You can see every active ad your competitors are running, for free, because the platforms are required to publish them. The Meta Ad Library shows every live Facebook and Instagram ad from any advertiser. The Google Ads Transparency Center shows a verified advertiser's ads across Search, YouTube, Display and Gmail. The TikTok Creative Center goes one better and shows top-performing TikTok ads sortable by CTR and reach, the only free library with an actual performance signal. The LinkedIn Ad Library covers every LinkedIn ad run since June 2023. No spy tool subscription required.
The catch is that "seeing the ads" and "knowing which ads work" are different problems. The libraries mostly show you what is running, not what is profitable, so the skill is reading the signals: how long an ad has been live, how many variants exist, and what survives month to month. An ad that has run for 90 days or more is almost certainly paying for itself, and that one heuristic turns a wall of creative into a shortlist of proven angles.
This guide walks through each free library in turn, exactly what you can and cannot see in 2026, including the EU transparency extras most people miss. Then it covers the research layer the spy tools never give you: mining competitor reviews for positioning and copy, now fast enough with AI to do in an evening. It is written for a founder doing their own marketing, probably at 11pm, who would rather spend the spy tool money on actual ads.