The backlink index is one of the best too though at the time of writing, Moz has just improved their index. Regardless of index size, which theirs is large enough, the type of data they provide is the most useful. The broken links data is probably the most useful that isn't easily matched by other tools. Additionally, going back to the content explorer, you can find unlinked mentions, a feature that appears to have been removed in Moz's "new" tool (I may just not be able to find it).
Now keep in mind that, based on their stated crawling guidelines, the stronger links from stronger sites tend to get crawled more frequently so the spammiest of the spammy link approaches might not get picked up on. For that level of deep research a historical report from Majestic SEO and a link status checker, like Advanced Link Manager, is likely a better bet.

Competitor backlink audit – Analyse the link profile of your competitor and research the opportunities, to match your, or even better outperform your competitors link profile and subject authority. When performing an competitor backlink audit you should also analyse inbound links pointing to top performing pages, so you don’t miss out on valuable link opportunities.
Thanks so much for offering this helpful tool. It is very useful. In case you want feedback, I think it would be great if you could please also consider including another column to display the linked page (i.e., the actual page that the backlink goes to on the domain). When selecting “All pages on this domain” it is difficult to know which page each backlink is going to on the domain. Thanks for your consideration.
Thank you for the great checklist. It is really useful and gave us a couple of new hints on optimization process. We’ve been using WebSite Auditor and found it exremely helpful in site’s structure and content analysis, bringing all the statistical information on the validation errors, social mentions, duplicate stuff, etc. under one roof. Still there is so many different SEO information you sometimes cannot understand what to start with. Fortunately you answered this question. Thank you again!
Detailed breakdown of all our key SEO metrics and performance history. It's very easy to compare our performance against competitors, and identify new opportunities to improve. The "link intersect" tool is amazing! You can easily see who's linking to your competitors and not your site, and work through the report list to build your presence on those domains.
If you're okay with the pricing they offer – Ahrefs is the perfect solution for any content creators out there. You are able to step up your SEO game with data on number of backlinks as well as info on that particular site. But before you start using Ahrefs, try out what Google already offers first, maybe it will be enough for you in the beginning.
Utilize the "broken backlink" section. Utilize the ability to isolate lost and gained links by date. Let's say you have drops around October. You could go to right before that and specifically isolate good links lost or bad links gained, etc. They also have a good amount of helpful online resources for learning how to use the tool. Great graphs show overall trends for linking domains or linking pages. Check out the ability to sort by AHREFS' quality statistics to help analyze quality/low quality links.
As of September 2014, YouTube's own keyword tool stopped working. It was moved over to Display Planner's AdWords video keyword suggestions. To use it, you need to have an Google Ads account. Just like the non-existent YouTube keyword tool, it was created to facilitate paid video and ads promotion. Which is why keywords that you will find there might not be closely related to the topic that you want to cover.
The audit is for all pages and not only one. What happens in the majority of the cases is that pages / posts have similarities so you can group them together. For example the pages of a website may be ok but the blog post pages may be missing titles. It’s a lot of work especially for a 500 pages website but you can start from the most important pages first and work your way to the rest
Keyword Tool is the best YouTube keyword tool alternative. It uses YouTube autocomplete feature to generate highly relevant long-tail keywords about a particular topic. YouTube autocomplete, just as Google autocomplete, was created to make the user experience better. It helps users find videos faster by recommending related keywords when they start typing in their search query.

Google’s bots crawl your site to determine its quality, and correct technical on page optimization is one of the main signals used. When you optimize your page based on the recommendations of the website analyzer, you can increase your organic traffic, improve ranking positions, and stay competitive against other sites ranking for your target keywords. 

The thing that I liked the best about Ahrefs is that it contains a huge database of backlinks when I've checked my own website and my competitor's websites. This has allowed me to dig deeper and find out their exact linkbuilding and SEO strategies. Ahref contains a lot of tools and features that will make the life of an SEO professional or webmaster who wants more search engine traffic a lot easier. One of these features is the batch analysis feature. Basically, instead of entering your competitor's backlinks one at a time you could actually enter it once. This allows you to quickly check on the SEO metrics for a lot of competitor URLs in just one click.
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