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, SnappyMail, Zimbra Collaboration Suite and Horde.

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Roundcube alternatives are mainly WebMail Providers but may also be Email Clients or Mail Servers. Filter by these or use the filter bar below if you want a narrower list of alternatives or looking for a specific functionality of Roundcube.

Roundcube

165

WebMail Provider
Free • Open Source

Roundcube webmail is a browser-based multilingual IMAP client with an application-like user interface. It provides full functionality you expect from an e-mail client, including MIME support, address book, folder...

More about Roundcube

Roundcube alternatives page was last updated Jun 24, 2024

Rainloop
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.
12 Rainloop alternatives
License model
- Free • Open Source
Application type
- Email Client
Platforms
- Online
- Self-Hosted
- Nextcloud
- JavaScript
- PHP
- Cloudron
Rainloop Features
1. Ad-free
2. Multiple Account support
3. IMAP Support
4. Dockerized
5. Encrypted Email
Show all NaN Rainloop features ▾
Discontinued
The last update is from August 2022.
Rainloop VS Roundcube
Is Rainloop a good alternative to Roundcube?
Comments about Rainloop as an Alternative to Roundcube

mandrael
It's popular, modern programmed, faster than roundcube, but not so feature rich. Much sits below the surface though.
Positive comment •Apr 27, 2020
1
EgorSharin
The old version (no longer maintained since 2022) is still open-source on GitHub. The new version is closed-source.
Negative comment •Feb 19, 2024
1
Guest
PHP based and customizable more than roundcube, more modern ui
Positive comment •Sep 7, 2017
3
- 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

Mailpile
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
License model
- Free • Open Source
Application types
- Email Client
- WebMail Provider
Platforms
- Linux
- Online
- Self-Hosted
- OpenPGP
Mailpile Features
1. OpenPGP
2. Web-Based
3. Encrypted Email
4. IMAP Support
5. POP3 Support
Show all NaN Mailpile features ▾
Mailpile VS Roundcube
Is Mailpile a good alternative to Roundcube?
Comments about Mailpile as an Alternative to Roundcube

Guest
Mailpie is a descktop application but Roundcube is a selfhosted application.
Negative comment •Jun 24, 2024
0
Guest
Mailpile needs to run on a computer
Negative comment •Jan 9, 2018
1
Guest
Mailpile is single-user (personal) environment
Negative comment •Jul 11, 2018
-1
- 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

SnappyMail
The drastically upgraded & secured fork of RainLoop Webmail Community edition.
12 SnappyMail alternatives
License model
- Free • Open Source
Application type
- Email Client
Platforms
- Self-Hosted
- Web Browser
Top SnappyMail Features
1. Lightweight
2. Dark Mode
3. PGP Encryption
4. WYSIWYG Support
5. Privacy focused
6. Extensible by Plugins/Extensions
7. Ad-free
8. Multiple Account support
9. Support for Themes
10. No Tracking
11. Two-factor Authentication
12. GPG Encryption
Show all NaN SnappyMail features ▾
SnappyMail VS Roundcube
Is SnappyMail a good alternative to Roundcube?

Zimbra Collaboration Suite
Zimbra Collaboration is an open, secure collaboration tool for email, calendaring, tasks and more. With the most innovative web application available today, Zimbra boosts the productivity of users on any desktop and dramatically reduces TCO compared to legacy platform vendors.
43 Zimbra Collaboration Suite alternatives
License model
- Freemium • Open Source
Application types
- Mail Server
- Calendar App
Platforms
- Linux
- Online
- Self-Hosted
Zimbra Collaboration Suite Features
Real time collaboration
ActiveSync
Active Directory integration
Show all NaN Zimbra Collaboration Suite features ▾
Zimbra Collaboration Suite VS Roundcube
Is this a good alternative to Roundcube?

Horde
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.
43 Horde alternatives
License model
- Free • Open Source
Application type
- WebMail Provider
Platforms
- Online
- Self-Hosted
Horde Features
CalDAV Support
Show all NaN Horde features ▾
Discontinued
The last release (5.2.22) was in September 2017.

