Profile: Coursera coursera.org

View Coursera outages and uptime

Coursera is an online educational platform that offers massive open online courses.


  Uptime last 24 hours

  Response Time last 24 hours

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Average Rating:

My Rating:

Current Status

Up

For 2 years, 8 months
(Since Jul 29, 2015 3:51 p.m. GMT)

Uptime For Period
100%
Latest Downtime
No downtime recorded.

  Web Speed Test Results

Loading timeRequestsTotal SizePerformace GradeMobile Usability
8080 ms 147 2.3 MB 53/100 95/100
Location: Tokyo, Japan
Date: 2018-04-19 15:06
TypeURLSize
0.0 s
1.0 s
2.0 s
3.0 s
4.0 s
5.0 s
Other /
coursera.org
680 B
Document /
www.coursera.org
552.7 KB
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25.1 KB
Script /webapps/builds/dll/loader.5b8b9...
d3njjcbhbojbot.cloudfront.net
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Script /webapps/builds/front-page/prelo...
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1.1 KB
Script /webapps/builds/front-page/loade...
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1.2 KB
Script /webapps/builds/front-page/en.ap...
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2.4 KB
Image /api/utilities/v1/imageproxy/htt...
d3njjcbhbojbot.cloudfront.net
26.7 KB
Script /eventing/info.v2
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512 B
Script /webapps/builds/dll/0.5b8b9ce19b...
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Script /gtm.js
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Script /webapps/builds/front-page/5.181...
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13.4 KB
XHR /eventing/infoBatch.v2
www.coursera.org
612 B
Script /analytics.js
www.google-analytics.com
14.4 KB
Script /pagead/conversion_async.js
www.googleadservices.com
6.3 KB
Script /en_US/fbevents.js
connect.facebook.net
12.6 KB
Script /bat.js
bat.bing.com
4.8 KB
Script /113717.ct.js
intljs.rmtag.com
16.5 KB
Script /airpr.js
px.airpr.com
1.7 KB
Script /eventing/info.v2
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511 B
Script /webapps/builds/front-page/en.2....
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11.8 KB
Script /webapps/builds/front-page/0.9d2...
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6.2 KB
Font /web/type/opensans/OpenSans-Bold...
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XHR /suggestions_with_domains.json
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119.7 KB
Script /pagead/viewthroughconversion/92...
googleads.g.doubleclick.net
1.6 KB
XHR /eventing/infoBatch.v2
www.coursera.org
540 B
Script /js/6577/
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3.6 KB
Script /signals/config/946401778754875
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15.6 KB
Image /action/0
bat.bing.com
172 B
Image /dcv4/lqs.aspx
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238 B
Image /dcv4/lqs.aspx
nyt2.dc-storm.com
236 B
Image /tr/
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296 B
Image /ads/user-lists/927621030/
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356 B
Document /pix/6577
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21.6 KB
Image /collect
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197 B
Other /r/collect
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428 B
Image /collect
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93 B
Other /r/collect
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162 B
Script /act.php
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1.9 KB
Script /en_US/fbevents.js
connect.facebook.net
12.3 KB
Image /ads/ga-audiences
www.google.com
241 B
Image /ads/ga-audiences
www.google.com
109 B
Script /webapps/builds/front-page/12.9a...
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10.4 KB
Image /tr/
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200 B
Other /sync
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221 B
Image /collect
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99 B
Script /signals/config/375767869524666
connect.facebook.net
15.4 KB
Other /tap.php
pixel.rubiconproject.com
407 B
Other /pixel
cm.g.doubleclick.net
878 B
Other /mapuser
ums.adtechus.com
267 B
Other /rum
dsum-sec.casalemedia.com
673 B
Image /tr/
www.facebook.com
98 B
Image /rtb/um
mapping.nxtck.com
771 B
Image /rum
dsum-sec.casalemedia.com
1.0 KB
Image /sync
sync.adaptv.advertising.com
492 B
Image /tap.php
pixel.rubiconproject.com
842 B
XHR /eventing/infoBatch.v2
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537 B
Other /w/1.0/sd
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420 B
Image /w/1.0/sd
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318 B
Image /redir/
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611 B
Other /458359.gif
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751 B
Other /track/cmb/generic
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447 B
Other /
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605 B
Image /cs
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612 B
Image /cs
tags.rd.linksynergy.com
612 B
Image /AdServer/Pug
image2.pubmatic.com
954 B
Other /track/cmf/rubicon
match.adsrvr.org
635 B
Other /bounce
secure.adnxs.com
991 B
Image /mapuser
ums.adtechus.com
161 B
Other /match
ad.360yield.com
620 B
Image /
p.skimresources.com
247 B
Image /rum
dsum-sec.casalemedia.com
940 B
Image /anpx
dpx.airpr.com
171 B
Image /tr/
www.facebook.com
144 B
Image /ul_cb/match
ad.360yield.com
770 B
Total requests: 147 2.3 MB Load end time: 8.1 s

Performance

Your page has 1 blocking CSS resources. This causes a delay in rendering your page.

