Ahrefs

What it does

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Ahrefs is best known for one of the largest backlink databases in the SEO industry. A marketer can enter any domain and see who links to it and which pages attract the most links — useful for checking a site's own authority and scouting competitors.

Beyond backlinks, it covers keyword research with volume and difficulty scores, a site audit crawler, and rank tracking over time. What sets it apart is data freshness and crawl frequency more than unique features.

There's a genuine free product, Ahrefs Webmaster Tools, but it only works on sites you've verified ownership of. The paid product has no free trial.

Who this helps

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An SEO specialist or agency who relies heavily on backlink data and link-building research.

A site owner who wants a free, ongoing technical audit of their own domain.

An agency comparing SEO tools that wants the most current backlink index available.

Someone who already knows they need this depth, since there's no easy free trial.

Free tier:

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Yes — Ahrefs Webmaster Tools is free for verified site owners, covering site audit and backlink data for your own domains. No card required for this. The paid product has no free trial.