What each library shows
The Meta Ad Library is the most useful: every active ad with its start date, formats and placements. Sort by longest running to find proven creative. The Google Ads Transparency Center lists Search, YouTube, Display and Shopping ads by advertiser, with a date range. TikTok's Creative Center ranks top ads by region with click-through and view rates. The TikTok Ad Library is the official archive for the EU, UK and Switzerland. LinkedIn's Ad Library covers every ad since June 2023.
A 15-minute competitor check
Search three competitors on Meta. Note which ads have run for more than 60 days, what offer they lead with and whether they use video, static or carousel. Repeat on Google for their search ads and the keywords they are bidding on. That is enough to brief your first round of creative. We do this at the start of every account we take on.