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.

ins-mate.firebaseapp.com achieves the best ad optimization: its app-ads.txt has no errors and matches what its ad network expects (100% of 1 line).

Checked 19 Oct 2026. 22 lines, 20 unique records, 0 duplicates, 0 invalid lines, 2 ad networks detected.

Google AdMob — account pub-5490912237269284: 1 line in the file
DSP Exchange — partner (reseller) lines only: 11 lines in the file, 400 expected lines missing

Yes — https://ins-mate.firebaseapp.com/app-ads.txt has 22 lines (checked 19 Oct 2026).

Its app-ads.txt lists Google AdMob, DSP Exchange.

ins-mate.firebaseapp.com achieves the best ad optimization: its app-ads.txt has no errors and matches what its ad network expects (100% of 1 line).