SherlockAds is a nice advertising intelligence tool. I like its ad analysis feature which gives a complete idea of how a particular ad is performing. It allows you to optimize and make adjustments to the ad according to you. Review collected by and hosted on G2.com.

The ad discovery feature may be limited as it may not show all the visible ads. Also, the ad analysis feature is a bit complex to understand which might make it difficult for you to advertise and improve campaigns. Review collected by and hosted on G2.com.