Open Source Roundcube AlternativesTop WebMail Providers & Email Clients like Roundcube

The best open source alternative to Roundcube is Rainloop. If that doesn't suit you, our users have ranked more than 25 alternatives to Roundcube and 19 is open source so hopefully you can find a suitable replacement. Other interesting open source alternatives to Roundcube are Mailpile, Kolab, SOGo and Mail-in-a-box.

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Roundcube alternatives are mainly WebMail Providers, but if you're looking for Email Clients or Mail Servers you can filter on that. Other popular filters include Self-Hosted and Open Source. These are just examples - use the filter bar below to find more specific alternatives to Roundcube.
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Alternatives list

  1. Rainloop icon

    Rainloop

     58 likes

    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 (MIT)

    Application type

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    The old version (no longer maintained since 2022) is still open-source on GitHub.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

    Rainloop icon
    Rainloop icon

    • Almost everyone thinks Rainloop is a great Roundcube alternative.

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

    Mailpile

     117 likes

    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.

    Cost / License

    • Free
    • Open Source

    Application type

    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.
    Mailpile icon
    Mailpile icon

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

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

    Kolab

     43 likes

    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.

    48 Kolab alternatives

    Cost / License

    • Freemium
    • Open Source

    Application type

    Platforms

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

    SOGo

     30 likes

    SOGo is groupware server with a focus on scalability and open standards.

    SOGo provides a rich AJAX-based Web interface and supports multiple native clients through the use of standard protocols such as CalDAV, CardDAV and GroupDAV.Share your calendars, address books and mails in.

    61 SOGo alternatives

    Cost / License

    Application type

    Platforms

    • Linux
    • Online
    • Thunderbird
    • Cloudron
    SOGo screenshot 1
     
  7. Horde icon

    Horde

     29 likes

    Horde Groupware is a free, enterprise ready, browser based collaboration suite. Users can manage and share calendars, contacts, tasks and notes with the standards compliant components from the Horde Project.

    41 Horde alternatives

    Cost / License

    • Free
    • Open Source

    Application type

    Alerts

    • Discontinued

    Platforms

    • Online
    • Self-Hosted
    Horde screenshot 1
     
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    8
  10. OX App Suite icon

    OX App Suite

     15 likes

    The OX App Suite by Open-Xchange is web-based platform offering a suite of apps like an email client, calendar, contacts magement, cloud storage with synchronization and productivity apps for word processing, spreadsheets and presentations.

    Cost / License

    • Free
    • Open Source

    Application type

    Platforms

    • Linux
    • Online
    • Self-Hosted
    • Software as a Service (SaaS)
    OX Portal
     
  11. Cypht icon

    Cypht

     10 likes

    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

    Application type

    Platforms

    • Self-Hosted
    Cypht screenshot 1
     

  12. NeutronMail

     8 likes

    Self-hosted server for the Proton Mail client.

    Cost / License

    • Free
    • Open Source

    Application type

    Alerts

    • Discontinued

    Platforms

    • Online
    • Self-Hosted
     
  13. Webmail Lite icon

    Webmail Lite

     17 likes

    Open Source WebMail Lite is a free community edition of full-featured WebMail Pro server application intended for users who need a clean and simple web mail application, which is fast and easy to use. Whether you need a free web browser based email client software for Windows ASP.

    Cost / License

    • Free
    • Open Source

    Application type

    Platforms

    • Online
    • Self-Hosted
    Afterlogic Webmail Lite
     
  14. Isotope Mail Client icon

    Isotope Mail Client

     1 like

    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

    Application type

    Alerts

    • Discontinued

    Platforms

    • Mac
    • Windows
    • Linux
    • Online
    • Self-Hosted
    • Kubernetes
    • Docker
    • OpenShift
    Inbox with some read e-mails
     
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    13
12 of 19 Roundcube alternatives