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    Generated on Tuesday, June 20th 2017 8:04 am

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Traffic Rank

54 most visited website in the World Trend: up (-2)
50 most visited website in US United States
Traffic Rank is provided by Alexa

Visitors Localization

Low map legend High
CountryPercentDomain (ccTLD)Status
US United States17.6%stackoverflow.usNot available.
IN India12.3%stackoverflow.inNot available.
CN China10.6%stackoverflow.cnNot available.
JP Japan7.1%stackoverflow.jpNot available.
DE Germany3.2%stackoverflow.deNot available.
Registering country code top level domains (ccTLD) can prevent potential competitors from taking advantage of your primary domain reputation. It is also one of the ways to improve country specific SEO and performance. (


We have located images with missing ALT attribute.
Number of images: 12
Missing alt tag: 12

List of images with missing ALT attributes:

  • // (6 locations)
  • //
  • //
  • //
  • //
  • //
The "alt" attribute provides a text equivalent for the image. If the browser cannot display an image the alt description will be given in its place. Furthermore, some visitors cannot see images as they might be blind in which the alt tag provides a valuable image description. Finally, search engines utilize the alt attribute for image search indexing. (


We have found following title:

"Stack Overflow"

Length: 14 characters
The <TITLE> element provides a short piece of text describing the document. The title is very important as it shows in the window title bars, bookmarks and search results. Title should be between 60 to 80 characters long. (

Description Metatag

We have found following description:

"Stack Overflow is the largest online community for programmers to learn, share their knowledge, and advance their careers"

Length: 121 characters
The description attribute should provide a concise explanation of a Web page's content. Also, the description is often displayed on search engine results and can indirectly affect page ranking. (

Keywords Metatag

No Keywords Found.
The keywords attribute was utilized by search engines to provide more accurate search results. Due to the over usage and spamming the keywords attribute has been phased out and is no longer relevant. Google doesn't use the "keywords" meta tag in web search ranking.

Text to HTML Ratio

The Text to HTML ratio is 14.68%
Original content is by far the single most important element to search engines. Low Text to HTML ratio indicates little content for search engines to index. We consider it to be good practice to have a Text to HTML ratio of at least 10% and ideal above 20%

Keyword Density & Consistency

Consistent Keywords % Density # Count T Title D Desc. H <H> A ALT B <b>
mins ago4.23%86-----
stack overflow0.54%1111---
min ago0.34%7-----
stack exchange0.15%3--1--
secs ago0.15%3-----
largest online community0.05%1-1---
advance their careers0.05%1-1---
share their knowledge0.05%1-1---
setting using mac0.05%1--1--
using mac keyboard0.05%1--1--
Keywords density and consistency are notable factors for optimal page SEO. Preferred keywords should have higher keywords density indicating their importance. Optimally, preferred keywords should also be consistently utilized in multiple essential areas of the page such as title, description meta tag, h1 through h6 headings, alt image attributes, backlinks and internal links anchor text. Keyword density of above 5% is a good indication that the word or phrase appears too many time in the content.


No frames detected. We found 1 inline frame(s).
It is not recommended to use frames or iframes because they can cause problems for search engines. It is best to avoid frames and inline frames whenever possible ( If frames must be utilized consider <noframes> tag. (


No flash detected.
Flash and other reach-media technologies should primarily be utilized for decorative purposes. This makes your site more search engine friendly and improves accessibility (


  • 1 <H1>
    • Top Questions
  • 1 <H2>
    • Looking for more? Browse the complete list of questions, or popular tags. Help us answer unanswered questions.
  • 99 <H3>
    • current community
    • your communities
    • more stack exchange communities
    • Appmetrics-dash crashes app whenever I issue a postgresql query
    • Generic type that can be used with the “+” operator
    • Remove value from an array if it occur more than one time using PHP
    • Regex : Mr. X. Blabla Mr. Y. Blabla Catch_item, Get the last matching
    • DynamoDB Mapper mapping Collection Datatypes
    • SAPUI5 sap.ui.model.Filter on another Filter
    • Python: Permute with repetitions
    • Java Serialization : How use Object InputStream / Object Output Stream
    • SQL check if group containes certain values of given column
    • SQL Relation MORE on MORE
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    • xpath - search for number greater than and show parents
    • OpenCV 3 - Python 2.7 Anaconda - USB Camera aquire only black frames after a while
    • “Verification Inconclusive … with Dafny 1.9.9”
    • Get provisioning profile from iPhone local files
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    • Missing value for RR-interval (BLE / Polar device)
    • Integrity RTOS \ Multi Compiler
    • How to add a xscrollbar to Text widget in tkinter
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    • Cannot load driver: weblogic.jdbc.sqlserver.SQLServerDriver
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    • lapply with nested list
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    • Can we use request payload as List in spring boot API
    • jQuery tableExport plugin - preserve carriage returns
    • Updating SQL database table using WPF datagrid
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    • Custom google search restriction of 100 searches
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    • How to stop Msbuild command line from using debugkeystore for build project
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    • Being notified in application when user change volume setting using Mac Keyboard
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    • USQL Job failing due to exceeding the path length limit
  • 1 <H4>
    • Hot Network Questions
  • 0 <H5>
  • 0 <H6>
The <h1> to <h6> tags are used to define HTML headings. The <h1> tag should hold the title describing the content of a specific page therefore only one h1 tag is needed per page. There can be any number of h2 - h6 tags but they should be added in order of importance (


