Sal.csl.sri.com - SEO Checker

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Overview of the SEO Check
Meta information
100% 
Page quality
50% 
Page structure
100% 
Link structure
98% 
Server
85% 
External factors
100% 
SEO Score
Response time
0.54 s
File size
3.50 kB
Words
212
Media files
1
Number of links
11 internal / 2 external

Task list of SEO Improvements

Meta specifications

Title
(Critically important)
Symbolic Analysis Laboratory
The length of the page title is perfect. (264 pixels out of 580 max pixel length)
There are no duplicate words in the title
Meta description
(Critically important)
SAL: Symbolic Analysis Laboratory
The length of the meta description is perfect. (216 pixels out of 1000 max pixel length)
Crawlability
(Critically important)
There are no problems in accessing the website.
Canonical URL
(Important)
No canonical link is specified.
Language
(Somewhat important)
Language detected in text: en
Language defined in HTML: en
Server location: United States of America
The following language is defined by HTML: en
Alternate/Hreflang Links
(Somewhat important)
There are no alternate links specified on this page.
Other meta tags
(Somewhat important)
There is no rel next meta tag on this page.
There is no rel prev meta tag on this page.
Domain
(Somewhat important)
The domain is no subdomain.
The domain length is good.
The domain does not contain non-latin characters.
Page URL
(Somewhat important)
No parameters were found in the URL.
No session ID was found in the URL.
The URL does not have too many subdirectories.
Charset encoding
(Somewhat important)
The character encoding is not specified in the HTTP header.
The charset encoding (UTF-8) is set correctly.
Doctype
(Nice to have)
The doctype HTML 5 is set correctly.
The doctype is placed at first in the HTML code.
Favicon
(Nice to have)
The favicon is linked correctly.

Meta tags

NameValue
viewportwidth=device-width, initial-scale=1
authorLeonardo de Moura
descriptionSAL: Symbolic Analysis Laboratory
keywordsmodel checker, symbolic model checker, bounded model checker, formal methods, software verification, hardware verification, test-case generation, decision procedures
langen
Content-Typetext/html; charset=UTF-8
content-typetext/html; charset=UTF-8
X-UA-CompatibleIE=9

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Page quality

Content
(Critically important)
There are only 212 words on this page. Use at least 250 words to provide useful information.
34.9% of the text are stop words.
Keywords used in the page title are also used in the page content. That's good!
Words from the H1 heading are used in the page content.
The page contains a listing, which indicates a good text layout.
4 paragraphs were found on this page.
No placeholders texts or images were found.
There are no duplicates on the site.
The average number of words per sentence of 17.09 words is good.
Frames
(Critically important)
This page does not use a frameset.
Mobile optimization
(Somewhat important)
No Apple touch icon is specified.
A viewport "width=device-width, initial-scale=1" is provided.
This page does not require any JavaScript files.
Bold and strong tags
(Somewhat important)
The usage of strong and bold tags is perfect. We recommend the use of up to 6 tags for this page.
Image SEO
(Somewhat important)
Alt text (alternative text) is correctly used on all found images.
Social Networks
(Nice to have)
There are only a few social sharing widgets on the page. Make your website popular in social networks with social sharing widgets.
Additional markup
(Nice to have)
No additional page markup was found.
HTTPS
(Somewhat important)
This website uses HTTPS to protect privacy and integrity of the exchanged data.
All included files are also transferred via HTTPS.

Media list

URLAlt attributeTitle
https://sal.csl.sri.com/images/sal3.jpgSAL

Page structure

H1 heading
(Critically important)
Symbolic Analysis Laboratory
The H1 heading is perfect.
Headings
(Important)
The heading structure is perfect.

Heading structure

Heading levelContent
H1 Symbolic Analysis Laboratory
Some anchor texts are used more than once.
The number of internal links is ok.
None of the anchor texts is too long.
All internal links are not using dynamic parameters.
There are 2 external links on this page.

Found links on this page

LinkAttributesAnchor text
/index.htmlHome
/introduction.htmlIntro
/documentation.htmlDocs
/download.htmlDownload
/mailing_lists.htmlMail
http://fm.csl.sri.com/External Subdomain FM Tools
/download.htmldownload
http://sal.csl.sri.com/hybridsal/Subdomain HybridSAL
/introduction.htmlIntroduction
/documentation.htmlDocumentation
/download.htmlText duplicate Download
/mailing_lists.htmlMailing Lists and Bug Reports
http://fm.csl.sri.com/External Subdomain SRI FormalWare

Server configuration

HTTP redirects
(Critically important)
This page redirects to "https://sal.csl.sri.com/"
HTTP header
(Important)
The web server version is sent within the HTTP header.
No X-Powered HTTP header is sent.
The web server transmits the web page (HTML) in compressed form.
Performance
(Somewhat important)
The page response time of 0.54 seconds is longer than the recommended limit of 0.4 seconds. A high response time unnecessarily slows down search engine crawling and results in bad user experience as well.
This page only loads 2 CSS files. That's ok.
This page does not require any JavaScript files.
The file size of the HTML document is fine (4 kB).

HTTP Response Header

NameValue
dateMon, 12 May 2025 08:01:06 GMT
serverApache/2.4.41 (Ubuntu)
last-modifiedTue, 15 Feb 2022 01:17:52 GMT
etag"e29-5d8044d518e39-gzip"
accept-rangesbytes
varyAccept-Encoding
content-encodinggzip
content-length1599
content-typetext/html
statuscode200
http_versionHTTP/1.1

External factors

This website has excellent links from other websites.
This page has backlinks from 41 referring domains.
This page has 54 backlinks.
This page has backlinks from 41 different ip addresses.

Links from Wikipedia

No links from Wikipedia were found.

Robots.txt

No valid Robots.txt file was found.

Similar sites

Search preview

sal.csl.sri.com
Symbolic Analysis Laboratory
SAL: Symbolic Analysis Laboratory

Most important keywords

Following keywords were found. You can check the keyword optimization of this page for each keyword.

KeywordResultRecheck
Symbolic73%Check
Analysis73%Check
Laboratory73%Check
Analysis Laboratory73%Check
Symbolic Analysis Laboratory73%Check
SAL66%Check
SRI46%Check
Tools34%Check
systems34%Check
model34%Check
Show more keywords and terms

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