Websites Powered by RoundCube
5,341 websites tracked using RoundCube (Webmail) · roundcube.net
RoundCube is a webmail interface for reading email in a browser. Its official site is roundcube.net. PoweredBy tracks the websites that use RoundCube across the public web; the tracked counts, adoption trend, and site list on this page are updated from our ongoing crawl of the webmail ecosystem.
Usage trend
1K
2K
3K
Jun 2018
Jul 2020
Aug 2022
Sep 2024
Oct 2026
Domains observed using RoundCube in each month's HTTP Archive crawl,
Jun 2018 to Oct 2026 · peak 2,149 in Jan 2025. The tracked total above also
counts sites not re-crawled recently.
Core Web Vitals
LCP 1.5 s
INP 75 ms
CLS 0
TTFB 600 ms
Median site among 3,769 RoundCube sites with Chrome UX data, p75 values, Sep 2026.
Top countries
United States
826
Germany
722
India
646
Brazil
589
United Kingdom
538
France
530
Italy
508
Netherlands
490
Sites using RoundCube by audience country, Chrome UX Report.
Usage by industry
| Industry | Share | Websites |
|---|---|---|
| Government | 0.12% | 11 |
| Education | 0.04% | 27 |
| Arts and entertainment | 0.03% | 15 |
| Industrial and manufacturing | 0.02% | 1 |
| Blogs and publishing | 0.01% | 4 |
| News and media | 0.01% | 6 |
| Non-profit and religious | <0.01% | 1 |
| Finance and insurance | <0.01% | 2 |
| Software and apps | <0.01% | 9 |
| Retail | <0.01% | 18 |
| Professional services | <0.01% | 2 |
| Automotive | <0.01% | 3 |
Share of each industry's websites with a detected stack that use RoundCube; industries come from what sites declare in their own structured data.
Top sites by authority
9+
0% · 0 of 372 sites
8+
1% · 78 of 7,677 sites
7+
<1% · 254 of 45,712 sites
6+
<1% · 401 of 110,136 sites
5+
<1% · 561 of 246,751 sites
The share of the web's most authoritative domains, by Open Page Rank tier, seen running RoundCube in recent crawls. Only 372 domains worldwide score 9 or higher.
Websites using RoundCube
| # | Domain | Open Page RankOPR | Est. monthly visits (US)Visits (US) | Keywords | First seen |
|---|---|---|---|---|---|
| 1 | cmu.edu | 8.97/10 | 436,800 | 81,774 | Jun 2025 |
| 2 | ubc.ca | 8.84/10 | 14,500 | 2,813 | Aug 2022 |
| 3 | nrw.de | 8.83/10 | - | - | Jan 2019 |
| 4 | cnrs.fr | 8.82/10 | 4,300 | 2,992 | Jul 2020 |
| 5 | mpg.de | 8.81/10 | 59,700 | 20,903 | Feb 2019 |
| 6 | fc2.com | 8.80/10 | 5,100 | 10 | Aug 2022 |
| 7 | dreamhost.com | 8.76/10 | 34,700 | 11,034 | Feb 2020 |
| 8 | telekom.de | 8.73/10 | 3,400 | 4,133 | Aug 2025 |
| 9 | in.net | 8.69/10 | - | - | May 2025 |
| 10 | mystrikingly.com | 8.61/10 | - | - | May 2023 |