Horde VS Roundcube
Is Horde a good alternative to Roundcube?

Mail-in-a-box
Easy-to-deploy mail server.
15 Mail-in-a-box alternatives
License model
- Free • Open Source
Application type
- Mail Server
Platforms
- Self-Hosted
- Roundcube
Mail-in-a-box Features
IMAP Support
Nextcloud integration
Show all NaN Mail-in-a-box features ▾
Mail-in-a-box VS Roundcube
Is Mail-in-a-box a good alternative to Roundcube?

Kolab Community
Kolab is entirely Free and Open Source Software (a.k.a. FOSS), and uses Open Standards. We’ll get to why this is important to us, and hope that it is important to you thereafter.
44 Kolab Community alternatives
License model
- Freemium • Open Source
Platforms
- Linux
- Online
- Self-Hosted
Kolab Community Features
1. Real time collaboration
2. CalDAV Support
3. WebDAV Support
4. IMAP Support
5. CardDAV Support
Show all NaN Kolab Community features ▾
Kolab Community VS Roundcube
Is Kolab Community a good alternative to Roundcube?

SOGo
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.
63 SOGo alternatives
License model
- Freemium • Open Source
Application type
- WebMail Provider
Platforms
- Linux
- Online
- Thunderbird
- Cloudron
SOGo Features
Support for Multiple Users
Scheduling
CalDAV Support
CardDAV Support
Show all NaN SOGo features ▾
SOGo VS Roundcube
Is SOGo a good alternative to Roundcube?

Isotope Mail Client
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...).
11 Isotope Mail Client alternatives
License model
- Free • Open Source
Application types
- WebMail Provider
- Email Client
Platforms
- Mac
- Windows
- Linux
- Online
- Self-Hosted
- Kubernetes
- Docker
- OpenShift
+5
Isotope Mail Client Features
1. Autocompletion
2. No database needed
3. Drag and Drop
4. Support for Docker
5. Web-Based
6. Rich text editing
7. Dockerized
Show all NaN Isotope Mail Client features ▾
Discontinued
Last update on Dec 8, 2019.
Isotope Mail Client VS Roundcube
Is Isotope Mail Client a good alternative to Roundcube?
- 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

Squirrelmail
SquirrelMail is a standards-based webmail package written in PHP. It includes built-in pure PHP support for the IMAP and SMTP protocols, and all pages render in pure HTML 4.0 (with no JavaScript required) for maximum compatibility across browsers.
17 Squirrelmail alternatives
License model
- Free • Open Source
Application type
- WebMail Provider
Platforms
- Self-Hosted
- PHP
Squirrelmail Features
SMTP Support
IMAP Support
Exchange
On-premises software
Show all NaN Squirrelmail features ▾
Squirrelmail VS Roundcube
Is Squirrelmail a good alternative to Roundcube?

OX App Suite
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.
19 OX App Suite alternatives
License model
- Free • Open Source
Application types
- Mail Server
- WebMail Provider
Platforms
- Linux
- Online
- Self-Hosted
- Software as a Service (SaaS)
+6
OX App Suite Features
1. Real time collaboration
2. Cloud Sync
3. Calendar Integration
4. Personal Information Manager (PIM)
5. Group Mail
6. German
7. WebDAV Support
8. WebDAV Sync
Show all NaN OX App Suite features ▾
OX App Suite VS Roundcube
Is OX App Suite a good alternative to Roundcube?
- OX App Suite is the most popular SaaS alternative to Roundcube.
- OX App Suite is Free and Open SourceRoundcube is also Free and Open Source

Webmail Lite
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.
30 Webmail Lite alternatives
License model
- Free • Open Source
Application type
- WebMail Provider
Platforms
- Online
- Self-Hosted
+2
Webmail Lite VS Roundcube
Is Webmail Lite a good alternative to Roundcube?