Open Source Roundcube Alternatives

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 many of them is open source so hopefully you can find a suitable replacement. Other interesting open source alternatives to Roundcube are Mailpile, Horde, Zimbra Collaboration Suite and Kolab Community.

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

This page was last updated

Roundcube

159

Free • Open Source
WebMail Provider

Self-Hosted
PHP
Cloudron

Roundcube webmail is a browser-based multilingual IMAP client with an application-like user interface. It provides full...

Learn more about Roundcube

Rainloop
Do you think this is a good alternative?
Yes
No
Free • Open Source
Email Client
Online
Self-Hosted
Nextcloud
JavaScript
PHP
Cloudron
12 alternatives to 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.
Suggest and vote on features
Rainloop Features
1. Ad-freeRainloop doesn't contain any form of external advertising.
2. Multiple Account supportRainloop support multiple accounts without the need to logout and login
IMAP Support
Dockerized
Encrypted Email
Rainloop vs Roundcube opinions
Almost everyone thinks Rainloop is a great alternative to Roundcube.
Guest
PHP based and customizable more than roundcube, more modern ui
Positive comment•
3

mandrael
It's popular, modern programmed, faster than roundcube, but not so feature rich. Much sits below the surface though.
Positive comment•
1
Mailpile
Do you think this is a good alternative?
Yes
No
Free • Open Source
Email Client
WebMail Provider
Linux
Online
Self-Hosted
OpenPGP
59 alternatives to 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.
Suggest and vote on features
Mailpile Features
1. OpenPGPMailpile supports OpenPGP, a standard of PGP encryption that is open-source for public use.
Web-Based
Encrypted Email
IMAP Support
POP3 Support
Discontinued
1.0.0 Release Candidate 6 from 2019 is the last version on GitHub (https://github.com/mailpile/Mailpile/releases). Possibly the development has been stopped.

Mailpile vs Roundcube opinions
Some users think Mailpile is a great alternative to Roundcube, some don't.
Guest
Mailpile needs to run on a computer
Negative comment•
2

Guest
Mailpile is single-user (personal) environment
Negative comment•
-1
Horde
Do you think this is a good alternative?
Yes
No
Free • Open Source
WebMail Provider
Online
Self-Hosted
40 alternatives to 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.
Suggest and vote on features
Horde Features
CalDAV Support
Discontinued
The last release (5.2.22) was in September 2017.

Horde vs Roundcube opinions
Most users think Horde is a great alternative to Roundcube.
Zimbra Collaboration Suite
Do you think this is a good alternative?
Yes
No
Freemium • Open Source
Mail Server
Calendar App
Team Collaboration Tool
Linux
Online
Self-Hosted
43 alternatives to 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.
Suggest and vote on features
Zimbra Collaboration Suite Features
1. Real time collaborationMultiple users can work together in Zimbra Collaboration Suite simultaneously.
ActiveSync
Active Directory integration
Kolab Community
Do you think this is a good alternative?
Yes
No
Freemium • Open Source
Linux
Online
Self-Hosted
43 alternatives to 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.
Suggest and vote on features
Kolab Community Features
1. Real time collaborationMultiple users can work together in Kolab Community simultaneously.
CalDAV Support
WebDAV Support
IMAP Support
CardDAV Support
Add a screenshot
Mail-in-a-box
Do you think this is a good alternative?
Yes
No
Free • Open Source
Mail Server
Self-Hosted
Roundcube
13 alternatives to Mail-in-a-box
Easy-to-deploy mail server.
Suggest and vote on features
Mail-in-a-box Features
IMAP Support
Nextcloud integration
SOGo
Do you think this is a good alternative?
Yes
No
Freemium • Open Source
WebMail Provider
Linux
Online
Thunderbird
Cloudron
65 alternatives to 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.
Suggest and vote on features
SOGo Features
Support for Multiple Users
Scheduling
CalDAV Support
CardDAV Support
Isotope Mail Client
Do you think this is a good alternative?
Yes
No
Free • Open Source
WebMail Provider
Email Client
Mac
Windows
Linux
Online
Self-Hosted
Kubernetes
Docker
OpenShift
11 alternatives to 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...).
Suggest and vote on features
Isotope Mail Client Features
1. AutocompletionIsotope Mail Client can predict and complete the rest of a word or phrase you're typing.
No database needed
Drag and Drop
Support for Docker
Web-Based
Rich text editing
Dockerized
Isotope Mail Client vs Roundcube opinions
Almost everyone thinks Isotope Mail Client is a great alternative to Roundcube.
OX App Suite
Do you think this is a good alternative?
Yes
No
Free • Open Source
Mail Server
WebMail Provider
Calendar App
Linux
Online
Self-Hosted
Software as a Service (SaaS)
20 alternatives to 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.
Suggest and vote on features
OX App Suite Features
1. Real time collaborationMultiple users can work together in OX App Suite simultaneously.
2. Cloud SyncSync your data (notes, documents, bookmarks, etc.) across your different devices and to the cloud.
3. Calendar IntegrationOX App Suite lets you sync your tasks and events with your calendar application.
Personal Information Manager (PIM)
Group Mail
German
WebDAV Support
WebDAV Sync
Squirrelmail
Do you think this is a good alternative?
Yes
No
Free • Open Source
WebMail Provider
Self-Hosted
PHP
17 alternatives to 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.
Suggest and vote on features
Squirrelmail Features
SMTP Support
IMAP Support
Exchange
On-premises software