The top 500 sites on the web The sites in the top sites lists are ordered by their 1 month Alexa traffic rank.

The 1 month rank is calculated using a combination of average daily visitors and pageviews over the past month. The site with the highest combination of visitors and pageviews is ranked #1

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Site
Daily Time on Site Daily Time on Site

Estimated daily time on site (mm:ss) per visitor to the site. Updated daily based on the trailing 3 months.
Daily Pageviews per Visitor Daily Pageviews per Visitor

Estimated daily unique pageviews per visitor on the site. Updated daily based on the trailing 3 months.
% of Traffic From Search % of Traffic From Search

The percentage of all referrals that came from Search engines over the trailing month. Updated daily.
Total Sites Linking In Total Sites Linking In

The total number of sites that Alexa found that link to this site. For more information please see this explanation of how Alexa determines the number of sites linking in.
1

Translate.google.com

Traducción de texto y páginas web entre múltiples idiomas, con teclado virtual, y audio de la pMoreronunciación. Less

7:18

7.27

3.30%

3,462,044

2

Ncbi.nlm.nih.gov

National Library of Medicine / National Institutes of Health. Offers many important databases (MorePubMed, GenBank, OMIM) and some tools. Less

3:50

3.26

58.50%

197,595

3

Sciencedirect.com

An information source for scientific, technical, and medical research. Subscription required foMorer some sections. Less

2:48

2.80

40.40%

81,675

4

Researchgate.net

Social community for researchers, fostering collaboration and knowledge exchange among researchMoreers worldwide. Less

2:35

2.13

55.50%

17,698

5

Coinmarketcap.com

Ranking of cryptocurrency and assets by market cap. Details and chart for each currency.

5:17

2.83

8.80%

3,614

6

Reverso.net

Translation, dictionary, conjugation, grammar for English, French, Spanish, German, Italian, RuMoressian, Chinese, Arabic, Japanese, Hebrew, Polish, Dutch ... Less

5:56

3.59

57.10%

8,030

7

Urbandictionary.com

A veritable cornucopia of streetwise lingo, posted and defined by its readers.

1:47

1.12

81.70%

36,479

8

Elsevier.com

elsevier.com is the web resource for the publishing house Elsevier, specializing in scientific,More technical and medical information. Find all products, support and contacts, and information about the company. Less

2:27

2.28

24.70%

24,604

9

Autodesk.com

Finite element analysis and mechanical event simulation software for virtual prototyping. This Morewas formerly Algor. Less

3:59

3.54

45.80%

23,039

10

Ieee.org

To help engineer and technical communicators develop skills in written and oral presentation.

3:34

2.98

43.30%

37,503

11

Nature.com

Nature.com provides access to all Nature Publishing Group journals, online databases and servicMorees, including Nature News, and the social network for scientists Nature Network. Nature Publishing Group publishes products across the life, physical and applied sciences and clinical medicine. Nature.com hosts more than 70 journals, including Nature . The site also include Nature Jobs, which features access to job listings, editorial content about scientific careers and other information. Less

2:34

2.51

38.90%

84,434

12

Timeanddate.com

Yearly and monthly calendars, countdown counters and the world clock which shows current time iMoren cities all over the world Less

2:06

1.53

58.00%

23,074

13

Duolingo.com

Offers free language instruction where users translate documents and vote on the accuracy of thMoreose translations. Contains a description of how it works, a blog, and a study of the project's efficacy. Less

3:06

1.82

17.40%

3,319

14

Arxiv.org

Fully automated electronic archive and distribution server for research papers, hosted at the LMoreos Alamos National Laboratory. Less

2:50

2.69

39.80%

27,954

15

Weather.gov

Official U.S. weather, marine, fire and aviation forecasts, warnings, meteorological products, Moreclimate forecasts and information about meteorology. Less

2:40

2.23

9.20%

31,290

16

Acs.org

Primary professional organization for chemists and related occupations.

3:22

3.53

42.20%

24,710

17

Jma.go.jp

気象の情報とデータ集。日々の天気図やその解説、台風や地震、火山の情報があるよ。

2:41

3.50

20.10%

9,445

18

Mathworks.com

Developers of MATLAB, Simulink and Stateflow. The MathWorks offers a set of integrated productsMore for data analysis, visualization, application development, simulation, model-based design, and code generation. Less

6:03

4.42

66.50%

9,306

19

Ted.com

TED (Technology, Entertainment, Design) is an invitation-only event where the world's leading tMorehinkers and doers gather to find inspiration. Initially an annual conference, the scope of TED has expanded to include a bi-annual global conference, a humanitarian prize, and free audio/video podcasts of extraordinary talks. Less

3:05

2.36

28.80%

72,945

20

Mayoclinic.org

Clinical experts provide current medical information and news on health topics.

2:11

1.36

76.40%

26,584

21

Berkeley.edu

Official Site.

