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.

narrowfront.matterwardlabs.com app-ads.txt check

narrowfront.matterwardlabs.com achieves the best ad optimization: its app-ads.txt has no errors and matches what its ad network expects (100% of 1 line).

Checked 19 Oct 2026. 2 lines, 2 unique records, 0 duplicates, 0 invalid lines, 1 ad network detected.

Ad networks in narrowfront.matterwardlabs.com/app-ads.txt

Google AdMob — accounts pub-4309386811073479, pub-2485899540395345: 2 lines in the file

Corrected file: narrowfront.matterwardlabs.com app-ads.txt (fixed).

FAQ

Does narrowfront.matterwardlabs.com have an app-ads.txt?

Yes — https://narrowfront.matterwardlabs.com/app-ads.txt has 2 lines (checked 19 Oct 2026).

Which ad networks does narrowfront.matterwardlabs.com work with?

Its app-ads.txt lists Google AdMob.

Is the app-ads.txt of narrowfront.matterwardlabs.com correct?