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.

mermaid-coloring-book.web.app app-ads.txt check

mermaid-coloring-book.web.app 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 19 Oct 2026. 2 lines, 2 unique records, 0 duplicates, 0 invalid lines, 2 ad networks detected.

Ad networks in mermaid-coloring-book.web.app/app-ads.txt

Google AdMob — account pub-4987458983195638: 1 line in the file
Meta Audience Network — account 214197133309313: 1 line in the file

Corrected file: mermaid-coloring-book.web.app app-ads.txt (fixed).

FAQ

Does mermaid-coloring-book.web.app have an app-ads.txt?

Yes — https://mermaid-coloring-book.web.app/app-ads.txt has 2 lines (checked 19 Oct 2026).

Which ad networks does mermaid-coloring-book.web.app work with?

Its app-ads.txt lists Google AdMob, Meta Audience Network.

Is the app-ads.txt of mermaid-coloring-book.web.app correct?