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Websites using RoundCube

Webmail Visit roundcube.net

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

Lead List Exporter

3.8k live RoundCube sites, ready to export.

That's how many RoundCube websites are in VersionDB right now, each with its full tech stack, contact details, and social profiles.

Pick a ready-made template, or build your own filters in the Lead List Exporter and pay only for the rows you export.

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RoundCube companies in the United States

Every RoundCube website we detected in the United States.

Companies with personnel emails

Only sites where a personal, company-hosted email was found.

Decision makers on LinkedIn

Sites with at least one personnel LinkedIn profile.

Top 100,000 RoundCube sites by traffic

Start with the highest-traffic end of the dataset.

Sites on a .com domain

Limit results to RoundCube websites on .com domains.

Companies with phone numbers

Only sites where an organisation phone number was found.

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Live Websites

Websites Using RoundCube

A sample of live RoundCube sites from our latest crawl, with the other technologies each one runs.

Open in the Lead List Exporter
DomainAlso runsCrawl Date
kmr.ru
jQueryPHPNginxHSTSjQuery UI
September 27, 2026
looksystems.net
jQueryPHPNginxBootstrapjQuery UI
September 27, 2026
ntl.com.br
jQueryPHPBootstrapjQuery UI
September 27, 2026
astelco.com.ar
jQueryPHPApache HTTP ServerBootstrapjQuery UI
September 26, 2026
roundcubeforum.net
jQueryPHPHTTP/3CloudflareGoogle Hosted Libraries
September 26, 2026
nitrex.net
jQueryPHPApache HTTP ServerBootstrapjQuery UI
September 26, 2026
postkaste.de
jQueryPHPNginxHSTSBootstrap
September 26, 2026
nxxt.de
jQueryPHPHSTSApache HTTP ServerBootstrap
September 24, 2026
boska.sk
jQueryPHPApache HTTP ServerBootstrapjQuery UI
September 24, 2026
nagraj.pl
jQueryPHPApache HTTP ServerBootstrapjQuery UI
September 23, 2026

How many websites use RoundCube?

We found RoundCube on 3,826 websites in our September 2026 crawl, across 106 countries.

Which countries use RoundCube the most?

By number of websites, the top countries are United States (11%, 429 sites), Germany (11%, 406 sites), Singapore (5%, 208 sites), Poland (5%, 191 sites) and Thailand (5%, 186 sites). Together they account for 37% of the 3,826 RoundCube sites we track. 70% of the sites are in English, and .com is the most used domain ending, on 28% of them.

Where are RoundCube websites hosted?

The networks carrying the most RoundCube sites are Tencent Building, Kejizhongyi Avenue (424 sites), Hetzner Online GmbH (253 sites) and OVH SAS (207 sites).

What technologies are used with RoundCube?

Across the 3,826 RoundCube sites we track, the technologies most often found alongside it are PHP (100%, 3,826 sites), jQuery (over 99%, 3,806 sites), jQuery UI (98%, 3,763 sites), Bootstrap (87%, 3,317 sites) and Apache HTTP Server (54%, 2,050 sites).

Deep Dive

Breakdown of RoundCube websites

What else they run, plus their language, hosting network, domain extension and country.

Same category

Other technologies in Webmail

Webmail technologies run on 0.01% of the websites we track. RoundCube ranks #1 of 8, on 55.35% of Webmail sites.

All Webmail technologies

FAQ

Answers drawn from our latest crawl of RoundCube websites. Anything else, email us and we will look it up.

Through our own crawl, which checks each site's HTML, scripts and headers rather than relying on self-reported data.