One of the most visited posts on this blog is a post on tools to spy on competitors websites. As this apparently is a hot topic, I will share three more free tools that I visit frequently online, either to:

1. check on backlinks of my or other peoples’ websites
2. see quickly which Google ads are being displayed for a certain (set of) keywords, per country
3. ’study’ the ads and keywords that other affilates are using, per domain, or per keyword !

Number three returns only ten results in the free version, but is still very interesting to do a quick research on new projects you are considering. Take the displayed numbers more as a direction than as an exact result though …

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