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.

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

Checked 20 Oct 2026. 71 lines, 55 unique records, 0 duplicates, 0 invalid lines, 3 ad networks detected.

Google AdMob — accounts pub-2335763024933651, pub-9378724246417115, pub-4338256439626145 and 4 more: 7 lines in the file
Yahoo — account 59109: 1 line in the file
Xandr (Microsoft) — account 9393: 1 line in the file

Yes — https://video.friday.tw/app-ads.txt has 71 lines (checked 20 Oct 2026).

Its app-ads.txt lists Google AdMob, Yahoo, Xandr (Microsoft).

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