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%.

Web Mail Market Share in May 2025
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 4,839 websites using Web Mail in out database.

Web Mail Usage Statistics and Market Share in May 2025
Technologies in Web Mail
  • RoundCube 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

    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

    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

    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

    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

    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

    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 2024August 2024September 2024October 2024November 2024December 2024January 2025February 2025March 2025April 2025May 2025
RoundCube69.80%69.95%70.08%70.12%70.17%70.31%70.61%70.69%70.92%71.60%71.90%
SquirrelMail12.28%12.24%12.18%12.11%12.11%12.12%12.04%11.96%11.81%11.56%11.35%
Zimbra9.60%9.56%9.54%9.58%9.57%9.47%9.43%9.53%9.50%9.22%9.20%
Outlook Web App5.70%5.66%5.57%5.55%5.51%5.44%5.41%5.32%5.26%5.09%4.98%
RainLoop2.51%2.48%2.51%2.53%2.52%2.54%2.41%2.39%2.40%2.43%2.46%
Sympa0.07%0.07%0.07%0.07%0.07%0.07%0.07%0.07%0.07%0.06%0.06%
CrossBox0.04%0.04%0.04%0.04%0.04%0.04%0.04%0.04%0.04%0.04%0.06%