| 11 | tum.de | 8.61/10 | 7,800 | 7,642 | Jan 2019 |
| 12 | krakow.pl | 8.59/10 | 690 | 649 | Aug 2022 |
| 13 | unam.mx | 8.58/10 | 1,900 | 1,196 | Aug 2018 |
| 14 | cnr.it | 8.57/10 | 810 | 1,174 | Jan 2019 |
| 15 | jouwweb.nl | 8.56/10 | 6 | 20 | Aug 2018 |
| 16 | uni-muenchen.de | 8.56/10 | - | - | Jan 2022 |
| 17 | cuni.cz | 8.56/10 | 4,400 | 1,637 | Sep 2020 |
| 18 | spb.ru | 8.53/10 | - | - | Aug 2022 |
| 19 | uni-stuttgart.de | 8.53/10 | 1,600 | 2,181 | Aug 2022 |
| 20 | uni-hamburg.de | 8.53/10 | 5,500 | 3,110 | Oct 2026 |
| 21 | hu-berlin.de | 8.52/10 | 5,200 | 2,027 | Aug 2022 |
| 22 | unizar.es | 8.51/10 | 280 | 138 | Nov 2021 |
| 23 | poznan.pl | 8.47/10 | 320 | 564 | Nov 2022 |
| 24 | unipd.it | 8.41/10 | 3,000 | 3,552 | Sep 2025 |
| 25 | ugr.es | 8.38/10 | 8,500 | 8,711 | Aug 2022 |
| 26 | lodz.pl | 8.37/10 | 90 | 193 | Aug 2022 |
| 27 | umu.se | 8.37/10 | 3,300 | 3,203 | Aug 2022 |
| 28 | wroc.pl | 8.36/10 | - | - | Nov 2021 |
| 29 | ufmg.br | 8.36/10 | 3,300 | 1,765 | Jan 2019 |
| 30 | uv.es | 8.35/10 | 19,100 | 19,126 | Oct 2024 |
| 31 | tu-darmstadt.de | 8.34/10 | 3,000 | 2,060 | Nov 2023 |
| 32 | unicamp.br | 8.34/10 | 860 | 1,061 | Jul 2026 |
| 33 | osaka-u.ac.jp | 8.34/10 | 1,900 | 915 | Jan 2023 |
| 34 | webnode.com | 8.33/10 | 14,400 | 5,856 | Apr 2025 |
| 35 | cas.cz | 8.33/10 | - | - | Aug 2022 |
| 36 | hover.com | 8.32/10 | 21,700 | 1,965 | Jan 2022 |
| 37 | unipi.it | 8.32/10 | 1,500 | 1,950 | Aug 2022 |
| 38 | lmu.de | 8.31/10 | 18,700 | 7,012 | May 2024 |
| 39 | ebi.ac.uk | 8.29/10 | 113,500 | 32,727 | Jan 2019 |
| 40 | cuhk.edu.hk | 8.29/10 | 5,100 | 1,878 | Feb 2023 |
| 41 | reg.ru | 8.27/10 | 85 | 180 | Jun 2020 |
| 42 | myshoptet.com | 8.27/10 | - | - | Jun 2021 |
| 43 | softonic.com | 8.27/10 | 1,400 | 7,154 | Jul 2022 |
| 44 | uni-due.de | 8.27/10 | 1,800 | 2,153 | Aug 2022 |
| 45 | upc.edu | 8.27/10 | 1,400 | 1,502 | Aug 2022 |
| 46 | fiocruz.br | 8.27/10 | 500 | 722 | Jan 2019 |
| 47 | loopia.se | 8.25/10 | 130 | 49 | Aug 2018 |
| 48 | uni-kiel.de | 8.25/10 | 1,300 | 766 | Jan 2019 |
| 49 | ulisboa.pt | 8.25/10 | 6,100 | 1,009 | Dec 2020 |
| 50 | ufrgs.br | 8.25/10 | 1,600 | 3,108 | May 2019 |
| 51 | gda.pl | 8.24/10 | - | - | Aug 2022 |
| 52 | uj.edu.pl | 8.24/10 | 360 | 132 | Oct 2024 |
| 53 | lycos.com | 8.23/10 | 6,600 | 319 | Jan 2022 |
| 54 | uba.ar | 8.21/10 | 670 | 586 | Aug 2022 |
| 55 | uc.pt | 8.21/10 | 3,500 | 1,118 | Jun 2023 |
| 56 | porkbun.com | 8.19/10 | 10,000 | 2,116 | Aug 2022 |
| 57 | uam.es | 8.19/10 | 910 | 1,945 | Aug 2022 |
| 58 | timeweb.ru | 8.18/10 | - | - | Jul 2021 |
| 59 | unige.it | 8.18/10 | 4,100 | 1,729 | Jul 2022 |
