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).
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 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. 

I recommend using this tool for SEO, It is a no 1 tool if you are doing SEO. If you are doing SEO without using any tool then it is very good but it takes more time and you cannot find accurate data to analyze what doing next with your site. So without wasting any time, this tool helps you to find the right keywords and give you better suggestions for your site and increase your Traffic value.
Ahref, i love teh most as it is teh most accurate keyword analysis tool, it is fast and provide you with valuable Data , so based on it you acn define your own content staretyg, without propoer planning, and Atcion plan chanecs are the data you download from arefs, would only save on your drive . Define an Action plan and use data in your inbound marketing asap you acn, it is teh only way to succeed. Best of luck
Thanks for the article, really gives some clear insights.I am currently testing out Ahref’s and have tested Moz and Semrush in the past as well. In my opinion Ahref’s UI is the best and clearest. I will have to test Moz and Semrush again i am afraid to be sure which one to start using. Have been using SE Ranking for rank tracking mostly but have noticed rank positions are not accurate most times.
Your article reaches me at just the perfect time. I’ve been working on getting back to blogging and have been at it for almost a month now. I’ve been fixing SEO related stuff on my blog and after reading this article (by the way is way too long for one sitting) I’m kind of confused. I’m looking at bloggers like Darren Rowse, Brian Clark, and so many other bloggers who use blogging or their blogs as a platform to educate their readers more than thinking about search rankings (but I’m sure they do).
Great article. Before reading this I was practically sold on SEMrush. However, after reading this article and the comments from other readers, I’m realizing I shouldn’t be so quick to pull the trigger and that Ahrefs may in fact be what I’m looking for. I will most likely do the trial period for both before deciding, but this article definitely opened my eyes to Ahrefs possibly being my best option (instead of SEMrush). Thanks for taking the time to write this article. Great work.
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).
Depending on the plan, you are only allowed up to 100 domain searches a day. If you purchase their top tier plan you only get double of that. Sometimes it can take you several days to do certain types of research. This can start to get a little bothersome as we work with several clients and all of them need to use this software to make sure everyone is getting the best work that we have to offer.
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