If you are looking for keywords in languages other than English, you will find Keyword Tool's features very useful. Keyword Tool allows you to pull keywords from 192 Google domains and use 83 Google language interfaces to generate keyword suggestions. That way we make sure that the generated keywords will be relevant to the country and/or language that you are creating your content for.
A little expensive. Support responses can be slow. Interface can be rather confusing although they recently improved it a lot (see above re: regular updates). I couldn't get the Chrome Extension to work in any of my installations of Chrome, so I still use competitor toolbars in my browser. You can't ever change your login email address thanks to the billing system, so choose carefully.
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.
Checking a website’s on-page health is indispensable to making and keeping a website SEO- and user-friendly. Whether you manage a small website or a large one composed of thousands of webpages, detection of issues can be challenging. You just cannot afford to spend days looking for every possible mistake in the code or checking for broken images or URLs.
The Content Explorer is a nice addition for convenience, but it doesn't come close to replicating what a tool like BuzzSumo can do. Then again, it likely isn't intended to, but it's the one area of the product that feels like it might be a bit tacked on at this point. This isn't so bad though as the feature still offers a useful purpose, it's just that purpose is a little shallow.
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