None of the above-the-fold content on your page could be rendered without waiting for the following resources to load. Try to defer or asynchronously load blocking resources, or inline the critical portions of those resources directly in the HTML.

Optimize CSS Delivery of the following:

  • https://d3njjcbhbojbot.cloudfront.net/webapps/builds/front-page/app.ac6cdf2e082827521f74.css

Your page has 2 redirects. Redirects introduce additional delays before the page can be loaded.

Avoid landing page redirects for the following chain of redirected URLs.

  • http://coursera.org/
  • https://coursera.org/
  • https://www.coursera.org/

In our test, your server responded in 0.26 seconds. There are many factors that can slow down your server response time. Please read our recommendations to learn how you can monitor and measure where your server is spending the most time.

Setting an expiry date or a maximum age in the HTTP headers for static resources instructs the browser to load previously downloaded resources from local disk rather than over the network.

Leverage browser caching for the following cacheable resources:

  • https://d3njjcbhbojbot.cloudfront.net/api/utilities/v1/imageproxy/https://d396qusza40orc.cloudfront.net/phoenixassets/Spanish-Launch-10-7-images/Thumbnails%20of%20Banner%20%28Logos%29/tesol_ASU_banner.jpg?auto=format%2Ccompress&dpr=1&fit=crop&w=225&h=130 (10 minutes)
  • https://www.googletagmanager.com/gtm.js?id=GTM-5JKLVK&l=dataLayer (15 minutes)
  • https://connect.facebook.net/en_US/fbevents.js (20 minutes)
  • https://connect.facebook.net/signals/config/375767869524666?v=2.8.12&r=stable (20 minutes)
  • https://connect.facebook.net/signals/config/946401778754875?v=2.8.12&r=stable (20 minutes)
  • https://bat.bing.com/bat.js (30 minutes)
  • https://www.googleadservices.com/pagead/conversion_async.js (60 minutes)
  • https://www.google-analytics.com/analytics.js (2 hours)

Properly formatting and compressing images can save many bytes of data.

Optimize the following images to reduce their size by 9KiB (40% reduction).

  • Compressing https://d3njjcbhbojbot.cloudfront.net/web/images/favicons/apple-touch-icon-144x144.png could save 5.8KiB (59% reduction).
  • Compressing https://d3njjcbhbojbot.cloudfront.net/web/images/icons/en_generic_rgb_wo_45.png could save 3.3KiB (25% reduction).

Compacting HTML code, including any inline JavaScript and CSS contained in it, can save many bytes of data and speed up download and parse times.

Minify HTML for the following resources to reduce their size by 1.2KiB (23% reduction).

  • Minifying https://tags.rd.linksynergy.com/pix/6577?type=pos&pt=home&href=https%3A%2F%2Fwww.coursera.org%2F could save 1.2KiB (23% reduction) after compression.

Compressing resources with gzip or deflate can reduce the number of bytes sent over the network.

Enable compression for the following resources to reduce their transfer size by 931B (56% reduction).

  • Compressing https://act-us.rd.linksynergy.com/act.php?tag=46248&mt= could save 931B (56% reduction).

Compacting JavaScript code can save many bytes of data and speed up downloading, parsing, and execution time.

Minify JavaScript for the following resources to reduce their size by 383B (15% reduction).

  • Minifying https://tags.rd.linksynergy.com/js/6577/?pt=home could save 383B (15% reduction) after compression.

Your CSS is minified. Learn more about minifying CSS.

You have the above-the-fold content properly prioritized. Learn more about prioritizing visible content.

Mobile Usability

The page content is too wide for the viewport, forcing the user to scroll horizontally. Size the page content to the viewport to provide a better user experience.

The page content is 427 CSS pixels wide, but the viewport is only 412 CSS pixels wide. The following elements fall outside the viewport:

  • The element <div class="bt3-col-md-12 c-pua-heading">Credentials That Count</div> falls outside the viewport.
  • The element <div class="bt3-row">Earn Degrees f…es on Coursera</div> falls outside the viewport.
  • The element <div class="bt3-col-md-12…tton-container">Learn More</div> falls outside the viewport.

