Is Certainly or Hellenic Academic and Research Institutions CA more popular?

Hellenic Academic and Research Institutions CA is used by more websites in our catalog: 776 use Certainly and 1,161 use Hellenic Academic and Research Institutions CA.

Does Certainly or Hellenic Academic and Research Institutions CA have higher-authority sites?

Hellenic Academic and Research Institutions CA sites have the higher median Ahrefs Domain Rating (Certainly: 63, Hellenic Academic and Research Institutions CA: 75).

Can a site use both Certainly and Hellenic Academic and Research Institutions CA?

No. A site runs a single SSL certificate authority, so Certainly and Hellenic Academic and Research Institutions CA are mutually exclusive.

Certainly vs Hellenic Academic and Research Institutions CA — Site Stats Database

Certainly vs Hellenic Academic and Research Institutions CA

Q: Is Certainly or Hellenic Academic and Research Institutions CA growing faster?

Between 2026-06 and 2026-07, Certainly went from 0.12% to 0.09% of all tracked sites, while Hellenic Academic and Research Institutions CA went from 0.17% to 0.13%. Certainly is gaining ground faster in our index.

Q: Where does this Certainly vs Hellenic Academic and Research Institutions CA 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.

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	Certainly	Hellenic Academic and Research Institutions CA
Websites	776	1,161
Market share	0.09%	0.14%
Share of top 10K sites	0.67%

Share of top 100K sites	0.21%	0.06%

Rank	#14	#11

Median DR	63	75

Average DR	58	74

Median keywords	1,634	658

Median referring domains	1,209	5,129

Median domain age	23 yrs	26 yrs

Average domain age	20 yrs	24 yrs

Average monthly traffic	695,346	13,566

Combined monthly traffic	539,588,145	15,749,601

akc.org
LanguageEnglish
DR (Ahrefs)90
Total Keywords655,094
Referring Domains78,973
Domain Age31 yrs
Traffic (Jun 2026)125,727,029
Traffic Trend
TechnologyCertainly
wikihow.com
LanguageEnglish
DR (Ahrefs)91
Total Keywords5,580,639
Referring Domains404,808
Domain Age22 yrs
Traffic (Jun 2026)43,976,309
Traffic Trend
Technology
ubiehealth.com
LanguageEnglish
DR (Ahrefs)62
Total Keywords519,101
Referring Domains2,750
Domain Age4 yrs
Traffic (Jun 2026)31,668,228
Traffic Trend
Technology
ufc.com
LanguageEnglish
DR (Ahrefs)81
Total Keywords103,879
Referring Domains28,384
Domain Age31 yrs
Traffic (Jun 2026)18,875,616
Traffic Trend
TechnologyCertainly
bible.com
LanguageEnglish
DR (Ahrefs)90
Total Keywords681,273
Referring Domains50,220
Domain Age31 yrs
Traffic (Jun 2026)17,974,483
Traffic Trend
TechnologyCertainly
bathandbodyworks.com
LanguageEnglish
DR (Ahrefs)77
Total Keywords89,451
Referring Domains23,742
Domain Age28 yrs
Traffic (Jun 2026)16,958,001
Traffic Trend
Technology
time.com
LanguageEnglish
DR (Ahrefs)92
Total Keywords1,667,220
Referring Domains590,607
Domain Age32 yrs
Traffic (Jun 2026)15,941,582
Traffic Trend
TechnologyCertainly
aad.org
LanguageEnglish
DR (Ahrefs)90
Total Keywords359,999
Referring Domains56,366
Domain Age30 yrs
Traffic (Jun 2026)15,847,168
Traffic Trend
TechnologyCertainly
yale.edu
LanguageEnglish
DR (Ahrefs)91
Total Keywords637,409
Referring Domains270,573
Domain Age39 yrs
Traffic (Jun 2026)14,257,045
Traffic Trend
TechnologyCertainly
arizona.edu
LanguageEnglish
DR (Ahrefs)90
Total Keywords497,891
Referring Domains140,110
Domain Age40 yrs
Traffic (Jun 2026)9,982,834
Traffic Trend
Technology

Website	Language	DR (Ahrefs)	Total Keywords	Referring Domains	Domain Age	Traffic (Jun 2026)	Traffic Trend	Technology
akc.org	English	90	655,094	78,973	31 yrs	125,727,029		Certainly

mpg.de
LanguageGerman
DR (Ahrefs)89
Total Keywords61,365
Referring Domains103,616
Domain Age
Traffic (Jun 2026)560,707
Traffic Trend
TechnologyHellenic Academic and Research Institutions CA
ucm.es
LanguageSpanish
DR (Ahrefs)84
Total Keywords21,955
Referring Domains58,616
Domain Age
Traffic (Jun 2026)520,587
Traffic Trend
TechnologyHellenic Academic and Research Institutions CA
eso.org
LanguageEnglish
DR (Ahrefs)82
Total Keywords18,717
Referring Domains32,647
Domain Age35 yrs
Traffic (Jun 2026)398,404
Traffic Trend
TechnologyHellenic Academic and Research Institutions CA
cun.es
LanguageSpanish
DR (Ahrefs)75
Total Keywords72,981
Referring Domains9,254
Domain Age
Traffic (Jun 2026)394,191
Traffic Trend
TechnologyHellenic Academic and Research Institutions CA
hal.science
LanguageEnglish
DR (Ahrefs)85
Total Keywords68,893
Referring Domains58,817
Domain Age
Traffic (Jun 2026)357,126
Traffic Trend
Technology
belgium.be
LanguageEnglish
DR (Ahrefs)90
Total Keywords12,117
Referring Domains64,675
Domain Age31 yrs
Traffic (Jun 2026)290,046
Traffic Trend
Technology
astro4edu.org
LanguageEnglish
DR (Ahrefs)48
Total Keywords15,128
Referring Domains1,030
Domain Age6 yrs
Traffic (Jun 2026)262,741
Traffic Trend
Technology
plantnet.org
LanguageEnglish
DR (Ahrefs)74
Total Keywords11,086
Referring Domains7,165
Domain Age12 yrs
Traffic (Jun 2026)234,714
Traffic Trend
Technology
bund.de
LanguageEnglish
DR (Ahrefs)94
Total Keywords99,279
Referring Domains462,466
Domain Age
Traffic (Jun 2026)224,202
Traffic Trend
TechnologyHellenic Academic and Research Institutions CA
habsburger.net
LanguageGerman
DR (Ahrefs)63
Total Keywords6,739
Referring Domains3,814
Domain Age17 yrs
Traffic (Jun 2026)188,745
Traffic Trend
Technology