Bringing Big Data to SEO Professionals - Ahrefs

Ahrefs by the numbers

The Ahrefs team takes great pride in collecting, processing and storing large amounts of data for search marketing professionals.

We crawl the entire web 24/7 (much like search engines do) storing petabytes of information about live websites — how they link to each other and what keywords they rank for in search results.

We process large amounts of clickstream data to maintain the world's largest third-party database of search queries, with estimated monthly search volume and advanced keyword research metrics.

We're proud of our backend infrastructure. All existing solutions couldn't keep up with the volume of data that we operate, so we had to custom build the larger part of our software infrastructure in-house.

3103 Servers

  • 370K CPU cores
  • 2.7PB RAM
  • 51PB HDD
  • 242PB SSD

Content index

Our content index is basically a mini search engine. You can search for any word and we'll return all the pages mentioning that word with our useful SEO metrics attached to them.

  • Every 24 hours we discover
    30 million new pages
  • Every 24 hours we update metrics for
    420 million pages
  • Total content index size
    10 billion pages

Keyword index

Keyword index is a huge database of search queries (across 10 different search engines) that you can browse and research what your prospective customers are looking for online.

19.2 billion keywords. 10 search engines. 243 countries.

  • Google
    17 B
  • YouTube
    1.3 B
  • Yahoo
    261 M
  • Amazon
    232 M
  • Yandex
    170 M
  • Bing
    157 M
  • Naver
    33 M
  • Seznam
    14 M
  • Baidu
    5.7 M
  • Daum
    3.3 M

