One thing I don't like is that Ahrefs sometimes does not provide exact keyword search volume. Instead – it provides approximate numbers which confuses us in cases when we think a keyword should get more traffic that it actually does once the SEO content is published. To get the most up to date and exact numbers, you'd better off use Google's keyword planner.
Lite allows you to have a 7 day trial for $7. After the trial ends, it costs $99 per month or $990 per year. This plan allows you to track up to 5 projects (websites) and track 500 keywords per project. You can search 25 batches of keywords per day, but you can search up to 10,000 keywords per batch. I like to use it to search multiple ideas for long tail keywords at once so I don't use up all my searches.

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.
Thank you for the great checklist. It is really useful and gave us a couple of new hints on optimization process. We’ve been using WebSite Auditor and found it exremely helpful in site’s structure and content analysis, bringing all the statistical information on the validation errors, social mentions, duplicate stuff, etc. under one roof. Still there is so many different SEO information you sometimes cannot understand what to start with. Fortunately you answered this question. Thank you again!
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).
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.
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.
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.