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91 stackoverflow.com Last Updated: 3 years

Success 54% of passed verification steps
Warning 23% of total warning
Errors 23% of total errors, require fast action
Share

Desktop

Mobile

Performance Desktop Score 99%
Best Practices Desktop Score 93%
SEO Desktop Score 91%
Progressive Web App Desktop Score 45%
Performance Mobile Score 58%
Best Practices Mobile Score 93%
SEO Mobile Score 88%
Progressive Web App Mobile Score 50%
Page Authority Authority 77%
Domain Authority Domain Authority 93%
Moz Rank 7.7/10
Bounce Rate Rate 0%
Title Tag 67 Characters
STACK OVERFLOW - WHERE DEVELOPERS LEARN, SHARE, & BUILD CAREERS
Meta Description 169 Characters
Stack Overflow is the largest, most trusted online community for developers to learn, share​ ​their programming ​knowledge, and build their careers.
Effective URL 25 Characters
https://stackoverflow.com
Excerpt Page content
Stack Overflow - Where Developers Learn, Share, & Build Careers ...
Keywords Cloud Density
stack32 teams30 overflow23 knowledge18 help11 free10 team10 technical9 more9 language8
Keyword Consistency Keyword density is one of the main terms in SEO
Keyword Freq Title Desc Domain H1 H2
stack 32
teams 30
overflow 23
knowledge 18
help 11
free 10
team 10
technical 9
more 9
language 8
Google Preview Your look like this in google search result
STACK OVERFLOW - WHERE DEVELOPERS LEARN, SHARE, & BUILD
https://stackoverflow.com
Stack Overflow is the largest, most trusted online community for developers to learn, share​ ​their programming ​knowledge, and b
Robots.txt File Detected
http://stackoverflow.com/robots.txt
Sitemap.xml File No Found
http://stackoverflow.com/sitemap.xml
Whois Is a query and response protocol that is widely used for querying databases that store the registered users or assignees of an Internet resource, such as a domain name, an IP address block, or an autonomous system
Updated: 2020-01-08 / 4 years
Create on: 2003-12-27 / 20 years
Expires on: 2021-02-02 / 39 months 10 days

Name.com, Inc. ,
Registrar Whois Server: whois.name.com
Registrar URL: http://www.name.com

Nameservers
NS-1033.AWSDNS-01.ORG
NS-358.AWSDNS-44.COM
NS-CLOUD-E1.GOOGLEDOMAINS.COM
NS-CLOUD-E2.GOOGLEDOMAINS.COM
Page Size Code & Text Ratio
Document Size: ~190.95 KB
Code Size: ~150.41 KB
Text Size: ~40.54 KB Ratio: 21.23%

Social Data

Estimation Traffic and Earnings

695,190
Unique Visits
Daily
1,286,101
Pages Views
Daily
$2,482
Income
Daily
19,465,320
Unique Visits
Monthly
36,653,879
Pages Views
Monthly
$62,050
Income
Monthly
225,241,560
Unique Visits
Yearly
432,129,936
Pages Views
Yearly
$655,248
Income
Yearly

Technologies

PWA - Manifest

Manifest is not valid
Your site don't have valid manifest.json, read more in Web App Manifest

