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.
Another function included in the backlink profile section is the data for Referring Domains. Basically speaking, it shows you the number of websites that are linking to the domain you’ve inputted in the search bar. So, in this instance, I’m using seo-hacker.com as the target website/URL, and the number of referring domains is shown with the corresponding details you will ever need:
The library and crawl index for Ahrefs is unparalleled. If you need to know competitive landscape and build backlinks, there is not another player in this space. moz, etc doesn't come anywhere close. they do alright in other factors, but purely from a research and backlink profile perspective Ahrefs is the leader without competition. Comparison features and backlink tracking are indispensable. Good to help with estimation of traffic on potential client's websites. You can go to the table in a client meeting better prepared. This along with SEO powersuite makes a good package. 

SERP overview reports the top 10 results for a keyword, their key metrics like UR, DR, backlinks, traffic, and social shares. Shockingly enough, the Ahrefs also reports if there are any AdWords ads, knowledge graph, and snippets at the top of the SERP for the keyword. This is very helpful in manually analyzing whether it is possible for you to rank for the keyword.
Competitor Backlink Audit: Analyze the link profile of your competitors and look for opportunities that can help improve your own link building and search performance. Whenever you perform a competitor backlink check or audit, you must also check the inbound links that are pointing to top ranking pages so you wouldn’t miss out on important link opportunities.
Like all backlink monitors, it doesn't pick up anywhere near all backlinks and is slow to pick up new backlinks. However, all backlink tools have this same problem and Ahrefs is the best of those tools. One of my biggest gripes is that Ahrefs drops backlinks and count them as a lost domain, but after looking into the dropped campaigns you find that a majority of them are still there and Ahrefs dropped them from your backlink profile for an unknown reason. 

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.
This report can help you reverse engineer, down to the day, a link building campaign that your competitor is running (always good to be out in front of a big link push by a competitor) and can also help you evaluate your own link campaign or even help you spot a link growth issue that may have resulted in some kind of penalty or over-optimization filter.
One thing I like about Ahrefs is that it's straight and to the point. It's very easy to get in, get your data, and get out. Each report does pretty much what you expect it to. This report shows the referring domains + number links coming from that domain. You can access the links from each domain by clicking the Expand button next to the referring domain:

With Ahrefs, users get the best backlink checking platform in the industry. With just a few clicks of the button, users have a crystal clear profile of any website or URL. From links to anchors as well as the strength of the backlinks, Ahrefs reveals them all in an instant. Users can also monitor backlinks and follow their growth overtime and deploy smart filters and advanced reporting features to quickly discover relevant data.

SEOptimer is a free SEO Audit Tool that will perform a detailed SEO Analysis across 100 website data points, and provide clear and actionable recommendations for steps you can take to improve your online presence and ultimately rank better in Search Engine Results. SEOptimer is ideal for website owners, website designers and digital agencies who want to improve their own sites or theirs of their clients.
We're using Ahrefs to drive our entire approach to SEO. It's Keywords Explorer tool is more accurate and does a better job of uncovering related terms and ideas than another platform we were using previously. This has enabled us to better validate our content ideas and improve our keyword research than before, and the benefits have been measurable.
Ahrefs is an excellent tool for SEO and Content Marketing. However, it may not fit those who have a low budget, are casual bloggers or those trying to start a new niche. This is also not for webmasters who don't do frequent updates. Ahrefs is not cheap. But, with its ability to replace many tools and its unique functions, it can be worth the investment.
Ahrefs make use of two link updates in your website - the Fresh Index and the Live Index. Fresh Index which updates at a longer time frame. It shows the dead links on your website, giving you the chance to change or reclaim the dead link. The Live Index, on the other hand, makes link updates every 15-30 minutes. This provides you with the chance to see regular link updates on your website.

SEOptimer is a free SEO Audit Tool that will perform a detailed SEO Analysis across 100 website data points, and provide clear and actionable recommendations for steps you can take to improve your online presence and ultimately rank better in Search Engine Results. SEOptimer is ideal for website owners, website designers and digital agencies who want to improve their own sites or theirs of their clients. 

Ahrefs also helps users dig deep into their competitors’ search traffic with the Positions Explorer tool. You can easily see the keywords the competition is ranking for in the search engines as well as the keywords they are spending on for their advertising and marketing campaigns. Even better, you can see the flow of organic and paid traffic they are receiving.
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.
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