Is Certification or Learning bigger?

Learning has more websites in our catalog: 1,576 are Certification and 6,414 are Learning.

Which has higher-authority sites, Certification or Learning?

Certification has the higher median Ahrefs Domain Rating (Certification: 44, Learning: 36).

How many sites are in both Certification and Learning?

118 websites in our catalog match both.

Where does this data come from?

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

Certification vs Learning Websites — Site Stats Database

Certification vs Learning

A side-by-side comparison of two topics, based on the 578,597 websites Site Stats Database classifies into a topic.

Last updated July 1, 2026

Metric	Certification	Learning
Websites	1,576	6,414
Market share	0.3%	1.1%
Rank	#296	#48
Median DR	44	36
Average DR

Median keywords	1,578	1,459

Median referring domains	721	624

Median domain age	15 yrs	12 yrs

Average domain age	16 yrs	14 yrs

Combined monthly traffic	104,805,691	1,413,657,406

Average monthly traffic	66,501	220,402

aapc.com
LanguageEnglish
DR (Ahrefs)79
Total Keywords282,781
Referring Domains11,910
Domain Age29 yrs
Traffic (Jun 2026)11,747,563
Traffic Trend
TopicCertification
nasm.org
LanguageEnglish
DR (Ahrefs)81
Total Keywords134,879
Referring Domains14,606
Domain Age29 yrs
Traffic (Jun 2026)5,395,641
Traffic Trend
TopicCertification
acefitness.org
LanguageEnglish
DR (Ahrefs)84
Total Keywords83,750
Referring Domains27,212
Domain Age30 yrs
Traffic (Jun 2026)4,558,823
Traffic Trend
TopicCertification
corporatefinanceinstitute.com
LanguageEnglish
DR (Ahrefs)86
Total Keywords452,545
Referring Domains63,109
Domain Age10 yrs
Traffic (Jun 2026)3,822,169
Traffic Trend
Topic
asq.org
LanguageEnglish
DR (Ahrefs)83
Total Keywords37,008
Referring Domains18,447
Domain Age29 yrs
Traffic (Jun 2026)2,331,650
Traffic Trend
TopicCertification
padi.com
LanguageEnglish
DR (Ahrefs)85
Total Keywords56,164
Referring Domains25,167
Domain Age31 yrs
Traffic (Jun 2026)1,865,973
Traffic Trend
TopicCertification
aba.com
LanguageEnglish
DR (Ahrefs)83
Total Keywords38,508
Referring Domains18,385
Domain Age32 yrs
Traffic (Jun 2026)1,848,445
Traffic Trend
TopicCertification
dovesfarm.co.uk
LanguageEnglish
DR (Ahrefs)57
Total Keywords15,573
Referring Domains2,800
Domain Age27 yrs
Traffic (Jun 2026)1,752,380
Traffic Trend
TopicCertification
kworb.net
LanguageEnglish
DR (Ahrefs)59
Total Keywords111,402
Referring Domains5,745
Domain Age19 yrs
Traffic (Jun 2026)1,400,044
Traffic Trend
TopicCertification
nachi.org
LanguageEnglish
DR (Ahrefs)87
Total Keywords102,462
Referring Domains23,036
Domain Age26 yrs
Traffic (Jun 2026)1,383,633
Traffic Trend
TopicCertification

Website	Language	DR (Ahrefs)	Total Keywords	Referring Domains	Domain Age	Traffic (Jun 2026)	Traffic Trend	Topic
aapc.com	English	79	282,781	11,910	29 yrs	11,747,563		Certification

unitconverters.net
LanguageEnglish
DR (Ahrefs)74
Total Keywords462,113
Referring Domains5,885
Domain Age18 yrs
Traffic (Jun 2026)216,506,436
Traffic Trend
TopicLearning
harvard.edu
LanguageEnglish
DR (Ahrefs)93
Total Keywords3,845,102
Referring Domains714,396
Domain Age41 yrs
Traffic (Jun 2026)104,117,233
Traffic Trend
TopicLearning
byjus.com
LanguageEnglish
DR (Ahrefs)80
Total Keywords1,666,559
Referring Domains55,721
Domain Age13 yrs
Traffic (Jun 2026)65,601,851
Traffic Trend
TopicLearning
stanford.edu
LanguageEnglish
DR (Ahrefs)92
Total Keywords1,198,840
Referring Domains511,286
Domain Age40 yrs
Traffic (Jun 2026)45,915,915
Traffic Trend
TopicLearning
geeksforgeeks.org
LanguageEnglish
DR (Ahrefs)89
Total Keywords1,877,851
Referring Domains83,223
Domain Age17 yrs
Traffic (Jun 2026)36,443,558
Traffic Trend
TopicLearning
coolmathgames.com
LanguageEnglish
DR (Ahrefs)76
Total Keywords78,383
Referring Domains11,329
Domain Age24 yrs
Traffic (Jun 2026)31,575,188
Traffic Trend
TopicLearning
brainly.com
LanguageEnglish
DR (Ahrefs)71
Total Keywords1,527,163
Referring Domains10,770
Domain Age21 yrs
Traffic (Jun 2026)25,945,528
Traffic Trend
TopicLearning
blooket.com
LanguageEnglish
DR (Ahrefs)75
Total Keywords6,757
Referring Domains5,504
Domain Age7 yrs
Traffic (Jun 2026)21,935,667
Traffic Trend
TopicLearning
w3schools.com
LanguageEnglish
DR (Ahrefs)92
Total Keywords460,584
Referring Domains130,164
Domain Age26 yrs
Traffic (Jun 2026)19,645,294
Traffic Trend
TopicLearning
education.nationalgeographic.org
LanguageEnglish
DR (Ahrefs)88
Total Keywords447,479
Referring Domains35,681
Domain Age27 yrs
Traffic (Jun 2026)19,235,982
Traffic Trend
Topic