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.
Brian, I have a burning question regarding keyword placement and frequency. You wrote: “Use the key in the first 100 words … “. What else? I use Yoast and a WDF*IDF semantic analysis tool to check the content of the top10 rankings. Pretty often I have the feeling I overdo it, although Yoast and WDF/IDF told me I use the focus keyword not often enough.

Ahrefs boasts the best link database among any system out there. It does most everything -- link monitoring, alerts, calculated metrics, the richest clickstream blend out there, and much more. Its UI is cluttered in a good way and the company has quick and polite support. And Tim Soulo -- the public face of Ahrefs -- has done a ton of good for the SEO community. 

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.
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.
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).

In SEMrush, you can export to CSV and XLS right from Keyword Gap, Backlink Gap, Keyword Magic Tool, Keyword Difficulty Tool, Organic Traffic Insights, Bulk Analysis, Position Tracking, Ranks, Site Audit, Keyword Ad History, and PLA Research. SEO Content Template lets you export its ideas to DOC, On Page SEO checker and Log File Analyzer feature  XLS, CPC Map and PPC Keyword Tool – to CSV, and Display Advertising allows exporting to ZIP.
Another feature of Ahrefs that could potentially help you take your campaign to even better heights is their content gap feature. It gives you the option to check which keywords your competitors are ranking for so you can stay one step ahead at all times. Basically speaking, Ahrefs gives SEOs the ability to overtake their competitors through knowing which keywords to target and focus on.
Hi Anil, a fantastic post. I would like to know your opinion since in my case I do not have the budget to keep two tools at the same time. I currently use semrush since there are things that I like a lot but I have doubts about the speed of the backlink audit tool. Recently I have encountered a problem in which semrush has not detected backlinks that were potentially dangerous to my website and this has hurt me. This part worries me a little because I’ve already seen the ears of the wolf. On the price-quality ratio of the two tools, would you continue with semrush or would you go to ahrefs? Thank you very much!
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.
The Intersecting Link Opportunity report we love could offer an automatic version that takes into account the top 20 listings for a given keyword phrase, saving the researcher copy/paste time and having to run multiple requests. Their Most Popular Content list is definitely helpful, but doesn't give us the semantic relevancy we get from the intersecting report. 

Many websites rely on other traffic generation methods such as traffic from social media, email, referrals, and direct traffic sources over search engines. For sites like these, SEO errors aren’t as important because search engines aren’t their #1 traffic source. For a smaller website, a couple of errors can have a much bigger negative effect than those same errors on a larger website.
If you would like to know how to use hashtags to get popular on YouTube, you can use a useful YouTube hashtags generator like Keyword Tool. All you need to do is key in the topic related to your video in the search bar. From the results, you can select relevant, high-volume hashtags to insert in your video titles and descriptions to help people find your content.
Its interesting that you overlooked Ahrefs site audit tool. Unlike SEMRush which limits you to 20,000 URLs, Ahrefs can crawl very large websites. Their data explorer is by far the best in the business. SEMRush gives you a list of URLs with issues they want to identify. But no option to customize. Ahrefs, much easier to use and powerful Data Explorer are very powerful indeed.
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 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.
Ahrefs boasts the best link database among any system out there. It does most everything -- link monitoring, alerts, calculated metrics, the richest clickstream blend out there, and much more. Its UI is cluttered in a good way and the company has quick and polite support. And Tim Soulo -- the public face of Ahrefs -- has done a ton of good for the SEO community.
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).
You can schedule a weekly technical SEO audit and our Site Audit tool will automatically start crawling your website. You’ll get a notification when it is finished in your inbox. By running website SEO audits on a regular basis, you are tracking the progress of your website’s health. With the Compare Crawls and History reports, and mini-trends on the Overview, Issues, and Page reports, you can analyze the results of different SEO audits and track changes in the number of issues over time.
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