Does DigiCert 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 (DigiCert: 53, Hellenic Academic and Research Institutions CA: 75).

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

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

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

DigiCert vs Hellenic Academic and Research Institutions CA

Q: Is DigiCert or Hellenic Academic and Research Institutions CA more popular?

DigiCert is used by more websites in our catalog: 35,062 use DigiCert and 1,161 use Hellenic Academic and Research Institutions CA.

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

Between 2026-06 and 2026-07, DigiCert went from 5.3% to 4.0% of all tracked sites, while Hellenic Academic and Research Institutions CA went from 0.17% to 0.13%. Hellenic Academic and Research Institutions CA is gaining ground faster in our index.

Q: Where does this DigiCert 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	DigiCert	Hellenic Academic and Research Institutions CA
Websites	35,062	1,161
Market share	4.2%	0.14%
Share of top 10K sites	13%

Share of top 100K sites	7.3%	0.06%

Rank	#3	#11

Median DR	53	75

Average DR	50	74

Median keywords	1,162	658

Median referring domains	869	5,129

Median domain age	22 yrs	26 yrs

Average domain age	21 yrs	24 yrs

Average monthly traffic	899,101	13,566

Combined monthly traffic	31,524,291,463	15,749,601

reddit.com
Language
DR (Ahrefs)95
Total Keywords108,484,703
Referring Domains1,816,031
Domain Age21 yrs
Traffic (Jun 2026)4,801,167,771
Traffic Trend
TechnologyDigiCert
facebook.com
LanguageEnglish
DR (Ahrefs)100
Total Keywords130,296,472
Referring Domains37,387,092
Domain Age29 yrs
Traffic (Jun 2026)3,317,277,661
Traffic Trend
TechnologyDigiCert
instagram.com
LanguageEnglish
DR (Ahrefs)100
Total Keywords103,652,284
Referring Domains25,257,813
Domain Age22 yrs
Traffic (Jun 2026)2,566,799,220
Traffic Trend
TechnologyDigiCert
amazon.com
LanguageEnglish
DR (Ahrefs)96
Total Keywords45,669,286
Referring Domains3,247,160
Domain Age31 yrs
Traffic (Jun 2026)2,401,671,408
Traffic Trend
TechnologyDigiCert
yelp.com
Language
DR (Ahrefs)94
Total Keywords34,240,481
Referring Domains773,122
Domain Age22 yrs
Traffic (Jun 2026)1,590,167,976
Traffic Trend
TechnologyDigiCert
pinterest.com
LanguageEnglish
DR (Ahrefs)97
Total Keywords36,716,308
Referring Domains7,554,973
Domain Age16 yrs
Traffic (Jun 2026)893,101,946
Traffic Trend
TechnologyDigiCert
yahoo.com
LanguageEnglish
DR (Ahrefs)94
Total Keywords23,561,825
Referring Domains2,118,636
Domain Age31 yrs
Traffic (Jun 2026)639,658,909
Traffic Trend
TechnologyDigiCert
rottentomatoes.com
LanguageEnglish
DR (Ahrefs)87
Total Keywords4,123,803
Referring Domains130,919
Domain Age27 yrs
Traffic (Jun 2026)626,896,769
Traffic Trend
TechnologyDigiCert
weather.com
LanguageEnglish
DR (Ahrefs)90
Total Keywords1,156,559
Referring Domains130,903
Domain Age31 yrs
Traffic (Jun 2026)560,457,254
Traffic Trend
TechnologyDigiCert
spotify.com
LanguageEnglish
DR (Ahrefs)95
Total Keywords7,485,298
Referring Domains1,649,815
Domain Age20 yrs
Traffic (Jun 2026)505,668,332
Traffic Trend
TechnologyDigiCert

Website	Language	DR (Ahrefs)	Total Keywords	Referring Domains	Domain Age	Traffic (Jun 2026)	Traffic Trend	Technology
reddit.com		95	108,484,703	1,816,031	21 yrs	4,801,167,771		DigiCert

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
TechnologyHellenic Academic and Research Institutions CA
belgium.be
LanguageEnglish
DR (Ahrefs)90
Total Keywords12,117
Referring Domains64,675
Domain Age31 yrs
Traffic (Jun 2026)290,046
Traffic Trend
TechnologyHellenic Academic and Research Institutions CA
astro4edu.org
LanguageEnglish
DR (Ahrefs)48
Total Keywords15,128
Referring Domains1,030
Domain Age6 yrs
Traffic (Jun 2026)262,741
Traffic Trend
TechnologyHellenic Academic and Research Institutions CA
plantnet.org
LanguageEnglish
DR (Ahrefs)74
Total Keywords11,086
Referring Domains7,165
Domain Age12 yrs
Traffic (Jun 2026)234,714
Traffic Trend
TechnologyHellenic Academic and Research Institutions CA
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
TechnologyHellenic Academic and Research Institutions CA