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.

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

Checked 21 Oct 2026. 33 lines, 32 unique records, 0 duplicates, 0 invalid lines, 6 ad networks detected.

Meta Audience Network — accounts 747980595641725, 450687915521028, 531176137608018 and 4 more: 7 lines in the file
Google AdMob — account pub-4340725720762012: 1 line in the file
TikTok Ad Network (Pangle) — accounts 80271, 9898: 2 lines in the file
PubMatic — account 160565: 1 line in the file
Mintegral — partner (reseller) lines only: 13 lines in the file, 400 expected lines missing
Yango Ads — partner (reseller) lines only: 14 lines in the file, 400 expected lines missing

Yes — https://kwread.com/app-ads.txt has 33 lines (checked 21 Oct 2026).

Its app-ads.txt lists Meta Audience Network, Google AdMob, TikTok Ad Network (Pangle), PubMatic, Mintegral, Yango Ads.

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