Some of the links/buttons on your webpage may be too small for a user to easily tap on a touchscreen. Consider making these tap targets larger to provide a better user experience.

The following tap targets are close to other nearby tap targets and may need additional spacing around them.

  • The tap target <button class="nostyle promo-dismiss-button"></button> is close to 2 other tap targets final.
  • The tap target <a href="intent:courser…a.android;end;" class="nostyle banner…lign-items-top">Coursera for A…oid(75000+)GET</a> is close to 1 other tap targets final.
  • The tap target <div class="rc-PromoBanner">Credentials Th…seraLearn More</div> and 1 others are close to other tap targets final.
  • The tap target <a href="/specializatio…gle-it-support" class="card-link nostyle">GoogleGoogle I…Specialization</a> and 7 others are close to other tap targets.
  • The tap target <button type="button" class="slick-next slick-arrow">Next</button> and 7 others are close to other tap targets.

The text on your page is legible. Learn more about using legible font sizes.

Your page specifies a viewport matching the device's size, which allows it to render properly on all devices. Learn more about configuring viewports.

Your page does not appear to use plugins, which would prevent content from being usable on many platforms. Learn more about the importance of avoiding plugins.

Loading Time per Content Type

Loading Time per Domain

Size per Content Type

Size per Domain

Requests per Content Type

Requests per Domain

DateLoad speedRequestsPage size
April 19, 2018, 3:06 p.m. (current result)8.1 s1472.3 MB

  Domain Health Check Results

DNS
0 Errors
0 Warnings
3 Passed
Web Server
0 Errors
0 Warnings
3 Passed
Mail Server
0 Errors
0 Warnings
0 Passed
Blacklist & Malware
0 Errors
0 Warnings
2 Passed

DNS

Type Test Result
DNS Get DNS Records Click "More Info" to review your DNS records.
TXT  "google-site-verification=l-IugqqOHDGlHpUHfv3e6z8J1koLgfGSem04lqBA_B8"
TXT  "google-site-verification=tbpsWy5oBEvo-Kod36Lqsb3qRK0h_divcCGAeUdVZlk"
TXT  "spf2.0/pra include:amazonses.com include:sendgrid.net include:_spf.google.com include:spf.mtasv.net -all"
WHOIS Get WHOIS Records Click "More Info" to review your WHOIS records.
Registrant Name: dns administrator
Nameservers: ns-1481.awsdns-57.org,ns-1590.awsdns-06.co.uk,ns-258.awsdns-32.com,ns-688.awsdns-22.net
Expires: 2023-01-12
Registrant Email: dns@coursera.org
Registrar: godaddy.com, llc
Registrant Org: coursera inc
Admin Email: dns@coursera.org
Tech Email: dns@coursera.org
WHOIS Domain Expiry WHOIS OK - 1769 days left for domain, expires '2023-01-12'.
WHOIS OK - 1769 days left for domain, expires '2023-01-12'.
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Web Server

Type Test Result
HTTP Web Server HTTP HTTP OK: HTTP/1.1 301 Moved Permanently - 549 bytes in 0.037 second response time
HTTP OK: HTTP/1.1 301 Moved Permanently - 549 bytes in 0.037 second response time
HTTPS Web Server HTTPS HTTP OK: HTTP/1.1 301 Moved Permanently - 910 bytes in 0.081 second response time
HTTP OK: HTTP/1.1 301 Moved Permanently - 910 bytes in 0.081 second response time
SSL Certificate SSL Certificate Expiry SSL_CERT OK - x509 certificate 'coursera.org' from 'Amazon' valid until Nov 19 12:00:00 2018 GMT (expires in 255 days)
SSL_CERT OK - x509 certificate 'coursera.org' from 'Amazon' valid until Nov 19 12:00:00 2018 GMT (expires in 255 days)
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Mail Server

Type Test Result
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Blacklist & Malware

Type Test Result
Virus & Malware Virus & Malware MALWARE OK
MALWARE OK
Blacklist Spam Blacklists OK: 52.85.131.158 not on known spam blacklists (91 blacklists checked.)
OK: 52.85.131.158 not on known spam blacklists
 (91 blacklists checked.)
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Everytime I try to log in via facebook I get "Coursera is down for maintenance" 9 hours ago
is under maintenance since yesterday 1 week ago
cannot access the site now 1 week, 2 days ago