Free SEO Tools

Many of these tools have advanced versions that are accessible with a coupon code only. If this feature is available, you will be prompted for the code before you run the tool.

On Site Optimization Tools

Duplicate Content Tool
The most comprehensive web-based duplicate content tool available online. This tool checks 7 different common causes and effects of duplicate content to diagnose any current or potential duplicate content penalties.

WWW vs Non WWW Tool
Determine whether you should use the www. or non www version of your domain as the canonical version based on your external link profile.

LDA Content Optimizer
This tool determines your onTopic score for a particular URL and keyword. The tool then spiders your page and top ranking pages for that keyword to determine colocated terms that you have not included in your page. The tool then re-checks your LDA score if you were to include those keywords on your page to determine the potential increase in relevancy.

Second Page Poaching API
A free API for taking advantage of Virante's Second Page Poaching technique to lift long-tail terms from Page 2 to Page 1.

Duplicate Content Checker by Title Tool
Diagnosis non-standard duplicate content issues by brute-force checking of search engine results based on identical title tags.

Theme Keyword Finder Tool
A different approach for creating more thematic content, this tool diggs through your competitor's websites to determine common words and phrases they use throughout their text. Use those words to make your content match the themes of your industry more closely.

Density of Keyword Tool
Unlike other live keyword density tools, this performs "phrase density" measurements, so two, three and four word combinations are compared not against the regular word count, but against all other two, three, and four word combinations. This gives you a more accurate measurement of density.

Off Site Optimization Tools

PageRank Recovery Tool
Many sites lose a lot of potential PageRank because sites link to incorrect URLs. This tool helps you find them and automatically generate the 301 redirects you need to recover that PageRank.

Link Atrophy Diagnostic Tool
Identify the rate of top link atrophy on your site. If your top links are being removed at a high pace, you won't see positive rankings. Powered by SEOMoz Labs.

Competitive Analysis Tool
SEO is a competition. You have to be more popular and more relevant than your competitors to succeed. Just type in your keyword and the page you want to rank so you can compare yourself to your top competitors.

Link Proximity Analysis
Compare a website's link graph to Wikipedia's based on the proximity of their backlinks to other backlinks on the linking page.

Link Depth Analysis
Compare a website's link graph to Wikipedia's based on the average hierarchical depth of the backlink source URLs.

Multiple Links Analysis
Compare a website's link graph to Wikipedia's based on the number of other links to the same domain on the backlink source pages.

Link Hub Finder
Get links from the same sources as your competitors. Find niche linking sites that provide valuable thematic links.

Banned Sites Tool
Utilizing the brand new linkfromdomain: command in MSN, this tool finds the top 100 outbound links on your site and determines whether or not those sites are banned. If they are, it gives you the link to MSN where you can find exactly what pages on your site link to the banned domain!

Reciprocal Linking Tool
Also taking advantage of the brand new linkfromdomain: command in MSN, this tool identifies which of the top 100 outbound links on your site go to reciprocating web sites. If they are not reciprocating, their domains are listed. Many of these tools have advanced versions that are accessible with a coupon code only. If this feature is available, you will be prompted for the code before you run the tool.

Other Tools

Google Double Listing Demystifier
When a domain gets 2 or more listings in the top 10, Google automatically moves the second listing directly under the first with an indent. Unfortunately, you don't know exactly where the 2nd listing ACTUALLY ranks. Is it vulnerable in position 10? Or does it really rank #4? Use this tool to find out!

Adwords Creatives Tool
Test your Adwords Creatives (advertisements) in advance.

HTML Pie Chart Tool
Easily the most difficult and coveted chart to get into HTML, this tool will help you generate an pie chart on-the-fly for your web site.

Clean IP Tool
Because your site can be associated with other sites sharing the same IP address, it is important to know how "clean" the content is of sites sharing your ip. Are they adult sites? Or Gambling Sites? This tool finds your ip and checks other sites that share the ip for a cross section of adult, gambling, and pharmaceutical terms which could damage your search rankings.

IP Information Lookup Tool
Grab the GeoLocation, Arin Whois, and MSN IP site reverse-lookup all at once!

IP Address Finder Tool
Find the IP addresses of a list of several websites. Just list websites 1 per line.

Delete Duplicates Tool
Enter in a huge list of keywords or data and immediately get back a list with duplicate entries removed.

HTTP Headers Check Tool
Enter the domains you wish to check, and receive the HTTP status codes in return.