The <!DOCTYPE> declaration tells the web browser about what version of HTML the page is written in. It is good practice to always add the <!DOCTYPE> declaration to the HTML documents, so that the browser knows what type of document to expect. (

Character Encoding

Not declared.
To display an HTML page correctly, the browser must know what character-set to use (


Declared Language: None
Language Attribute: None
The HTML "lang" attributes and language metatag define the base language to be used for displaying text and characters on a Website.

W3C Markup Validation

Status: FAILED [14 errors, 3 warning(s)]
It is good practice to use valid HTML/XHTML markup as it ensures that the search engines can read the website correctly as well as it improves cross browser compatibility (W3C Markup Validation Service).

Deprecated HTML elements

Good, no deprecated elements found.
A deprecated element is one that has been outdated by newer constructs. Deprecated elements may become obsolete in future versions of HTML so it is recommended not to use them. (

Nested HTML Tables

Great, no nested tables detected.
In general it is not recommended to use nested tables or to utilize tables for page layout. Nested tables are known to cause performance issues due to increased HTML size and rendering time. It is better to use CSS layout instead.

Web Analytics

Yes, we have detected following web analytics tools:
  • Google analytics icon Google™ Analytics
  • Quantcast analytics icon Quantcast™ Measure
Web Analytics Tools collect and measure information about visitor activity on a website. Well interpreted web traffic data is invaluable in determining a successfully web strategy and assessing the effectiveness of a website. At a minimum, we recommend to utilize at least one web analytics tool.



Your robots.txt file is blocking search engines access to parts of the website.

  • Disallow: /posts/
  • Disallow: /posts?
  • Disallow: /amzn/click/?
  • See all 82 disallow directives
    A robots.txt file restricts access to search engine robots that crawl the web. (

    XML Sitemap

    Not found
    Sitemaps inform search engines about pages available for crawling. In its simplest form, a Sitemap is an XML file that lists URLs for a site along with additional metadata about each URL. XML sitemap should help search engines to crawl the site more intelligently. (

    Accessibility Check

    WCAG 2.0 (AA) Conformance Test: FAILED [18 error(s)]
    • Document has invalid language code.
      [Line 2, Col 1] <html> <head> <title>Stack Overflow</title> <link rel="shortcut icon" href="https://cdn.s ...
      Add a valid 2 letter or 3 letter language code as defined in the ISO 639 specification to the HTML 'lang' attribute. For XHTML, both 'lang' and 'xml:lang' must be set.
    • Document language not identified.
      [Line 2, Col 1] <html> <head> <title>Stack Overflow</title> <link rel="shortcut icon" href="https://cdn.s ...
      For HTML documents add the lang attribute and a valid ISO-639-1 two letter language code to the opening HTML element. For XHTML documents add both the lang and xmllang attributes with a valid ISO-639-1 two letter language code to the opening HTML element.
    Subscribe to review all 18 errors
    Following Web accessibility standards while developing a website can help users with specific needs, such as visually impaired, motor/mobility, auditory, seizures, as well as cognitively and intellectually impaired disabilities. Some of these fixes include general seo applications like Alt tags, Form labels, fixing empty links and adding alternative text. To read more about accessibility guidelines follow this link Web Content Accessibility Guidelines (WCAG) Overview.

    Mobile Rendering

    Mobile internet usage has been exceeding PC's since 2014 and growing so it is critical for pages to render correctly on mobile devices.

    Mobile Optimization

    Mobile PageSpeed analyzes webpages and evaluates its performance while providing suggestions on reducing page load times. Google is incorporating website speed in search ranking (

    Mobile Experience

    Mobile users have now become a critical part of online visits. Making the website mobile friendly is no longer an option but rather necessity. (


    The Favicon is a small icon associated with a website. The Favicon is important because it is displayed next to the website's URL in the address bar of the browser as well as in bookmarks and shortcuts. (

    Custom 404 Error Page

    Yes, custom 404 error page detected.
    A 404 is a standard http response code for a resource that cannot be located on the server. Webservers usually return a "404 Not Found" error page for non-existing pages. Unfortunately, these default error pages are very generic and a not very user friendly, therefore, using a custom 404 error page is highly recommended.

