Roundcube AlternativesOnly Open Source apps categorised as Email Clients

The best open source Email Client alternative to Roundcube is Rainloop. If that doesn't suit you, our users have ranked more than 25 alternatives to Roundcube and nine of them are open source Email Clients so hopefully you can find a suitable replacement. Other interesting open source Email Client alternatives to Roundcube are Mailpile, Kolab, SnappyMail and Cypht.

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Alternatives list

  1. Rainloop icon

    Rainloop

     58 likes
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    Simple, modern & fast web-based email client. Modest system requirements, decent performance, simple installation and upgrade, no database required. All these make RainLoop Webmail a perfect choice for your email solution.

    13 Rainloop alternatives

    Cost / License

    • Free
    • Open Source

    Application types

    Alerts

    • Discontinued

    Platforms

    • Online
    • Self-Hosted
    • Nextcloud
    • JavaScript
    • PHP
    • Cloudron
    Login
     
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    3
    28
    Comments about Rainloop as an Alternative to Roundcube
    mandrael
    Positive
    1

    It's popular, modern programmed, faster than roundcube, but not so feature rich. Much sits below the surface though.

    Guest
    Positive
    3

    PHP based and customizable more than roundcube, more modern ui

    Review by a new / low-activity user.
    EgorSharin
    Negative
    1

    The old version (no longer maintained since 2022) is still open-source on GitHub. The new version is closed-source.

    Roundcube Icon
    Rainloop icon

    • Almost everyone thinks Rainloop is a great Roundcube alternative.

    • Rainloop is the most popular Web-based & Self-Hosted alternative to Roundcube.

    • Rainloop is the most popular Open Source & free alternative to Roundcube.

    • Rainloop is Free and Open SourceRoundcube is also Free and Open Source
  2. Mailpile icon

    Mailpile

     117 likes
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    Mailpile is a modern, fast web-mail client with user-friendly encryption and privacy features. The development of Mailpile is funded by a large community of backers and all code related to the project is and will be released under an OSI approved Free Software license.

    59 Mailpile alternatives

    Cost / License

    • Free
    • Open Source

    Application types

    Alerts

    • Discontinued

    Platforms

    • Linux
    • Online
    • Self-Hosted
    • OpenPGP
    Mailpile screenshot 1
     
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    3
    12
    Comments about Mailpile as an Alternative to Roundcube
    Guest
    Negative
    0

    Mailpie is a descktop application but Roundcube is a selfhosted application.

    Review by a new / low-activity user.
    Guest
    Negative
    1

    Mailpile needs to run on a computer

    Review by a new / low-activity user.
    Guest
    Negative
    -1

    Mailpile is single-user (personal) environment

    Review by a new / low-activity user.
    Roundcube Icon
    Mailpile icon

    • Some users think Mailpile is a great Roundcube alternative, some don't.

    • Mailpile is the most popular Linux alternative to Roundcube.

    • Mailpile is Free and Open SourceRoundcube is also Free and Open Source
  4. Kolab icon

    Kolab

     43 likes
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    Kolab provides a FOSS communication & collaboration solution that can be completely self-hosted. Take back control of your data and access it via the webinterface, or existing mobile & desktop clients.

    Cost / License

    • Freemium (Subscription)
    • Open Source

    Application type

    Platforms

    • Linux
    • Online
    • Self-Hosted
     
  5. SnappyMail icon

    SnappyMail

     7 likes
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    The drastically upgraded & secured fork of RainLoop Webmail Community edition.

    13 SnappyMail alternatives

    Cost / License

    • Free
    • Open Source

    Application type

    Platforms

    • Self-Hosted
    • UNIX Web Browser
    • Cloudron
    SnappyMail screenshot 1
     
  6. Cypht icon

    Cypht

     10 likes
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    All your E-mail, from all your accounts, in one place. Cypht is like a news reader, but for E-mail. Cypht does not replace your existing accounts - it combines them into one. And it's also a news reader :).

    Cost / License

    • Free
    • Open Source

    Application type

    Platforms

    • Self-Hosted
    Cypht screenshot 1
     
  7. Isotope Mail Client icon

    Isotope Mail Client

     1 like
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    Microservice based webmail client built with ReactJS and Spring.

    Minimalistic webmail client which currently has the main features of any other mail client (read mail, compose mail, organize mail folders...).

    Cost / License

    • Free
    • Open Source

    Application types

    Alerts

    • Discontinued

    Platforms

    • Mac
    • Windows
    • Linux
    • Online
    • Self-Hosted
    • Kubernetes
    • Docker
    • OpenShift
    Inbox with some read e-mails
     
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    13

    • Almost everyone thinks Isotope Mail Client is a great Roundcube alternative.

    • Isotope Mail Client is the most popular Windows & Mac alternative to Roundcube.

    • Isotope Mail Client is Free and Open SourceRoundcube is also Free and Open Source

  9. CacoCloud

     10 likes
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    A simple, fast and secure PHP/AngularJS based single user feed and mail reader, password and bookmark manager. CacoCloud is divided into a RESTful PHP backend storing all data into a SQLite database and an SPA frontend based on AngularJs.

    Cost / License

    • Free
    • Open Source

    Application types

    Alerts

    • Discontinued

    Platforms

    • Self-Hosted
    • AngularJS
    Feed reader
     
  10. Nexmail icon

    Nexmail

     2 likes
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    NexMail is an open-source, modern webmail client designed for self-hosted email servers. Enjoy a clean, intuitive interface with powerful features for managing your emails efficiently.

    Cost / License

    • Free
    • Open Source

    Application types

    Platforms

    • Self-Hosted
    • PHP
    Main Page
     
  11. NeoMail icon

    NeoMail

     3 likes
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    NeoMail is a web-based mail client that allows users to access their mail spools and send messages. It does not require a POP3 server, or any shell access for the users. It interfaces directly with user mail spools.

    Cost / License

    • Free
    • Open Source

    Application types

    Alerts

    • Discontinued

    Platforms

    • Online
    NeoMail screenshot 1
     
9 of 9 Roundcube alternatives