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.

develup.com.ar achieves the best ad optimization: its app-ads.txt has no errors and matches what its 4 ad networks expect (100% of 5 lines).

Checked 19 Oct 2026. 211 lines, 112 unique records, 66 duplicates, 0 invalid lines, 9 ad networks detected.

Google AdMob — accounts pub-7889279267679523, pub-1912561085588771: 2 lines in the file
Smaato — account 1100049717: 1 line in the file
Amazon Publisher Services — account 4068f24a-bd2b-427b-85be-bb69ba6444f1: 1 line in the file
Xandr (Microsoft) — accounts 12096, 12406: 2 lines in the file
Mintegral — partner (reseller) lines only: 15 lines in the file, 400 expected lines missing
Chartboost — partner (reseller) lines only: 17 lines in the file, 400 expected lines missing
Yango Ads — partner (reseller) lines only: 27 lines in the file, 400 expected lines missing
DSP Exchange — partner (reseller) lines only: 39 lines in the file, 400 expected lines missing
Bidmachine — partner (reseller) lines only: 27 lines in the file, 400 expected lines missing

Yes — https://develup.com.ar/app-ads.txt has 211 lines (checked 19 Oct 2026).

Its app-ads.txt lists Google AdMob, Smaato, Amazon Publisher Services, Xandr (Microsoft), Mintegral, Chartboost, Yango Ads, DSP Exchange, Bidmachine.

develup.com.ar achieves the best ad optimization: its app-ads.txt has no errors and matches what its 4 ad networks expect (100% of 5 lines).