    Process of returning http status code "200 OK" for a non-existent page or redirecting users to another url is called soft 404. Soft 404 errors are problematic for search engines and are not advisable. (


    Print-friendly pages are designed to fit on an 8.5"x11" or A4 sheet and usually include only the content of the page, along with source information. (

    W3C CSS Validation

    Status: FAILED [103 error(s)]
    It is recommended to use valid CSS to ensure that the website displays correctly. (W3C CSS Validation Service).

    Domain Age

    Your domain was registerd for the first time: 13 years, 5 months, 25 days ago.
    Age of the domain is one of the many signals that search engines utilize for ranking. Brand new domains generally have more difficult time to rank high for the first few months. (

    Domain Expiration

    Your domain expires in: 7 months, 12 days, 5 hours.
    Domain expiration far in to the future is considered a good practice as it promotes confidence in your website, decreases chances of losing domain and in certain cases might help with search engine ranking. (

    IP Canonicalization

    No, your site's IP does not redirect to
    Some web spiders index websites using IP as well as domain name which can cause duplicate content if there is no IP Canonicalization. (

    URL Canonicalization

    Yes, both the and resolve to the same URL.
    Domain name with WWW and without can be considered as different pages causing duplicate content for search engines. (

    Page Speed

    Google Page Speed score: 86% (High)
    Rq. Requests Hst. Hosts LT Load time Html Img Images JS JavaScript CSS F Flash O Other PS Page Size
    47212.23s357.53 KB188.39 KB490.38 KB571.68 KB0 B6.03 KB1.58 MB

    Avoid landing page redirects
    Enable compression
    Leverage browser caching
    Reduce server response time
    Minify CSS
    Minify HTML
    Minify JavaScript
    Eliminate render-blocking JavaScript and CSS in above-the-fold content
    Optimize images
    Prioritize visible content

    Subscribe for more details
    PageSpeed analyzes webpages and evaluates its performance while providing suggestions on reducing page load times. Google is now incorporating website speed in search ranking (

    Server Information


    Server IP:
    Server Location:
    US CALIFORNIA, San Francisco

    Name Server 1: (
    Name Server 2: (
    Name Server 3: (
    Name Server 4: (
    Your server's IP address and location have minor impact on the country specific SEO. It is recommend to host the website in the country where the number of vistors is desired to be the highest. Search engines take the geolocation of a server into account. (


    Issued To:
    Common Name (CN):
    Common Name (CN):
    DigiCert SHA2 High Assurance Server CA
    Oranization (O):
    DigiCert Inc
    Oranizational Unit (OU):
    Period of Validity
    Begins On:
    Expires On:
    Google™ is now treating HTTPS as a ranking signal. HTTPS is a secure web protocol that allows for encrypted communication between website and the client. HTTPS protocol requires your website to have an SSL certificate, which can be purchased from a Certificate Authority (CA) or SSL vendor. (

    Safe Browsing

    Safe Browsing is a service provided by Google that enables applications to check URLs against Google's constantly updated lists of suspected phishing and malware pages. If your site is marked as unsafe see our guide on how to fix websites blocked by google safe browsing

    Spam Blacklist

    Good, your IP is not blacklisted.
    Spammer directories provide lists of IPs from which spam distribution is reported. Emails sent from the blocked IPs are subject to closer scrutiny and are much less likely to be delivered. For email campaigns it is recommended to utilize professional email services to ensure that your website IP is not blocked. (

    Email Address Obfuscation

    Great, this webpage does not contain email addresses displayed in plain text.
    It is recommended to obfuscate email addresses posted in public. This prevents email addresses from being automatically harvested by spam bots which helps to decrease number of unsolicited emails. See our email obfuscation techniques guide for more details.

    Directory Browsing

    Great, your server has directory browsing disabled.
    Protect Webserver directories from unwanted browsing. To enhance security, directory browsing should be disabled unless you have a specific reason to enable it. If you enable directory browsing, make sure that you only enable it on the particular directory or directories that you want to share. (

    Whois Privacy

    No contact information available.
    Whois Privacy is a service that prevents domain owner contact information from being displayed in the publicly available Whois records. This can help to cut down on unwanted spam but utilizing Whois privacy should be evaluated against business model and branding strategy.

    Server Signature

    Good, your server does not provide version information.
    Attackers can utilize server signature versioning information to their advantage therefore it is recommended to disable it when possible. (Disable server signature for Apache or IIS).