Are the free ad libraries enough for creative research?
For a single-channel advertiser, usually yes. Meta Ad Library, Google's Transparency Center, and TikTok Creative Center show live ads from any competitor on their platforms, which covers the core research loop. Paid tools earn their fee when you need cross-network views, historical archives, engagement estimates, product-level ecommerce data, or app network coverage that the libraries do not provide.
How do I judge whether a competitor ad is actually working?
Longevity and iteration are the reliable signals. An ad that has run for weeks or months keeps earning its budget, and a concept the advertiser keeps producing variations of is a concept that converts. Single fresh ads prove nothing, since most ads fail. Paid tools add engagement and spend estimates, but treat those as directional, not as measurement.
Is it legal and ethical to use ad spy tools?
Researching publicly visible ads is standard competitive practice, and the official libraries exist precisely for transparency. The line is copying: using competitor research to understand hooks, formats, and offers is fine, while reproducing someone's creative or trademarked assets invites legal and platform consequences. Study mechanics, then make original work.