Website review lean-lang.org
Lean Programming Language
Generated on March 11 2026 01:15 AM
Old data? UPDATE !
The score is 55/100
SEO Content
Title
Lean Programming Language
Length : 25
Perfect, your title contains between 10 and 70 characters.
Description
Lean is an open-source programming language and proof assistant that enables correct, maintainable, and formally verified code.
Length : 127
Great, your meta description contains between 70 and 160 characters.
Keywords
Very bad. We haven't found meta keywords on your page. Use this free online meta tags generator to create keywords.
Og Meta Properties
Good, your page take advantage of Og Properties.
| Property | Content |
|---|---|
| title | Lean Programming Language |
| type | article |
| image | https://lean-lang.org/static/png/banner.png |
| url | https://lean-lang.org |
| image:alt | Lean Programming Language |
| site_name | Lean Language |
Headings
| H1 | H2 | H3 | H4 | H5 | H6 |
| 3 | 9 | 8 | 0 | 0 | 0 |
- [H1] Lean in Action
- [H1] Sponsors and Partners
- [H1] Get Started with Lean
- [H2] Cedar
- [H2] Mathlib
- [H2] Aeneas
- [H2] Fermat's Last Theorem
- [H2] Terence Tao
- [H2] Byron Cook
- [H2] Pushmeet Kohli
- [H2] Tudor Achim
- [H2] Emina Torlak
- [H3] Trustworthy
- [H3] Powerful
- [H3] Extensible
- [H3] Get Started
- [H3] Documentation
- [H3] Resources
- [H3] FRO
- [H3] Policies
Images
We found 13 images on this web page.
Good, most or all of your images have alt attributes.
Text/HTML Ratio
Ratio : 9%
This page's ratio of text to HTML code is below 15 percent, this means that your website probably needs more text content.
Flash
Perfect, no Flash content has been detected on this page.
Iframe
Great, there are no Iframes detected on this page.
SEO Links
URL Rewrite
Good. Your links looks friendly!
Underscores in the URLs
Perfect! No underscores detected in your URLs.
In-page links
We found a total of 22 links including 0 link(s) to files
| Anchor | Type | Juice |
|---|---|---|
| Install | Internal | Passing Juice |
| Learn | Internal | Passing Juice |
| Community | Internal | Passing Juice |
| Use Cases | Internal | Passing Juice |
| FRO | Internal | Passing Juice |
| Playground | Internal | Passing Juice |
| Reservoir | Internal | Passing Juice |
| About | Internal | Passing Juice |
| Team | Internal | Passing Juice |
| Roadmap | Internal | Passing Juice |
| Contact | Internal | Passing Juice |
| Language reference | Internal | Passing Juice |
| Lean API | Internal | Passing Juice |
| FAQ | Internal | Passing Juice |
| Cite Lean | Internal | Passing Juice |
| VS Code extension | External | Passing Juice |
| Loogle | Internal | Passing Juice |
| Mathlib | External | Passing Juice |
| Roadmap | Internal | Passing Juice |
| Privacy Policy | Internal | Passing Juice |
| Terms of Use | Internal | Passing Juice |
| Lean Trademark Policy | Internal | Passing Juice |
SEO Keywords
Keywords Cloud
mathematics cedar verification language grind lean theorem prime factorial leans
Keywords Consistency
| Keyword | Content | Title | Keywords | Description | Headings |
|---|---|---|---|---|---|
| lean | 23 |  |
 |
|
|
| grind | 13 | |
|
|
|
| leans | 9 | |
|
|
|
| mathematics | 8 | |
|
|
|
| prime | 8 | |
|
|
|
Usability
Url
Domain : lean-lang.org
Length : 13
Favicon
Great, your website has a favicon.
Printability
We could not find a Print-Friendly CSS.
Language
Good. Your declared language is en.
Dublin Core
This page does not take advantage of Dublin Core.
Document
Doctype
HTML 5
Encoding
Perfect. Your declared charset is UTF-8.
W3C Validity
Errors : 0
Warnings : 0
Email Privacy
Great no email address has been found in plain text!
Deprecated HTML
Great! We haven't found deprecated HTML tags in your HTML.
Speed Tips
|
Excellent, your website doesn't use nested tables. |
|
Perfect. No inline css has been found in HTML tags! |
|
Too bad, your website has too many CSS files (more than 4). |
|
Too bad, your website has too many JS files (more than 6). |
|
Perfect, your website takes advantage of gzip. |
Mobile
Mobile Optimization
|
Apple Icon |
|
Meta Viewport Tag |
|
Flash content |
Optimization
XML Sitemap
Missing
Your website does not have an XML sitemap - this can be problematic.
A sitemap lists URLs that are available for crawling and can include additional information like your site's latest updates, frequency of changes and importance of the URLs. This allows search engines to crawl the site more intelligently.
Robots.txt
https://lean-lang.org/robots.txt
Great, your website has a robots.txt file.
Analytics
Missing
We didn't detect an analytics tool installed on this website.
Web analytics let you measure visitor activity on your website. You should have at least one analytics tool installed, but It can also be good to install a second in order to cross-check the data.
PageSpeed Insights
Device
Categories
Free SEO Testing Tool
Free SEO Testing Tool is a free SEO tool which provides you content analysis of the website.