Global Web Mail Usage Statistics and Market Share
We are tracking usage statistics and market share of 7 web technologies in Web Mail. In September 2023 the most popular web technology in Web Mail is RoundCube with 69% market share. In second place there is SquirrelMail with 13% market share. After that there are Zimbra with 10%, Outlook Web App with 3% and RainLoop with 3% 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 4,643 websites using Web Mail in out database.
Web Mail Usage Statistics and Market Share in September 2023
#1 RoundCube 
68.83%
#2 SquirrelMail 
12.94%
#3 Zimbra 
9.78%
#4 Outlook Web App 
5.77%
#5 RainLoop 
2.56%
#6 Sympa 
0.06%
#7 CrossBox 
0.04%
Technologies in Web Mail
RoundCube
RoundCube is free and open-source web-based IMAP email client.
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
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 is a web-based email client.
Sympa
Sympa is an open-source mailing list management (MLM) software.
CrossBox
CrossBox is a webmail client.
Web Mail Market Share History in Last 12 Months
| Technology | November 2022 | December 2022 | January 2023 | February 2023 | March 2023 | April 2023 | May 2023 | June 2023 | July 2023 | August 2023 | September 2023 |
|---|---|---|---|---|---|---|---|---|---|---|---|
| RoundCube | 66.64% | 66.80% | 67.18% | 67.43% | 75.11% | 67.76% | 67.95% | 68.25% | 68.58% | 68.74% | 68.83% |
| SquirrelMail | 14.09% | 14.01% | 13.78% | 13.63% | 15.04% | 13.41% | 13.34% | 13.15% | 13.04% | 12.93% | 12.94% |
| Zimbra | 10.11% | 10.08% | 9.99% | 9.98% | 11.11% | 9.99% | 9.96% | 9.98% | 9.78% | 9.81% | 9.78% |
| Outlook Web App | 6.25% | 6.21% | 6.13% | 6.06% | 6.72% | 6.06% | 5.99% | 5.90% | 5.91% | 5.85% | 5.77% |
| RainLoop | 2.79% | 2.79% | 2.82% | 2.80% | 3.05% | 2.67% | 2.65% | 2.61% | 2.59% | 2.56% | 2.56% |
| Sympa | 0.07% | 0.07% | 0.06% | 0.06% | 0.07% | 0.06% | 0.06% | 0.06% | 0.06% | 0.06% | 0.06% |
| CrossBox | 0.04% | 0.04% | 0.04% | 0.04% | 0.05% | 0.04% | 0.04% | 0.04% | 0.04% | 0.04% | 0.04% |