Desktop

Desktop Screenshot
Cumulative Layout Shift 0.017
Cumulative Layout Shift measures the movement of visible elements within the viewport
Remove unused JavaScript Potential savings of 59 KiB
Remove unused JavaScript to reduce bytes consumed by network activity
Links do not have descriptive text 1 link found
Descriptive link text helps search engines understand your content
First Contentful Paint 0.7 s
First Contentful Paint marks the time at which the first text or image is painted
Estimated Input Latency 10 ms
Estimated Input Latency is an estimate of how long your app takes to respond to user input, in milliseconds, during the busiest 5s window of page load. If your latency is higher than 50 ms, users may perceive your app as laggy
Speed Index 0.7 s
Speed Index shows how quickly the contents of a page are visibly populated
Network Round Trip Times 0 ms
Network round trip times (RTT) have a large impact on performance. If the RTT to an origin is high, it's an indication that servers closer to the user could improve performance
Largest Contentful Paint 0.9 s
Largest Contentful Paint marks the time at which the largest text or image is painted
Eliminate render-blocking resources Potential savings of 380 ms
Resources are blocking the first paint of your page. Consider delivering critical JS/CSS inline and deferring all non-critical JS/styles
Max Potential First Input Delay 40 ms
The maximum potential First Input Delay that your users could experience is the duration of the longest task
Largest Contentful Paint element 1 element found
This is the largest contentful element painted within the viewport
Properly size images Potential savings of 20 KiB
Serve images that are appropriately-sized to save cellular data and improve load time
Avoids enormous network payloads Total size was 608 KiB
Large network payloads cost users real money and are highly correlated with long load times
Keep request counts low and transfer sizes small 50 requests • 608 KiB
To set budgets for the quantity and size of page resources, add a budget.json file
First Meaningful Paint 0.8 s
First Meaningful Paint measures when the primary content of a page is visible
Avoid an excessive DOM size 1,144 elements
A large DOM will increase memory usage, cause longer [style calculations](https://developers.google.com/web/fundamentals/performance/rendering/reduce-the-scope-and-complexity-of-style-calculations), and produce costly [layout reflows](https://developers.google.com/speed/articles/reflow)
Server Backend Latencies 0 ms
Server latencies can impact web performance. If the server latency of an origin is high, it's an indication the server is overloaded or has poor backend performance
Initial server response time was short Root document took 100 ms
Keep the server response time for the main document short because all other requests depend on it
Time to Interactive 0.8 s
Time to interactive is the amount of time it takes for the page to become fully interactive
Serve static assets with an efficient cache policy 43 resources found
A long cache lifetime can speed up repeat visits to your page
JavaScript execution time 0.0 s
Consider reducing the time spent parsing, compiling, and executing JS. You may find delivering smaller JS payloads helps with this
Total Blocking Time 0 ms
Sum of all time periods between FCP and Time to Interactive, when task length exceeded 50ms, expressed in milliseconds
Minimize third-party usage Third-party code blocked the main thread for 0 ms
Third-party code can significantly impact load performance. Limit the number of redundant third-party providers and try to load third-party code after your page has primarily finished loading
Remove unused CSS Potential savings of 93 KiB
Remove dead rules from stylesheets and defer the loading of CSS not used for above-the-fold content to reduce unnecessary bytes consumed by network activity
Avoid large layout shifts 5 elements found
These DOM elements contribute most to the CLS of the page.
Includes front-end JavaScript libraries with known security vulnerabilities 4 vulnerabilities detected
Some third-party scripts may contain known security vulnerabilities that are easily identified and exploited by attackers
Avoid chaining critical requests 11 chains found
The Critical Request Chains below show you what resources are loaded with a high priority. Consider reducing the length of chains, reducing the download size of resources, or deferring the download of unnecessary resources to improve page load
First CPU Idle 0.8 s
First CPU Idle marks the first time at which the page's main thread is quiet enough to handle input. [Learn more](https://web.dev/first-cpu-idle/).
Web app manifest or service worker do not meet the installability requirements 1 reason
Service worker is the technology that enables your app to use many Progressive Web App features, such as offline, add to homescreen, and push notifications. With proper service worker and manifest implementations, browsers can proactively prompt users to add your app to their homescreen, which can lead to higher engagement
Minimizes main-thread work 0.5 s
Consider reducing the time spent parsing, compiling and executing JS. You may find delivering smaller JS payloads helps with this

