Global Web Mail Usage Statistics and Market Share

We are tracking usage statistics and market share for 8 web technologies in the Web Mail market. As of February 2026, the most popular web technology in Web Mail is RoundCube, with 76% market share. In second place is SquirrelMail, with 10%. After that, Zimbra holds 8%, followed by Outlook Web App with 2% and RainLoop with 2%. Top 5 web technologies together account for 98% of the market. The remaining 3 web technologies in Web Mail collectively have a 2% market share.

Last updated: 8 February 2026

Web Mail Market Share in February 2026

About Web Mail

Web mail is an email client implemented as a web application running on a web server.

We are tracking 8 different technologies in Web Mail.

There are 6,211 websites using Web Mail in out database.

Web Mail Usage Statistics and Market Share in February 2026

#1 RoundCube 75.56%

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.

#2 SquirrelMail 9.55%

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.

#3 Zimbra 8.16%

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.

#4 Outlook Web App 4.40%

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.

#5 RainLoop 2.21%

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.

#6 Sympa 0.05%

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.

#7 CrossBox 0.05%

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.

#8 Open-Xchange App Suite 0.03%

Open-Xchange App Suite is a cloud-based email and collaboration platform that provides web mail, calendar, contacts, task management, and other productivity tools, enabling users to stay connected and productive from anywhere. It offers advanced features such as multi-device synchronization, email encryption, and seamless integration with popular third-party applications.