ChatGPT sells ads in 40 countries but publishes no ad library. PromptAds is a free Chrome extension that logs every sponsored ad ChatGPT shows you (advertiser, creative, destination, format), keeps it local, exports to CSV, and lets you contribute, strictly opt-in, to the European ChatGPT Ad Library: a public record of who advertises in ChatGPT, built by real users. Never your conversations, no IPs stored. This tool is built for marketeers and agencies who are serious about ChatGPT Ads.