Roundcube
| Roundcube | |
|---|---|
 | |
 | |
| Original author | Thomas Bruederli |
| Developer | The Roundcube Team |
| Release | March 4, 2008 |
| Stable release | 1.7.4 
/ 6 September 2026 |
| Written in | PHP |
| Operating system | Cross-platform |
| Type | Webmail |
| License | GPL-3.0-or-later with exceptions for skins and plugins |
| Website | roundcube |
Roundcube is a web-based IMAP email client written in PHP. It uses Ajax throughout its interface and is licensed under the GNU GPL version 3 or later, with exceptions for skins and plugins. In recent years the software has frequently suffered severe data breaches due to major vulnerabilities.