Is Certum or InCommon, LLC more popular?

Certum is used by more websites in our catalog: 579 use Certum and 110 use InCommon, LLC.

Does Certum or InCommon, LLC have higher-authority sites?

InCommon, LLC sites have the higher median Ahrefs Domain Rating (Certum: 55, InCommon, LLC: 73).

Is Certum or InCommon, LLC growing faster?

Between 2026-06 and 2026-07, Certum went from 0.08% to 0.07% of all tracked sites, while InCommon, LLC went from 0.02% to 0.01%. InCommon, LLC is gaining ground faster in our index.

Can a site use both Certum and InCommon, LLC?

No. A site runs a single SSL certificate authority, so Certum and InCommon, LLC are mutually exclusive.

Where does this Certum vs InCommon, LLC data come from?

Adoption is counted from Site Stats Database's own crawl; Domain Rating comes from Ahrefs and traffic from DataForSEO. Figures reflect the sites we track and refresh at least monthly.

Certum vs InCommon, LLC — Site Stats Database

Certum vs InCommon, LLC

A side-by-side comparison of two ssl certificate authorities, based on the 842,065 SSL Authority sites tracked by Site Stats Database.

Last updated July 1, 2026

Metric	Certum	InCommon, LLC
Websites	579	110
Market share	0.07%	0.01%
Share of top 10K sites	0.00%	0.17%

Rank	#17	#34

Median DR	55	73

Average DR	52	68

Median keywords	396	3,920

Median referring domains	1,388	2,014

Median domain age	15 yrs	33 yrs

Average domain age	15 yrs	30 yrs

Average monthly traffic	15,804	1,275,880

Combined monthly traffic	9,150,719	140,346,847

auschwitz.org
LanguagePolish
DR (Ahrefs)76
Total Keywords9,509
Referring Domains11,787
Domain Age25 yrs
Traffic (Jun 2026)703,253
Traffic Trend
TechnologyCertum
simcosplay.com
LanguageEnglish
DR (Ahrefs)21
Total Keywords20,259
Referring Domains1,668
Domain Age7 yrs
Traffic (Jun 2026)683,447
Traffic Trend
Technology
uhomes.com
LanguageEnglish
DR (Ahrefs)55
Total Keywords119,316
Referring Domains2,552
Domain Age23 yrs
Traffic (Jun 2026)570,251
Traffic Trend
Technology
abadis.ir
LanguagePersian
DR (Ahrefs)70
Total Keywords110,449
Referring Domains6,192
Domain Age
Traffic (Jun 2026)490,697
Traffic Trend
TechnologyCertum
floorplancreator.net
LanguageEnglish
DR (Ahrefs)42
Total Keywords4,628
Referring Domains987
Domain Age13 yrs
Traffic (Jun 2026)460,176
Traffic Trend
Technology
anchenggy.com
LanguageEnglish
DR (Ahrefs)27
Total Keywords6,466
Referring Domains619
Domain Age12 yrs
Traffic (Jun 2026)332,303
Traffic Trend
Technology
igmetall.de
LanguageGerman
DR (Ahrefs)75
Total Keywords306
Referring Domains9,381
Domain Age
Traffic (Jun 2026)310,727
Traffic Trend
TechnologyCertum
mywanderlust.pl
LanguageEnglish
DR (Ahrefs)47
Total Keywords9,706
Referring Domains2,952
Domain Age13 yrs
Traffic (Jun 2026)283,835
Traffic Trend
Technology
scirp.org
LanguageEnglish
DR (Ahrefs)86
Total Keywords90,804
Referring Domains62,358
Domain Age18 yrs
Traffic (Jun 2026)272,944
Traffic Trend
TechnologyCertum
mfa.gov.ir
Language
DR (Ahrefs)72
Total Keywords3,297
Referring Domains5,427
Domain Age
Traffic (Jun 2026)267,826
Traffic Trend
TechnologyCertum

Website	Language	DR (Ahrefs)	Total Keywords	Referring Domains	Domain Age	Traffic (Jun 2026)	Traffic Trend	Technology
auschwitz.org	Polish	76	9,509	11,787	25 yrs	703,253		Certum

purdue.edu
LanguageEnglish
DR (Ahrefs)90
Total Keywords877,227
Referring Domains170,898
Domain Age41 yrs
Traffic (Jun 2026)37,101,645
Traffic Trend
TechnologyInCommon, LLC
ncsu.edu
LanguageEnglish
DR (Ahrefs)90
Total Keywords774,707
Referring Domains123,047
Domain Age39 yrs
Traffic (Jun 2026)20,038,787
Traffic Trend
TechnologyInCommon, LLC
rochester.edu
LanguageEnglish
DR (Ahrefs)88
Total Keywords668,671
Referring Domains98,577
Domain Age39 yrs
Traffic (Jun 2026)11,687,937
Traffic Trend
Technology
uchicago.edu
LanguageEnglish
DR (Ahrefs)91
Total Keywords465,840
Referring Domains223,232
Domain Age34 yrs
Traffic (Jun 2026)7,172,842
Traffic Trend
Technology
hort.extension.wisc.edu
LanguageEnglish
DR (Ahrefs)91
Total Keywords109,362
Referring Domains6,956
Domain Age40 yrs
Traffic (Jun 2026)5,349,514
Traffic Trend
Technology
ufhealth.org
LanguageEnglish
DR (Ahrefs)77
Total Keywords405,348
Referring Domains13,570
Domain Age13 yrs
Traffic (Jun 2026)5,056,394
Traffic Trend
Technology
iu.edu
LanguageEnglish
DR (Ahrefs)89
Total Keywords240,126
Referring Domains79,917
Domain Age29 yrs
Traffic (Jun 2026)4,352,782
Traffic Trend
TechnologyInCommon, LLC
berklee.edu
LanguageEnglish
DR (Ahrefs)81
Total Keywords73,204
Referring Domains21,365
Domain Age33 yrs
Traffic (Jun 2026)2,380,230
Traffic Trend
Technology
umass.edu
LanguageEnglish
DR (Ahrefs)88
Total Keywords172,338
Referring Domains90,948
Domain Age40 yrs
Traffic (Jun 2026)2,169,778
Traffic Trend
TechnologyInCommon, LLC
bcm.edu
LanguageEnglish
DR (Ahrefs)81
Total Keywords129,477
Referring Domains26,270
Domain Age31 yrs
Traffic (Jun 2026)1,874,650
Traffic Trend
TechnologyInCommon, LLC