Mobile

Mobile Screenshot
Tap targets are not sized appropriately 50% appropriately sized tap targets
Interactive elements like buttons and links should be large enough (48x48px), and have enough space around them, to be easy enough to tap without overlapping onto other elements
Largest Contentful Paint 3.6 s
Largest Contentful Paint marks the time at which the largest text or image is painted
Reduce JavaScript execution time 1.6 s
Consider reducing the time spent parsing, compiling, and executing JS. You may find delivering smaller JS payloads helps with this
Max Potential First Input Delay 580 ms
The maximum potential First Input Delay that your users could experience is the duration of the longest task
First Contentful Paint 3.3 s
First Contentful Paint marks the time at which the first text or image is painted
Avoid large layout shifts 5 elements found
These DOM elements contribute most to the CLS of the page.
Avoid chaining critical requests 11 chains found
The Critical Request Chains below show you what resources are loaded with a high priority. Consider reducing the length of chains, reducing the download size of resources, or deferring the download of unnecessary resources to improve page load
Defer offscreen images Potential savings of 54 KiB
Consider lazy-loading offscreen and hidden images after all critical resources have finished loading to lower time to interactive
Network Round Trip Times 0 ms
Network round trip times (RTT) have a large impact on performance. If the RTT to an origin is high, it's an indication that servers closer to the user could improve performance
First Meaningful Paint 3.7 s
First Meaningful Paint measures when the primary content of a page is visible
Reduce the impact of third-party code Third-party code blocked the main thread for 1,410 ms
Third-party code can significantly impact load performance. Limit the number of redundant third-party providers and try to load third-party code after your page has primarily finished loading
Avoid long main-thread tasks 15 long tasks found
Lists the longest tasks on the main thread, useful for identifying worst contributors to input delay
Includes front-end JavaScript libraries with known security vulnerabilities 4 vulnerabilities detected
Some third-party scripts may contain known security vulnerabilities that are easily identified and exploited by attackers
Estimated Input Latency 220 ms
Estimated Input Latency is an estimate of how long your app takes to respond to user input, in milliseconds, during the busiest 5s window of page load. If your latency is higher than 50 ms, users may perceive your app as laggy
Avoid an excessive DOM size 1,144 elements
A large DOM will increase memory usage, cause longer [style calculations](https://developers.google.com/web/fundamentals/performance/rendering/reduce-the-scope-and-complexity-of-style-calculations), and produce costly [layout reflows](https://developers.google.com/speed/articles/reflow)
Avoid non-composited animations 1 animated element found
Animations which are not composited can be janky and increase CLS
First Contentful Paint (3G) 6178 ms
First Contentful Paint 3G marks the time at which the first text or image is painted while on a 3G network
First CPU Idle 5.9 s
First CPU Idle marks the first time at which the page's main thread is quiet enough to handle input. [Learn more](https://web.dev/first-cpu-idle/).
Total Blocking Time 1,030 ms
Sum of all time periods between FCP and Time to Interactive, when task length exceeded 50ms, expressed in milliseconds
Web app manifest or service worker do not meet the installability requirements 1 reason
Service worker is the technology that enables your app to use many Progressive Web App features, such as offline, add to homescreen, and push notifications. With proper service worker and manifest implementations, browsers can proactively prompt users to add your app to their homescreen, which can lead to higher engagement
Avoids enormous network payloads Total size was 498 KiB
Large network payloads cost users real money and are highly correlated with long load times
Links do not have descriptive text 1 link found
Descriptive link text helps search engines understand your content
Keep request counts low and transfer sizes small 48 requests • 498 KiB
To set budgets for the quantity and size of page resources, add a budget.json file
Time to Interactive 6.2 s
Time to interactive is the amount of time it takes for the page to become fully interactive
Minimize main-thread work 6.0 s
Consider reducing the time spent parsing, compiling and executing JS. You may find delivering smaller JS payloads helps with this
Serve static assets with an efficient cache policy 41 resources found
A long cache lifetime can speed up repeat visits to your page
Largest Contentful Paint element 1 element found
This is the largest contentful element painted within the viewport
Remove unused JavaScript Potential savings of 59 KiB
Remove unused JavaScript to reduce bytes consumed by network activity
Remove unused CSS Potential savings of 93 KiB
Remove dead rules from stylesheets and defer the loading of CSS not used for above-the-fold content to reduce unnecessary bytes consumed by network activity
Initial server response time was short Root document took 190 ms
Keep the server response time for the main document short because all other requests depend on it
Document uses legible font sizes 95.33% legible text
Font sizes less than 12px are too small to be legible and require mobile visitors to “pinch to zoom” in order to read. Strive to have >60% of page text ≥12px
Server Backend Latencies 0 ms
Server latencies can impact web performance. If the server latency of an origin is high, it's an indication the server is overloaded or has poor backend performance
Speed Index 3.6 s
Speed Index shows how quickly the contents of a page are visibly populated
Cumulative Layout Shift 0.004
Cumulative Layout Shift measures the movement of visible elements within the viewport
Eliminate render-blocking resources Potential savings of 2,040 ms
Resources are blocking the first paint of your page. Consider delivering critical JS/CSS inline and deferring all non-critical JS/styles

Speed And Optimization Tips

Website speed has a huge impact on performance, affecting user experience, conversion rates and even rankings. ‪‬‬By reducing page load-times, users are less likely to get distracted and the search engines are more likely to reward you by ranking you
Title Website
Warning! Your title is not optimized
Description Website
Warning! Your description is not optimized
Robots.txt
Congratulations! Your site have a robots.txt file
Sitemap.xml
Warning! Not found a sitemap file for your website
SSL Secure
Congratulations! Your site have Support to HTTPS
Headings
Congratulations! You are using your H1 and H2 tags in your site
Blacklist
Congratulations! Your site is not listed in a blacklist
W3C Validator
Warning! Your site have errors W3C
Accelerated Mobile Pages (AMP)
Warning! Your site not have AMP Version
Domain Authority
Congratulations! Your Domain Authority is good
GZIP Compress
Warning! Your site not is compressed, this can make slower response for the visitors
Favicon
Congratulations! Your website appears to have a favicon.
Broken Links
Congratulations! You not have broken links View links
First 20 Links Relationship HTTP Status
Stack Overflow Internal Link 200
About Internal Link 301
For Teams Internal Link 301
Stack Overflow Public questions & answers Internal Link 301
Jobs Programming & related technical career opportunities Internal Link 301
Talent Recruit tech talent & build your employer brand Internal Link 302
Advertising Reach developers & technologists worldwide Internal Link 200
Log in Internal Link 200
Sign up Internal Link 200
help Internal Link 200
chat Internal Link 200
Meta Stack Overflow Internal Link 200
Sign up Internal Link 200
log in Internal Link 200
Home Internal Link 301
Tags Internal Link 301
Users Internal Link 301
Jobs Internal Link 301
Companies Internal Link 301
Create a free Team Internal Link 200

