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.

quizlet.com app-ads.txt check

quizlet.com achieves the best ad optimization: its app-ads.txt has no errors and matches what its 10 ad networks expect (100% of 24 lines).

Checked 20 Oct 2026. 235 lines, 173 unique records, 8 duplicates, 0 invalid lines, 26 ad networks detected.

Ad networks in quizlet.com/app-ads.txt

Amazon Publisher Services — account 2869fa5e-10aa-4d8b-a091-67086ef3e17b: 1 line in the file
Xandr (Microsoft) — account 10240: 1 line in the file
OpenX — accounts 540709731, 565070028, 540936405: 3 lines in the file
PubMatic — accounts 157661-A, 157286, 157661 and 2 more: 5 lines in the file
TripleLift — accounts 6633, 8004: 2 lines in the file
Yahoo — accounts 57094, 57527, 58907: 3 lines in the file
Index Exchange — accounts 193403, 188705, 191900 and 2 more: 5 lines in the file
Google AdMob — accounts pub-3482570618048850, pub-8871758525792542: 2 lines in the file
Magnite (Rubicon) — accounts 24194, 24196: 2 lines in the file
Sovrn — account 264549: 1 line in the file
AppLovin — partner (reseller) lines only: 8 lines in the file, 27 expected lines missing
Mintegral — partner (reseller) lines only: 43 lines in the file, 400 expected lines missing
Liftoff Monetize (Vungle) — partner (reseller) lines only: 18 lines in the file, 372 expected lines missing
Chartboost — partner (reseller) lines only: 35 lines in the file, 400 expected lines missing
DT Exchange (Fyber) — partner (reseller) lines only: 18 lines in the file, 400 expected lines missing
Yandex Ads — partner (reseller) lines only: 18 lines in the file, 150 expected lines missing
BIGO Ads — partner (reseller) lines only: 38 lines in the file, 400 expected lines missing
Yango Ads — partner (reseller) lines only: 75 lines in the file, 400 expected lines missing
DSP Exchange — partner (reseller) lines only: 23 lines in the file, 400 expected lines missing
Maticoo (zMaticoo) — partner (reseller) lines only: 21 lines in the file, 400 expected lines missing
Verve (PubNative) — partner (reseller) lines only: 40 lines in the file, 400 expected lines missing
HyprMX — partner (reseller) lines only: 16 lines in the file, 353 expected lines missing
Start.io — partner (reseller) lines only: 10 lines in the file, 147 expected lines missing
CAS.ai — partner (reseller) lines only: 19 lines in the file, 146 expected lines missing
DSail — partner (reseller) lines only: 19 lines in the file, 146 expected lines missing
Bidmachine — partner (reseller) lines only: 48 lines in the file, 400 expected lines missing

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

FAQ

Does quizlet.com have an app-ads.txt?

Yes — https://quizlet.com/app-ads.txt has 235 lines (checked 20 Oct 2026).

Which ad networks does quizlet.com work with?

Its app-ads.txt lists Amazon Publisher Services, Xandr (Microsoft), OpenX, PubMatic, TripleLift, Yahoo, Index Exchange, Google AdMob, Magnite (Rubicon), Sovrn, AppLovin, Mintegral and 14 more.

Is the app-ads.txt of quizlet.com correct?