3:52

3.87

38.20%

80,968

22

Noaa.gov

an organization of the U.S. Department of Commerce. NOAA warns of dangerous weather, charts ourMore seas and skies, guides our use and protection of ocean and coastal resources, and conducts research to improve our understanding and stewardship of the environment which sustains us all. Less

3:01

2.53

23.50%

70,342

23

Jstor.org

Scans of print journals, with 10 major math journals (requires subscription).

2:44

2.46

45.50%

33,117

24

Nationalgeographic.com

With a look into the pages of the magazine, plus interactive features, maps, photography, news,More exhibitions, things for kids, educational features, and hosting live events. Searchable web site. Less

2:44

1.82

37.70%

93,673

25

Howstuffworks.com

HowStuffWorks.com is an award winning site covering thousands of topics within its own 10 channMoreels: Auto, Computer, Electronics, Entertainment, Health, Home, Money, People, Science and Travel. Less

2:40

1.81

51.90%

46,002

26

Economist.com

Authoritative weekly newspaper focusing on international politics and business news and opinion.. Less

2:23

1.67

30.90%

57,166

27

Sciencemag.org

International weekly science journal, published by the American Association for the AdvancementMore of Science (AAAS). Less

2:13

2.02

28.40%

49,506

28

Bitcointalk.org

The main Bitcoin discussion forum, includes subforums for technical support, mining, developmenMoret and economics. Less

7:47

1.58

18.80%

1,202

29

Nps.gov

Official site, with extensive information on America's National Parks and their management.

3:18

2.94

62.60%

50,330

30

Rsc.org

The RSC is the largest organisation in Europe for advancing the chemical sciences. Supported byMore a worldwide network of members and an international publishing business, its activities span education, conferences, science policy and the promotion of chemistry to the public. Less

2:46

2.65

45.10%

14,418

31

Intellicast.com

Detailed weather and forecast information around the globe. Features include surface maps, charMorets, satellite imagery, and recreational outlooks. Less

2:19

2.09

4.70%

6,189

32

Livescience.com

This site explains the latest research on the planet, from human biology to the animal world anMored the forces of nature. Less

2:13

1.29

49.60%

30,585

33

Usda.gov

Enhancing the quality of life for the American people by supporting production of agriculture.

3:19

2.67

49.30%

58,843

34

Sigmaaldrich.com

Manufacturer of laboratory reagents in all fields of life sciences, including biochemistry, molMoreecular biology, cell culture and cell biology. Less

3:43

2.95

65.10%

3,748

35

Usgs.gov

Scientific agency for natural sciences, including earth science and biology. Extensive informatMoreion on U.S. water, biological, energy, and mineral resources, USGS programs, and natural disasters and hazards. Less

3:57

2.72

29.90%

39,494

36

23andme.com

DNA based ancestry testing to help identify your genetic relatives

7:16

6.08

23.00%

1,660

37

Fao.org

Site has many information resources and links on agricultural topics, as well as hunger, sustaiMorenable development, and related matters. Less

2:38

1.94

59.50%

37,231

38

Mdpi.com

MDPI has been publishing scholarly, peer-reviewed open access journals since 1996. Searchable bMorey title, author and article type. Less

2:55

2.55

34.70%

14,142

39

Thermofisher.com

Manufactures analytical instruments plus reagents and consumables, laboratory equipment, softwaMorere and services for the laboratory. Less

3:14

2.81

59.50%

1,904

40

Bom.gov.au

Weather, climate and hydrology services; also details educational projects, publications, and cMoreontacts. Less

6:26

2.79

14.10%

7,598

41

Iop.org

The site for physics and physicists, including information on Institute membership and activitiMorees, online news, books, magazines and journals. Less

2:08

2.01

47.10%

17,030

42

Plos.org

Advocates the free distribution of science and medical published articles.

2:12

1.53

42.30%

31,602

43

Aps.org

Information, member directory and many links.

3:14

3.42

35.40%

10,719

44

Symbolab.com

Semantic search engine for math and science expanding the searchable data space onto scientificMore notations, expressions, equations and formulas. Less

10:35

7.10

46.20%

194

45

Space.com

Features space and science news stories, interactive games, questions and answers, contests, kiMoreds' submissions, and weekly polls. Less

2:18

1.40

37.00%

17,565

46

Biomedcentral.com

An online journal that publishes peer-reviewed research across all areas of biology and medicinMoree with free access, plus commentary, reviews, collaboration tools, and database links. Less

2:24

1.68

35.30%

19,833

47

Colorado.edu

An accredited university offering bachelor's, master's, and doctoral degrees in over 150 fieldsMore of study in Boulder, Colorado. Less

4:25

4.36

36.20%

29,579

48

Wolfram.com

U.S. operations for the makers of Mathematica, a fully integrated technical computing software Morepackage, Wolfram|Alpha, and other programs. Includes online ordering and company information. Less

2:44

2.41

63.40%

17,755

49

Scientificamerican.com

Monthly magazine of science. Website includes articles from past issues.

1:55

1.28

48.00%

34,527

50

Popularmechanics.com

Informative articles on automotive technology, car parts, do it yourself repair, and used cars.

2:08

1.37

49.60%

15,798

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