MozBar has been around for years and remains one of the most recognisable browser extensions in SEO. Its primary function is overlaying Moz’s Page Authority and Domain Authority metrics onto search results and individual URLs, which gives you a quick proxy for how strong any given page or domain is likely to be in competitive terms.
The free tier is genuinely useful, particularly for those who use Moz metrics in their reporting or client conversations. You can see DA and PA at a glance as you browse, compare page metrics across search results, and access basic on-page data like title tags, meta descriptions, and heading counts. For quick site assessments, the free MozBar covers a lot of ground.
I’ll be honest that PA and DA have limitations as metrics. They’re Moz’s proprietary scores rather than actual Google signals, and their correlation with real rankings varies. That’s not unique to MozBar, it applies to all tools using these metrics, but it’s worth keeping in mind when presenting this data to clients. The Pro tier unlocks more detailed on-page analysis, keyword difficulty data, and full link metrics. At $99 per month, the MozBar Pro tier is part of a broader Moz Pro subscription rather than a standalone purchase, so you’re evaluating the whole platform as much as the toolbar.