19.2 billion keywords

  • 4.5 B United States
  • 827 M Brazil
  • 616 M United Kingdom
  • 552 M France
  • 473 M India
  • 445 M Germany
  • 384 M Canada
  • 354 M Spain
  • 341 M Russian Federation
  • 322 M Mexico
  • 319 M Italy
  • 315 M Poland
  • 290 M Japan
  • 282 M Indonesia
  • 270 M Australia
  • 268 M Argentina
  • 235 M Philippines
  • 219 M Colombia
  • 215 M Turkey
  • 196 M Vietnam
  • 193 M Ukraine
  • 175 M Netherlands
  • 166 M Malaysia
  • 162 M Thailand
  • 143 M Taiwan
  • 132 M Korea
  • 132 M Chile
  • 126 M Belgium
  • 124 M Peru
  • 123 M Pakistan
  • 113 M South Africa
  • 112 M Sweden
  • 106 M Czechia
  • 104 M Egypt
  • 102 M Switzerland
  • 97 M Singapore
  • 96 M Venezuela
  • 94 M Romania
  • 93 M Ecuador
  • 90 M United Arab Emirates
  • 89 M Greece
  • 88 M Saudi Arabia
  • 87 M Austria
  • 82 M Hungary
  • 82 M Portugal
  • 81 M Morocco
  • 79 M Bangladesh
  • 77 M Ireland
  • 76 M Algeria
  • 73 M Finland
  • 73 M New Zealand
  • 69 M Hong Kong
  • 68 M Norway
  • 66 M Denmark
  • 59 M Israel
  • 57 M Serbia
  • 53 M Nigeria
  • 52 M Kazakhstan
  • 51 M Bulgaria
  • 48 M Dominican Republic
  • 47 M Belarus
  • 46 M Slovakia
  • 44 M Bolivia
  • 41 M Sri Lanka
  • 39 M Croatia
  • 39 M Iraq
  • 38 M Tunisia
  • 38 M Guatemala
  • 37 M Costa Rica
  • 37 M Kenya
  • 35 M Nepal
  • 34 M Lithuania
  • 33 M Uruguay
  • 29 M Panama
  • 29 M Jordan
  • 27 M Palestinian Territory
  • 26 M Paraguay
  • 25 M Slovenia
  • 25 M Latvia
  • 25 M Georgia
  • 25 M Qatar
  • 24 M Honduras
  • 24 M El Salvador
  • 24 M Kuwait
  • 24 M Puerto Rico
  • 24 M Lebanon
  • 23 M Azerbaijan
  • 23 M Cambodia
  • 23 M Ghana
  • 22 M China
  • 21 M Bosnia & Herzegovina
  • 20 M Moldova
  • 20 M Estonia
  • 18 M Uzbekistan
  • 18 M Trinidad And Tobago
  • 18 M Oman
  • 18 M Jamaica
  • 16 M Cyprus
  • 15 M Myanmar
  • 15 M Armenia
  • 15 M Bahrain
  • 14 M Nicaragua
  • 14 M Albania
  • 14 M Luxembourg
  • 13 M Libya
  • 13 M North Macedonia
  • 13 M Ethiopia
  • 13 M Syrian Arab Republic
  • 12 M Kyrgyzstan
  • 12 M Mauritius
  • 12 M Yemen
  • 12 M Uganda
  • 11 M Tanzania
  • 11 M Sudan
  • 10 M Malta
  • 10 M Reunion
  • 9.6 M Cameroon
  • 9.5 M Cuba
  • 9.5 M Mongolia
  • 9.2 M Côte d'Ivoire
  • 8.9 M Zimbabwe
  • 8.7 M Zambia
  • 8.5 M Senegal
  • 7.2 M Afghanistan
  • 7 M Laos
  • 7 M Iceland
  • 6.8 M Brunei Darussalam
  • 6.6 M Angola
  • 6.6 M Turkmenistan
  • 6.2 M Montenegro
  • 5.9 M Bahamas
  • 5.9 M Madagascar
  • 5.9 M Congo, Democratic Republic
  • 5.6 M Maldives
  • 5.5 M Mozambique
  • 5.5 M Namibia
  • 5.1 M Haiti
  • 4.8 M Guadeloupe
  • 4.7 M Botswana
  • 4.6 M Martinique
  • 4.4 M Guyana
  • 4.2 M Macao
  • 4 M Tajikistan
  • 3.9 M Belize
  • 3.8 M Somalia
  • 3.5 M Fiji
  • 3.5 M Rwanda
  • 3.5 M Guam
  • 3.5 M Benin
  • 3.3 M Suriname
  • 3 M Mali
  • 2.9 M Gabon
  • 2.9 M Malawi
  • 2.9 M Togo
  • 2.8 M Papua New Guinea
  • 2.7 M Burkina Faso
  • 2.6 M Bhutan
  • 2.4 M Mauritania
  • 2.4 M New Caledonia
  • 2.3 M Jersey
  • 2.2 M French Polynesia
  • 2.1 M French Guiana
  • 2.1 M Swaziland
  • 2.1 M Isle Of Man
  • 2 M Saint Lucia
  • 2 M Congo
  • 2 M Guinea
  • 1.9 M Aruba
  • 1.9 M Lesotho
  • 1.8 M Sierra Leone
  • 1.7 M Andorra
  • 1.7 M Cayman Islands
  • 1.7 M Antigua And Barbuda
  • 1.7 M Niger
  • 1.7 M Seychelles
  • 1.6 M Cape Verde
  • 1.5 M Bermuda
  • 1.5 M Liberia
  • 1.5 M Grenada
  • 1.5 M Virgin Islands, U.S.
  • 1.5 M Guernsey
  • 1.3 M Gambia
  • 1.2 M Saint Vincent And Grenadines
  • 1.1 M Faroe Islands
  • 1 M Virgin Islands, British
  • 1 M Mayotte
  • 1 M Liechtenstein
  • 1 M Timor-Leste
  • 980 K Greenland
  • 977 K Gibraltar
  • 964 K Saint Kitts And Nevis
  • 953 K Djibouti
  • 940 K Chad
  • 898 K Monaco
  • 837 K Burundi
  • 823 K Dominica
  • 776 K Aland Islands
  • 726 K Turks And Caicos Islands
  • 646 K San Marino
  • 581 K Northern Mariana Islands
  • 541 K Equatorial Guinea
  • 419 K Samoa
  • 408 K American Samoa
  • 401 K Solomon Islands
  • 384 K Western Sahara
  • 368 K Vanuatu
  • 358 K Central African Republic
  • 356 K Sao Tome And Principe
  • 345 K Guinea-Bissau
  • 332 K Comoros
  • 313 K Saint Martin
  • 292 K Anguilla
  • 257 K Tonga
  • 202 K Micronesia, Federated States Of
  • 199 K Palau
  • 184 K Saint Barthelemy
  • 160 K Cook Islands
  • 148 K Kiribati
  • 138 K Marshall Islands
  • 133 K Eritrea
  • 94 K Svalbard And Jan Mayen
  • 90 K Nauru
  • 77 K Saint Pierre And Miquelon
  • 61 K Montserrat
  • 54 K Falkland Islands (Malvinas)
  • 36 K Saint Helena
  • 26 K Wallis And Futuna
  • 22 K Antarctica
  • 16 K British Indian Ocean Territory
  • 16 K Norfolk Island
  • 15 K Christmas Island
  • 14 K Tuvalu
  • 9 K Niue
  • 2.2 K Tokelau
  • 689 United States Outlying Islands
  • 9 Cocos (Keeling) Islands
  • 6 South Georgia And Sandwich Isl.
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Search traffic index

Search Traffic index is a database of search queries that we use to approximate the search traffic that any website or URL has, and show you the actual keywords that it ranks for.

