It gives you instant access to the following Page and Domain metrics:
Domain Rating (DR);
URL Rating (UR);
Estimated Organic Search Traffic (ST);
Number of ranking keywords (KW);
Number of referring domains (RD);
Number of backlinks (BL).
You can see all of these metrics right below every page ranking for the keyword you're searching for.
In addition to this, Ahrefs SEO Toolbar will show you the most important keyword metrics right on the SERP:
Search volume (both Global and Country-specific);
Keyword Difficulty (KD);
Cost per Click (CPC).
Installing the Toolbar
Installing the toolbar is easy.
For Chrome users, head to this link and install it.
For Firefox users, head to this link and install it.
Using the Toolbar
The SEO toolbar is a part of Ahrefs toolset. You need an active account at ahrefs.com in order to use most of the features. We also offer a few free features in our most recent Ahrefs SEO Toolbar v.2.3.0 release (scroll down to the next section for more information).
Please also note that using the SEO toolbar will spend your relevant Ahrefs account credits:
It takes one Site Explorer “Rows per month” credit to show "icon", "header" and "URL stats" in Google search. So, displaying the data for the top 10 pages in the SERP costs ten credits accordingly.
Do also note that each time the toolbar shows you keyword data, it costs you one “Rows per month” credit from the Keywords Explorer section.
No credits will be spent if you switch the toolbar to standby mode by clicking on the Ahrefs icon to the right of the address bar, then switching off the sliders "Always show metrics on pages" and "Enable SERP features"
note: The number shown on the icon is the DR of the site, and spends no credits from your account.
What features are free?
Below are some free features without Ahrefs subscription.
On-page SEO report including details about page titles, descriptions, canonicals, hreflangs, sub-headers, crawl-ability/index-ability, social tags, etc. is free. (the Content and Indexability tabs)
Broken link checker is free.
Outgoing links count is free.
If you still have issues with installing or using the toolbar, please contact Ahrefs Support for help.