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.

twitpane.com achieves the best ad optimization: its app-ads.txt has no errors and matches what its 2 ad networks expect (100% of 3 lines).

Checked 20 Oct 2026. 165 lines, 144 unique records, 3 duplicates, 0 invalid lines, 5 ad networks detected.

Google AdMob — account pub-2278900847271821: 1 line in the file
Amazon Publisher Services — accounts 4010, c860f301-6ab8-4e1e-a608-ca8c3dfcc339: 2 lines in the file
Mintegral — partner (reseller) lines only: 28 lines in the file, 400 expected lines missing
Unity Ads — partner (reseller) lines only: 11 lines in the file, 149 expected lines missing
Yango Ads — partner (reseller) lines only: 29 lines in the file, 400 expected lines missing

Yes — https://twitpane.com/app-ads.txt has 165 lines (checked 20 Oct 2026).

Its app-ads.txt lists Google AdMob, Amazon Publisher Services, Mintegral, Unity Ads, Yango Ads.

twitpane.com achieves the best ad optimization: its app-ads.txt has no errors and matches what its 2 ad networks expect (100% of 3 lines).