| 60 | lublin.pl | 8.17/10 | 4 | 3 | Apr 2025 |
| 61 | cyon.ch | 8.16/10 | 49 | 19 | Sep 2020 |
| 62 | pan.pl | 8.14/10 | 210 | 28 | Aug 2022 |
| 63 | verwaltungsportal.de | 8.10/10 | - | - | Mar 2020 |
| 64 | psl.eu | 8.10/10 | 5,400 | 3,246 | Apr 2020 |
| 65 | unina.it | 8.10/10 | 2,800 | 1,842 | Aug 2022 |
| 66 | websupport.sk | 8.05/10 | 32 | 25 | Aug 2018 |
| 67 | puc-rio.br | 8.05/10 | 750 | 657 | Dec 2022 |
| 68 | univ-grenoble-alpes.fr | 8.05/10 | 770 | 497 | Oct 2026 |
| 69 | poste.it | 8.04/10 | 5,700 | 3,508 | Apr 2023 |
| 70 | ui.ac.id | 8.04/10 | 190 | 21 | Nov 2022 |
| 71 | bg.ac.rs | 8.02/10 | 68 | 28 | Aug 2022 |
| 72 | mun.ca | 8.02/10 | 28,700 | 14,305 | Aug 2022 |
| 73 | zenbusiness.com | 8.01/10 | 166,800 | 58,375 | Sep 2022 |
| 74 | ntua.gr | 8.01/10 | 1,000 | 53 | Dec 2020 |
| 75 | name.com | 8.00/10 | 60,200 | 9,539 | Feb 2019 |
| 76 | locaweb.com.br | 8.00/10 | 520 | 391 | Aug 2018 |
| 77 | nestle.com | 8.00/10 | 148,600 | 51,338 | Aug 2022 |
| 78 | umk.pl | 8.00/10 | 240 | 151 | May 2022 |
| 79 | unlp.edu.ar | 7.99/10 | 960 | 1,360 | Jan 2019 |
| 80 | infn.it | 7.99/10 | 900 | 585 | Aug 2022 |
| 81 | hhu.de | 7.98/10 | 1,500 | 307 | Feb 2022 |
| 82 | ernet.in | 7.98/10 | 140 | 181 | Aug 2025 |
| 83 | active24.cz | 7.97/10 | - | 5 | Aug 2022 |
| 84 | er.ru | 7.94/10 | 9 | 22 | Aug 2022 |
| 85 | iki.fi | 7.94/10 | - | - | Nov 2023 |
| 86 | unizg.hr | 7.92/10 | 950 | 148 | Aug 2022 |
| 87 | agh.edu.pl | 7.92/10 | 170 | 121 | Aug 2018 |
| 88 | timeweb.com | 7.91/10 | 480 | 112 | Sep 2022 |
| 89 | cyberfolks.pl | 7.90/10 | 120 | 174 | Sep 2020 |
| 90 | ucr.ac.cr | 7.90/10 | 3,300 | 1,872 | Sep 2020 |
| 91 | meduniwien.ac.at | 7.89/10 | 2,000 | 1,708 | Jan 2022 |
| 92 | telenet.be | 7.87/10 | - | 1 | Nov 2025 |
| 93 | upatras.gr | 7.85/10 | 290 | 93 | Aug 2018 |
| 94 | forth.gr | 7.83/10 | 77 | 61 | May 2022 |
| 95 | lip6.fr | 7.81/10 | 100 | 49 | Jun 2021 |
| 96 | bme.hu | 7.81/10 | 1,300 | 299 | Jul 2021 |
| 97 | boku.ac.at | 7.81/10 | 2,500 | 994 | Aug 2022 |
| 98 | uke.de | 7.80/10 | 890 | 725 | Jul 2021 |
| 99 | tn.gov.in | 7.79/10 | 14,700 | 1,327 | Aug 2022 |
| 100 | yourhosting.nl | 7.78/10 | 10 | 45 | Aug 2018 |
Open Page Rank is the domain's authority score (0 to 10, from the open web link graph); the list is ordered by it and covers sites seen in recent crawls. Visits and keywords are estimated US organic search figures.
Download top 10,000 as CSV (zip) →
Columns: domain, Open Page Rank, first seen, last seen, industry (from the site's own structured data, blank when none).
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