Is Amazon or Certum more popular?

Amazon is used by more websites in our catalog: 33,418 use Amazon and 579 use Certum.

Does Amazon or Certum have higher-authority sites?

Certum sites have the higher median Ahrefs Domain Rating (Amazon: 52, Certum: 55).

Is Amazon or Certum growing faster?

Between 2026-06 and 2026-07, Amazon went from 4.6% to 3.8% of all tracked sites, while Certum went from 0.08% to 0.07%. Certum is gaining ground faster in our index.

Can a site use both Amazon and Certum?

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

Where does this Amazon vs Certum 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.

Amazon vs Certum — Site Stats Database

Amazon vs Certum

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	Amazon	Certum
Websites	33,418	579
Market share	4.0%	0.07%
Share of top 10K sites	12%	0.00%
Share of top 100K sites

Rank	#4	#17

Median DR	52	55

Average DR	49	52

Median keywords	1,413	396

Median referring domains	960	1,388

Median domain age	18 yrs	15 yrs

Average domain age	18 yrs	15 yrs

Average monthly traffic	478,363	15,804

Combined monthly traffic	15,985,918,265	9,150,719

imdb.com
LanguageEnglish
DR (Ahrefs)94
Total Keywords12,598,022
Referring Domains947,689
Domain Age30 yrs
Traffic (Jun 2026)2,387,444,775
Traffic Trend
TechnologyAmazon
merriam-webster.com
LanguageEnglish
DR (Ahrefs)91
Total Keywords4,579,269
Referring Domains240,838
Domain Age27 yrs
Traffic (Jun 2026)1,467,281,883
Traffic Trend
Technology
tripadvisor.com
Language
DR (Ahrefs)93
Total Keywords19,082,439
Referring Domains616,832
Domain Age27 yrs
Traffic (Jun 2026)1,109,161,006
Traffic Trend
Technology
britannica.com
LanguageEnglish
DR (Ahrefs)92
Total Keywords9,553,813
Referring Domains512,902
Domain Age31 yrs
Traffic (Jun 2026)511,620,010
Traffic Trend
Technology
zillow.com
LanguageEnglish
DR (Ahrefs)92
Total Keywords4,129,056
Referring Domains181,223
Domain Age21 yrs
Traffic (Jun 2026)275,243,255
Traffic Trend
Technology
mapquest.com
LanguageEnglish
DR (Ahrefs)91
Total Keywords26,333,561
Referring Domains116,999
Domain Age30 yrs
Traffic (Jun 2026)253,392,926
Traffic Trend
Technology
healthline.com
LanguageEnglish
DR (Ahrefs)92
Total Keywords7,041,614
Referring Domains458,961
Domain Age21 yrs
Traffic (Jun 2026)220,346,497
Traffic Trend
Technology
ck12.org
Language
DR (Ahrefs)75
Total Keywords1,559,871
Referring Domains17,813
Domain Age19 yrs
Traffic (Jun 2026)197,520,503
Traffic Trend
TechnologyAmazon
realtor.com
Language
DR (Ahrefs)91
Total Keywords3,586,966
Referring Domains110,593
Domain Age30 yrs
Traffic (Jun 2026)136,568,033
Traffic Trend
Technology
istockphoto.com
LanguageEnglish
DR (Ahrefs)91
Total Keywords4,131,936
Referring Domains1,685,041
Domain Age26 yrs
Traffic (Jun 2026)127,970,606
Traffic Trend
Technology

Website	Language	DR (Ahrefs)	Total Keywords	Referring Domains	Domain Age	Traffic (Jun 2026)	Traffic Trend	Technology
imdb.com	English	94	12,598,022	947,689	30 yrs	2,387,444,775		Amazon

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