Alexa Rank

47

Global Rank

19

India
Traffic
Search

Domain Available

Domain (TDL) and Typo Status
stackoverflow.co Already Registered
stackoverflow.us Already Registered
stackoverflow.com Already Registered
stackoverflow.org Already Registered
stackoverflow.net Already Registered
sackoverflow.com Already Registered
wtackoverflow.com Already Registered
xtackoverflow.com Already Registered

Information Server

Response Header HTTP headers carry information about the client browser, the requested page and the server 
HTTP/1.1 200 OK
Connection: keep-alive
cache-control: private
content-type: text/html; charset=utf-8
content-encoding: gzip
strict-transport-security: max-age=15552000
x-frame-options: SAMEORIGIN
x-request-guid: 316d7824-4661-430e-8c2e-dff3cad4fbd9
feature-policy: microphone 'none'; speaker 'none'
content-security-policy: upgrade-insecure-requests; frame-ancestors 'self' https://stackexchange.com
Accept-Ranges: bytes
Date: Sun, 23 May 2021 14:31:39 GMT
Via: 1.1 varnish
X-Served-By: cache-yul12823-YUL
X-Cache: MISS
X-Cache-Hits: 0
X-Timer: S1621780300.927948,VS0,VE14
Vary: Accept-Encoding,Fastly-SSL
X-DNS-Prefetch-Control: off
Set-Cookie: prov=ac7277a7-7ce2-8bb2-0272-ac29c0360ad0; domain=.stackoverflow.com; expires=Fri, 01-Jan-2055 00:00:00 GMT; path=/; HttpOnly
DNS Records DNS Resource Records associated with a hostname
View DNS Records
Type Name Value Class TTL
A stackoverflow.com 151.101.65.69 IN 2953
A stackoverflow.com 151.101.129.69 IN 2953
A stackoverflow.com 151.101.1.69 IN 2953
A stackoverflow.com 151.101.193.69 IN 2953
NS stackoverflow.com ns-1033.awsdns-01.org IN 21599
NS stackoverflow.com ns-358.awsdns-44.com IN 21599
NS stackoverflow.com ns-cloud-e1.googledomains.com IN 21599
NS stackoverflow.com ns-cloud-e2.googledomains.com IN 21599
MX stackoverflow.com aspmx.l.google.com IN 299
MX stackoverflow.com alt3.aspmx.l.google.com IN 299
MX stackoverflow.com alt4.aspmx.l.google.com IN 299
MX stackoverflow.com alt1.aspmx.l.google.com IN 299
MX stackoverflow.com alt2.aspmx.l.google.com IN 299
TXT stackoverflow.com MS=ms52592611 IN 101
TXT stackoverflow.com apple-domain-verification=O9jlnJXAQ7sNSZqC IN 101
TXT stackoverflow.com atlassian-domain-verification=byLeZgl3MIcfOqwWuMhq8Fhr/1zem/jIaouJegvDZbBKUU5OqhwDjdpkyYg5CTzm IN 101
TXT stackoverflow.com docusign=4262531d-29f4-4a62-9f33-ae9f66f5247b IN 101
TXT stackoverflow.com google-site-verification=2Bi6SYw5skkRexdtdLPL2gpxeIhLxnYVqITVP9Htl3w IN 101
TXT stackoverflow.com google-site-verification=ctogLnZNAdc_CXq8yOhODMLpmugGynjxKecKHDz4oL8 IN 101
TXT stackoverflow.com google-site-verification=o3EMam8yBGo1yEjyybIiZcOunGHOQKpo8JmOtp9n1BU IN 101
TXT stackoverflow.com google-site-verification=rdWtMbplKjbRHGr2dNONfwkqithlUvjr3u6i8QEz_mo IN 101
TXT stackoverflow.com v=spf1 ip4:198.252.206.0/24 include:_spf1.stackoverflow.com ~all IN 101

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