508 million keywords. 189 countries

  • 148 M United States
  • 31 M India
  • 28 M Japan
  • 22 M United Kingdom
  • 19 M Germany
  • 15 M France
  • 14 M Indonesia
  • 13 M Canada
  • 13 M Australia
  • 12 M Turkey
  • 12 M Italy
  • 12 M Brazil
  • 11 M Mexico
  • 10 M Spain
  • 9.2 M Poland
  • 9.1 M Russian Federation
  • 6.9 M Thailand
  • 6.8 M Vietnam
  • 6.6 M Netherlands
  • 6 M Philippines
  • 5.4 M Ukraine
  • 5 M Argentina
  • 4.5 M Colombia
  • 3.9 M Sweden
  • 3.5 M Taiwan
  • 3.3 M Malaysia
  • 3 M South Africa
  • 2.9 M Chile
  • 2.8 M Saudi Arabia
  • 2.6 M Peru
  • 2.6 M Egypt
  • 2.5 M Belgium
  • 2.5 M Pakistan
  • 2.2 M Denmark
  • 2.2 M Austria
  • 2.1 M Greece
  • 2.1 M Romania
  • 2 M Czechia
  • 1.9 M Singapore
  • 1.9 M Switzerland
  • 1.9 M Israel
  • 1.9 M Korea
  • 1.8 M Hungary
  • 1.6 M Hong Kong
  • 1.6 M Finland
  • 1.6 M Nigeria
  • 1.6 M Portugal
  • 1.6 M Norway
  • 1.5 M Ireland
  • 1.4 M United Arab Emirates
  • 1.4 M New Zealand
  • 1.3 M Bangladesh
  • 1.2 M Ecuador
  • 1.1 M Venezuela
  • 1.1 M Algeria
  • 971 K Morocco
  • 969 K Kazakhstan
  • 942 K Slovakia
  • 900 K Bulgaria
  • 842 K Serbia
  • 702 K Croatia
  • 690 K Belarus
  • 681 K Kenya
  • 652 K Sri Lanka
  • 632 K Iraq
  • 586 K Guatemala
  • 564 K Bolivia
  • 529 K Dominican Republic
  • 485 K Lithuania
  • 484 K Nepal
  • 474 K Costa Rica
  • 420 K Uruguay
  • 413 K Jordan
  • 409 K Ghana
  • 406 K Tunisia
  • 350 K Panama
  • 334 K Azerbaijan
  • 326 K Paraguay
  • 322 K Kuwait
  • 317 K Slovenia
  • 302 K Uzbekistan
  • 301 K Puerto Rico
  • 275 K Honduras
  • 273 K El Salvador
  • 249 K Bosnia & Herzegovina
  • 246 K Qatar
  • 245 K Lebanon
  • 229 K Estonia
  • 228 K Latvia
  • 220 K Oman
  • 206 K Georgia
  • 204 K Tanzania
  • 185 K Uganda
  • 181 K Moldova
  • 174 K Kyrgyzstan
  • 168 K China
  • 167 K Nicaragua
  • 166 K Cyprus
  • 159 K Myanmar
  • 157 K Jamaica
  • 153 K Côte d'Ivoire
  • 138 K Zambia
  • 138 K Libya
  • 137 K Armenia
  • 137 K Cambodia
  • 134 K Cameroon
  • 131 K Ethiopia
  • 129 K Bahrain
  • 128 K Senegal
  • 125 K Palestinian Territory
  • 122 K Trinidad And Tobago
  • 121 K Congo, Democratic Republic
  • 119 K North Macedonia
  • 112 K Albania
  • 103 K Luxembourg
  • 96 K Zimbabwe
  • 95 K Mauritius
  • 91 K Malta
  • 89 K Angola
  • 79 K Mozambique
  • 72 K Mongolia
  • 66 K Montenegro
  • 63 K Laos
  • 61 K Turkmenistan
  • 60 K Haiti
  • 59 K Iceland
  • 57 K Afghanistan
  • 52 K Namibia
  • 49 K Cuba
  • 46 K Guadeloupe
  • 45 K Burkina Faso
  • 45 K Tajikistan
  • 42 K Mali
  • 42 K Brunei Darussalam
  • 40 K Benin
  • 39 K Somalia
  • 38 K Madagascar
  • 38 K Botswana
  • 37 K Maldives
  • 33 K Rwanda
  • 29 K Bahamas
  • 29 K Guyana
  • 28 K Fiji
  • 27 K Gabon
  • 25 K Togo
  • 23 K Suriname
  • 22 K Papua New Guinea
  • 20 K Bhutan
  • 20 K Malawi
  • 18 K Belize
  • 17 K Gibraltar
  • 16 K Congo
  • 16 K Niger
  • 16 K Sierra Leone
  • 13 K Lesotho
  • 10 K Jersey
  • 8.7 K Cape Verde
  • 8.3 K Isle Of Man
  • 8.1 K Chad
  • 7.9 K Andorra
  • 7.1 K Gambia
  • 6.9 K Virgin Islands, U.S.
  • 5.7 K Antigua And Barbuda
  • 5.7 K Timor-Leste
  • 5.3 K Saint Vincent And Grenadines
  • 4.8 K Guernsey
  • 4.6 K Seychelles
  • 4.4 K Burundi
  • 3.9 K Djibouti
  • 2.8 K Central African Republic
  • 2.8 K Greenland
  • 2.4 K Liechtenstein
  • 2 K Virgin Islands, British
  • 1.8 K San Marino
  • 1.6 K Dominica
  • 1.4 K Sao Tome And Principe
  • 504 Solomon Islands
  • 433 American Samoa
  • 424 Vanuatu
  • 400 Samoa
  • 289 Anguilla
  • 212 Tonga
  • 177 Cook Islands
  • 169 Micronesia, Federated States Of
  • 111 Kiribati
  • 102 Nauru
  • 41 Montserrat
  • 24 Niue
  • 21 Saint Helena
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