Global Web Mail Usage Statistics and Market Share

We are tracking usage statistics and market share of 7 web technologies in Web Mail. In February 2025 the most popular web technology in Web Mail is RoundCube with 71% market share. In second place there is SquirrelMail with 12% market share. After that there are Zimbra with 10%, 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 February 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 4,498 websites using Web Mail in out database.

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

    RoundCube is free and open-source web-based IMAP email client.

  • SquirrelMail SquirrelMail

    SquirrelMail is an open-source web-mail package that is based on PHP language. It provides a web-based-email client and a proxy server for IMAP protocol.

  • Zimbra Zimbra

  • Outlook Web App Outlook Web App

    Outlook on the web is an information manager web app. It includes a web-based email client, a calendar tool, a contact manager, and a task manager.

  • RainLoop RainLoop

    RainLoop is a web-based email client.

  • Sympa Sympa

    Sympa is an open-source mailing list management (MLM) software.

  • CrossBox CrossBox

    CrossBox is a webmail client.

Web Mail Market Share History in Last 12 Months
Technology April 2024May 2024June 2024July 2024August 2024September 2024October 2024November 2024December 2024January 2025February 2025
RoundCube69.76%69.79%69.77%69.80%69.95%70.08%70.12%70.17%70.31%70.61%70.65%
SquirrelMail12.29%12.28%12.29%12.28%12.24%12.18%12.11%12.11%12.12%12.04%11.98%
Zimbra9.58%9.57%9.58%9.60%9.56%9.54%9.58%9.57%9.47%9.43%9.54%
Outlook Web App5.76%5.74%5.73%5.70%5.66%5.57%5.55%5.51%5.44%5.41%5.34%
RainLoop2.51%2.51%2.51%2.51%2.48%2.51%2.53%2.52%2.54%2.41%2.38%
Sympa0.07%0.07%0.07%0.07%0.07%0.07%0.07%0.07%0.07%0.07%0.07%
CrossBox0.04%0.04%0.04%0.04%0.04%0.04%0.04%0.04%0.04%0.04%0.04%