The errors in technical SEO are often not obvious, and therefore one of the most popular. Mistakes in robots.txt and 404 pages, pagination and canonical URLs, hreflang tags and 301 redirects, http vs https and www vs non www versions: each of them can seriously spoil all efforts to promote the site. One quality SEO website analysis is enough to solve all the main problems in this part forever.
As a long time Moz user and I might even say a super fan of their product, it feels really odd to be writing a review of Ahrefs. But here we go--I love Ahrefs. The design, the UI, the gigantic keyword database and now the newly redesign site audit are a thing of beauty. I continue to be impressed by the data they provide, features that are added frequently and my favorite feature has to be the top pages report. (Not sure why I love that so much--but it just makes it extremely simple to research a site or competitor with that report.)
The Lost Links tab has the same interface as the New Links report does. For your own domain you might want to consider tracking your own links in something like Raven or Buzzstream but this tool does report dropped links down to the day. Combine that with their crawling preferences (better links = quicker attention) and you can spot drops of substance quickly.
The tool is quite easy to use and it does pretty much what you expect it to. If you are into link research you should give this tool a try. The database appears to be a fairly good size for a new database and the ability to slice and dice that data from right within the web interface is a solid feature. If you do try it out, let us know what you think! We are also adding their link data to SEO for Firefox & the SEO Toolbar today.
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.
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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