The algorithm eats creatives faster than most teams can feed it. Pull four numbers from the Meta Ad Library, yours or any competitor's, and get an honest fatigue score in thirty seconds.
The Meta Ad Library is public. Open it here, search the page, and read the three numbers below straight off the results.
The big results count top-left of the Ad Library results page, for example "~14 results".
Each ad card shows a "Started running on" date. Count the ones dated inside the last 30 days.
Scroll to the last card, find the earliest "Started running on" date, and count the days since.
How we score. Accounts spending $10k to $50k a month need roughly 12 fresh creatives a month to keep feeding the algorithm; under $10k needs about 6, $50k to $200k about 25, and $200k+ about 40. The score weighs your launch velocity against that benchmark (60%), how long your oldest ad has been carrying the account (25%), and how thin your active set is (15%). A proven evergreen winner can run long, but if the oldest ad is also most of the spend, that is fatigue waiting to happen.