An IAB Tech Lab standard that lets app publishers declare which ad networks are authorized to sell their inventory.

Where do I put the app-ads.txt file?

At the root of the developer website listed in your App Store / Google Play page, e.g. https://studio.com/app-ads.txt.

What is a Certification Authority ID?

An optional TAG-ID of the ad system, the 4th field of an app-ads.txt record.

gamesofa.com achieves the best ad optimization: its app-ads.txt has no errors and matches what its 2 ad networks expect (100% of 2 lines).

Checked 19 Oct 2026. 9 lines, 7 unique records, 2 duplicates, 0 invalid lines, 2 ad networks detected.

Google AdMob — account pub-7804517509969255: 1 line in the file
Meta Audience Network — accounts 733032473454768, 450712818940698, 1652877995069690 and 3 more: 6 lines in the file

Yes — https://gamesofa.com/app-ads.txt has 9 lines (checked 19 Oct 2026).

Its app-ads.txt lists Google AdMob, Meta Audience Network.

gamesofa.com achieves the best ad optimization: its app-ads.txt has no errors and matches what its 2 ad networks expect (100% of 2 lines).