.  Ad-free
    7.  Built-in translation
    8.  Theme Customization
    9.  IMAP Support
    10.  Extensible by Plugins/Extensions
    11.  Email Organizer
    12.  Keyboard Shortcuts

    Mailspring VS Thunderbird

     
    Comments about Mailspring as an Alternative to Thunderbird
    Top Positive Comment
    3psilon
    May 2, 2018
    1

    Great alternative, especially for casual users. Simple, streamlined UI, feels fresh.

    Top Negative Comment
    Guest
    Sep 28, 2018
    60

    Need to create an account on a third-party company to access your email.

    Most Recent Comment
    Matt Schaefer
    Negative Jul 15, 2022
    0

    Unable to even find an address book or ability to import a csv file from previous mail client. You lose me when things are made so "modern-clean" that I have to consult a manual or Google things.

    Show more comments
    3 of 7 comments
    Thunderbird Icon
    Mailspring icon

    • Most users think Mailspring is a great Thunderbird alternative.

    • Mailspring is Freemium and Open SourceThunderbird is Free and Open Source
    • Mailspring is CustomizableThunderbird is not according to our users
  2. Spike icon

    Spike

     34 likes
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    Transform your email inbox into a collaborative workspace with Spike. Enjoy integrated chat-like emails, tasks, collaborative notes, and group projects. Seamlessly manage multiple accounts, organize priorities, and schedule meetings across devices.

    63 Spike alternatives

    License model

    • Freemium • Proprietary

    Application types

    Country of Origin

    • IL flagIsrael

    Platforms

    • Mac
    • Windows
    • Online
    • Android
    • iPhone
    • Chrome OS
    • Android Tablet
    • iPad
    • Software as a Service (SaaS)
    • Meta Quest
    One powerful space for all your work needs—get email, chat, notes, tasks, calendar and audio/video calls all from your inbox

    Top Spike Features

    1.  Unified inbox
    2.  Dark Mode
    3.  Email Organizer
    4.  Cloud Sync
    5.  Multiple Account support
    6.  Reminders
    7.  Real time collaboration
    8.  Live Preview
    9.  Built-in File Manager
    10.  Send later
    11.  Read confirmation
    12.  Snooze reliability

    Spike VS Thunderbird

     
    Comments about Spike as an Alternative to Thunderbird
    Guest
    Positive Aug 8, 2020
    1

    Native onlye for Android, iOS, Windows and Mac, not a Linux app

    Thunderbird Icon
    Spike icon

    • Spike is the most popular SaaS alternative to Thunderbird.

    • Spike is Freemium and ProprietaryThunderbird is Free and Open Source
  4. Missive icon

    Missive

     16 likes
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    Collaborative email and threaded group chat for productive teams. A single app for all your internal and external communication.

    License model

    Application types

    Country of Origin

    • CA flagCanada

    Platforms

    • Mac
    • Windows
    • Online
    • Android
    • iPhone
    The perfect shared inbox!

    Missive Features

    1.  Unified inbox
    2.  Shared inbox
    3.  Threaded Conversations
    4.  Email Scheduling
    5.  Multiple Account support
    6.  Customer service
    7.  Email automation
    8.  Integrated Web Browser
    9.  Snooze Mail

    Missive VS Thunderbird

     
  5. Unibox icon

    Unibox

     18 likes
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    Unibox is a people centric email client that organizes your messages by person. It avoids having email like a to-do list.

    25 Unibox alternatives

    License model

    Application types

    Country of Origin

    • DE flagGermany
    • European Union flagEU

    Platforms

    • Mac
    Messages viewer.

    Unibox Features

    1.  Ad-free
    2.  Unified inbox
    3.  Email Organizer
    4.  Multiple Account support
    5.  Full-Text Search
    6.  Conversational email approach
    7.  IMAP Support
    8.  Inbox Management

    Unibox VS Thunderbird

     
4 of 4 Thunderbird alternatives