Global Web Mail Usage Statistics and Market Share
We are tracking usage statistics and market share of 7 web technologies in Web Mail. In May 2025 the most popular web technology in Web Mail is RoundCube with 72% market share. In second place there is SquirrelMail with 11% market share. After that there are Zimbra with 9%, Outlook Web App with 2% and RainLoop with 2% market share. Top 5 web technologies together have 97% market share. The remaining 2 web technologies in Web Mail have a combined market share of 3%.
About Web Mail
Web mail is an email client implemented as a web application running on a web server.
We are tracking 7 different technologies in Web Mail.
There are 4,849 websites using Web Mail in out database.
Web Mail Usage Statistics and Market Share in May 2025
#1 RoundCube 
71.93%
#2 SquirrelMail 
11.34%
#3 Zimbra 
9.18%
#4 Outlook Web App 
4.97%
#5 RainLoop 
2.45%
#6 CrossBox 
0.06%
#7 Sympa 
0.06%
Technologies in Web Mail
RoundCube
RoundCube is a webmail client that allows users to access and manage their email through a web browser, providing features such as composing, sending, and managing emails, as well as accessing attachments and address books. It is designed to be easy to use and compatible with various email servers.
SquirrelMail
SquirrelMail is an open-source webmail application that allows users to access and manage their email directly from any web browser, eliminating the need for dedicated email client software. It provides a user-friendly interface for composing, reading, and organizing emails, as well as managing contacts and settings. SquirrelMail is highly customizable and can be easily integrated with various email servers.
Zimbra
Zimbra is a powerful, open-source email, collaboration, and communication platform that offers web-based email, calendaring, task management, and instant messaging in a single, easy-to-use interface. It integrates seamlessly with popular devices and services, providing a comprehensive solution for both individuals and organizations.
Outlook Web App
Outlook Web App (OWA) is a web-based interface for accessing Microsoft Exchange email, calendar, and contacts from any internet-connected device. It offers a familiar Outlook experience, including email composition, task management, and calendar events. The service is accessible via any modern web browser.
RainLoop
RainLoop is a modern, web-based email client that offers a user-friendly interface for managing email accounts, providing a seamless experience for both personal and business use. It's lightweight, fast, and supports multiple email protocols. RainLoop can be easily installed and configured on various platforms, making it a popular choice for hosting providers and individuals seeking a customizable email solution.
CrossBox
CrossBox is an online service that provides a secure and user-friendly webmail interface, allowing users to access, send, and manage their emails through any device with internet access. It offers advanced security features and a customizable interface to enhance user experience. CrossBox is a reliable and convenient solution for those seeking a secure and accessible email management service.
Sympa
Sympa is a web-based tool designed for managing email lists, while also providing web mail services. It allows users to easily create, manage, and moderate mailing lists, as well as access their email through a web interface. The platform is known for its simplicity, reliability, and extensive feature set.
Web Mail Market Share History in Last 12 Months
| Technology | July 2024 | August 2024 | September 2024 | October 2024 | November 2024 | December 2024 | January 2025 | February 2025 | March 2025 | April 2025 | May 2025 |
|---|---|---|---|---|---|---|---|---|---|---|---|
| RoundCube | 69.80% | 69.95% | 70.08% | 70.12% | 70.17% | 70.31% | 70.61% | 70.69% | 70.92% | 71.60% | 71.93% |
| SquirrelMail | 12.28% | 12.24% | 12.18% | 12.11% | 12.11% | 12.12% | 12.04% | 11.96% | 11.81% | 11.56% | 11.34% |
| Zimbra | 9.60% | 9.56% | 9.54% | 9.58% | 9.57% | 9.47% | 9.43% | 9.53% | 9.50% | 9.22% | 9.18% |
| Outlook Web App | 5.70% | 5.66% | 5.57% | 5.55% | 5.51% | 5.44% | 5.41% | 5.32% | 5.26% | 5.09% | 4.97% |
| RainLoop | 2.51% | 2.48% | 2.51% | 2.53% | 2.52% | 2.54% | 2.41% | 2.39% | 2.40% | 2.43% | 2.45% |
| Sympa | 0.07% | 0.07% | 0.07% | 0.07% | 0.07% | 0.07% | 0.07% | 0.07% | 0.07% | 0.06% | 0.06% |
| CrossBox | 0.04% | 0.04% | 0.04% | 0.04% | 0.04% | 0.04% | 0.04% | 0.04% | 0.04% | 0.04% | 0.06% |