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10 Website Checker Tools to Audit Your SEO
1) Google Webmaster Tools

Cost: Free

Perhaps the best way to understand the way Google sees your site is to ask Google. Google’s Webmaster Tools are novice-friendly resources that explain the fundamentals of Google search.

For example, Google’s Fetch as Google tool allows you to see a particular URL as Google sees it, which is critical when troubleshooting for poor SEO performance. The information returned can help you modify the page in question for better results, and can even help you isolate problematic code when you believe your site's been hacked.

2) Check My Links

Cost: Free

To ensure that your links on a webpage -- whether external or internal -- actually work, check out Check My Links.

This broken link checker makes it easy for a publisher or editor to make corrections before a page is live. Think about a site like Wikipedia, for example. The Wikipedia page for the term "marketing" contains a whopping 711 links. Not only was Check My Links able to detect this number in a matter of seconds, but it also found (and highlighted) seven broken links.

3) Moz Pro Tools

Cost: Free 30-day trial, then paid plans from $99/mo - $599/mo

The Moz Pro subscription serves as an all-in-one tool for increasing your business' search ranking. Moz's collection of research tools provides subscribers with the resources they need to identify SEO opportunities, track growth, build reports, and optimize their overall efforts.

For example, the Crawl Test tool employ's Moz's own web crawler, RogerBot, to analyze up to 3,000 links on a given URL. Once completed, users then receive an email report that details the data for each page the site links to.

4) SEO Report Card

Cost: Free

SEO Report Card by UpCity lets you analyze your website to determine how it stacks up against your competitors.

In exchange for a bit of your contact information, SEO Report Card will serve up a report that covers the following:

Rank Analysis. A snapshot of where your website ranks on Google, Yahoo, and Bing! Your ranking is based on the main keyword you selecting when putting information in to build the report.
Link Building. A detailed account of the number of websites that link back to your site.
On-Site Analysis. A look at how successful you were in incorporating your main keyword throughout your site.
Website Accessibility. A section focused on your site's load time and ease of accessibility for crawlers.
Trust Metrics. An overview of your site's level of trust or authority.
Current Indexing. An indication of how many of your site pages have been indexed.

5) HubSpot's Website Grader

Cost: Free

Back in 2007, HubSpot released a tool called Website Grader that helped businesses uncover search engine optimization opportunities. Since a lot has changed since then, they recently released a new and improved version of the tool.

6) Woorank

Cost: Free 14-day trial, then $49/mo for a Pro Plan or $149/mo for a Premium Plan

Woorank's in-depth site analysis helps marketers reveal opportunities for optimization and improvement. This analysis takes into account the performance of existing SEO initiatives, social media, usability, and more.

7) Screaming Frog SEO Spider

Cost: The Screaming Frog SEO Spider LITE version is free (with limitations*), and the paid plan is $160/year

The Screaming Frog SEO Spider is a search marketer's best friend.

Designed specifically for the SEO-minded, this program crawls the websites you specify, examining the URLs for common SEO issues. This program simplifies and expedites an otherwise time-consuming process -- especially for larger websites. It could take hours or days to manually evaluate the same URLs.

8) Found's SEO Audit Tool

Cost: Free

Want to rise above your competitors on search engine results pages?

(Who doesn't?)

The SEO Audit Tool by Found is an easy-to-use tool for marketers looking to identify (and solve) common SEO errors on a website.

9) Remove'em

Cost: $249 per domain or a subscription option starting at $99/mo

Have you ever purchased links? Spammed the comments section on a string of blogs using the same message and link? If so, we'll forgive your bad judgment just this once ... but Google won't.

10) Varvy's SEO Overview Tool

Cost: Free

This SEO auditing tool provides users with information regarding their domain strength, links, image SEO, social counts and mentions, page/technical SEO, page speed, and more.

The comprehensive report is prepared in less than a minute, and dives deep into different aspects of your website's performance. You'll notice that the tool employs green checks, red Xs, and yellow exclamation points to denote the severity of the issue.