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.

docutain.de 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 20 Oct 2026. 63 lines, 62 unique records, 0 duplicates, 0 invalid lines, 9 ad networks detected.

Google AdMob — accounts pub-4328756004382032, pub-3940256099942544: 2 lines in the file
Meta Audience Network — account 202649320343452: 1 line in the file
Mintegral — partner (reseller) lines only: 16 lines in the file, 400 expected lines missing
Chartboost — partner (reseller) lines only: 11 lines in the file, 400 expected lines missing
BIGO Ads — partner (reseller) lines only: 11 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: 11 lines in the file, 400 expected lines missing
Verve (PubNative) — partner (reseller) lines only: 14 lines in the file, 400 expected lines missing
Bidmachine — partner (reseller) lines only: 18 lines in the file, 400 expected lines missing

Yes — https://docutain.de/app-ads.txt has 63 lines (checked 20 Oct 2026).

Its app-ads.txt lists Google AdMob, Meta Audience Network, Mintegral, Chartboost, BIGO Ads, Yango Ads, DSP Exchange, Verve (PubNative), Bidmachine.

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