Technology · Webmail
3,037 websites in the live index use RoundCube as of October 2026. Download the full list of RoundCube websites with website, company, country and language.
SourceAs of October 27, 2026, TechLeads detects RoundCube on 3,037 websites: 0.35% of Webmail detections, the 2nd most-used of 7 Webmail technologies we track.
Sample results for RoundCube. Description is shown under each title.
| Rank | Website | Title · Description | Company | Country | Language |
|---|---|---|---|---|---|
| #172,758 | waste.org | W.A.S.T.E. | - | - | - |
| #500,000 | attmail.pl | AttHost Webmail :: Witamy w AttHost Webmail | - | - | - |
| #500,000 | buzondecorreo.com | Webmail :: Welcome to Webmail | - | - | - |
| #500,000 | poczta-shoparena.pl | poczta-shoparena.pl :: Witamy w poczta-shoparena.pl | - | - | - |
| #1,000,000 | saremail.com | Bienvenido a | - | - | - |
| #1,000,000 | postamerkezi.com | EclitGO Posta Merkezi :: Welcome to EclitGO Posta Merkezi | - | - | - |
| #5,000,000 | sprintmail.ru | Вход в почту Спринтхост | - | - | - |
| #8 | dpoczta.pl | dPoczta.pl :: Welcome to dPoczta.plPoczta dhosting.pl to profesjonalne narzędzie do obsługi poczty e-mail przez przeglądarkę. Wysyłaj, odbieraj wiadomości i zarządzaj swoją bazą kontaktów! | - | - | - |
| #9 | 36911.net | Roundcube Webmail :: 欢迎使用 Roundcube Webmail | - | - | eng |
| #10 | business-webmail.de | Business Webmail :: Willkommen bei Business Webmail | - | - | - |
| #11 | brite.email | Roundcube Webmail :: Welcome to Roundcube Webmail | - | - | eng |
| #12 | fulcro.email | Roundcube Webmail :: Welcome to Roundcube Webmail | - | - | eng |
| #13 | iaeo.top | Roundcube Webmail :: 欢迎使用 Roundcube Webmail | - | - | eng |
| #14 | serviciodecorreo.es | Webmail :: Welcome to Webmail | - | - | en |
| #15 | grossrieder-import.ch | Roundcube Webmail :: Welcome to Roundcube Webmail | - | - | eng |
| #16 | mobilsoft.com.ua | Roundcube Webmail :: Welcome to Roundcube Webmail | - | - | eng |
| #17 | yolamail.com | Webmail :: Welcome to Webmail | - | - | en |
| #18 | schluessler.net | Roundcube Webmail :: Welcome to Roundcube Webmail | - | - | eng |
| #19 | dinoparadise.us | Roundcube Webmail :: Welcome to Roundcube Webmail | - | - | eng |
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The most-used Webmail technologies in the TechLeads index, by number of websites. RoundCube accounts for 0.35% of Webmail detections (3,037 websites).
| No. | Technology | Websites | Share of Webmail | Relative size |
|---|---|---|---|---|
| 01 | Apple iCloud Mail | 861,936 | 99.4% | |
| 02 | Outlook Web App | 1,553 | 0.18% |
TechLeads scans public websites and identifies RoundCube from signals in the page HTML, scripts, cookies, HTTP headers and DNS records. Website counts refresh daily; this page uses data from October 27, 2026. Counts only include websites we have scanned, so they can differ from other providers.
The TechLeads live index currently lists 3,037 websites using RoundCube. Open the sample table on this page or download the lead list.
The chart on this page is monthly HTTP Archive crawl detections for RoundCube, compared with other Webmail technologies. It is not the TechLeads live index.
In the same HTTP Archive category, RoundCube is charted against Apple iCloud Mail, Proton Mail, Zimbra, Outlook Web App, SquirrelMail. Live-index co-occurrence on this page is a separate signal.
Companies and websites using RoundCube in the TechLeads index include waste.org, attmail.pl, buzondecorreo.com, poczta-shoparena.pl, saremail.com. The full list of 3,037 websites, with company name, country and language, is available as a CSV export.
TechLeads scans public websites and matches RoundCube by signals in the page HTML, scripts, cookies, HTTP headers and DNS records. Website counts refresh daily.
Yes. A one-time RoundCube dataset is $29 as a CSV. The Growth plan ($79/mo) covers 10 technologies with recurring exports, alerts and API access.
Top-ranked sites on RoundCubeRank
Monthly detections of RoundCube in the HTTP Archive crawl. This is historical crawl coverage, not the TechLeads live website index.
Same HTTP Archive category (Webmail), not the whole web. Toggle competitors on or off.
Optional rank bands from the crawl (top 1k through long tail). Missing months are crawl gaps, not uninstalls.
Technologies most frequently detected on the same websites as RoundCube. Counts are websites in the live index.
Sites where we first detected RoundCube, by week (UTC, weeks start Monday). These are newly detected sites, and the counts follow our discovery coverage.
31
sites newly detected in the last 12 weeks
RoundCube is free and open-source web-based IMAP email client.
Our comprehensive database contains 3,037 websites using RoundCube, making it the most complete RoundCube sites list available. This RoundCube customer websites directory helps businesses detect websites using RoundCube and identify potential leads.
Websites using RoundCube commonly also use PHP, jQuery, jQuery UI, Bootstrap, Apache HTTP Server — reflecting typical RoundCube technology stacks.
Our RoundCube technology detection system scans millions of websites to identify those powered by RoundCube. This list of sites with RoundCube includes detailed information such as company names, contact details, social media profiles, and website rankings. Whether you're looking for top websites with RoundCube or exploring RoundCube adoption trends, our database provides comprehensive insights.
Each entry in our RoundCube sites list includes valuable data points: domain name, global ranking, company information, contact details, social media links. This makes it easy to detect websites using RoundCube and reach out to potential customers or partners.
Get instant access to the full list of sites with RoundCube in CSV format. Our dataset includes all 3,037 RoundCube customer websites with complete contact information, perfect for lead generation, market research, and competitive analysis. The data is regularly updated to ensure accuracy and includes the latest RoundCube powered websites.
