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.

freeplay.io app-ads.txt check

freeplay.io is missing out on higher CPMs: its app-ads.txt has 8 invalid lines. Buyers' crawlers skip invalid lines, so those sellers can't be verified.

Checked 19 Oct 2026. 14,570 lines, 7,784 unique records, 6,584 duplicates, 8 invalid lines, 42 ad networks detected.

Ad networks in freeplay.io/app-ads.txt

AppLovin — account b22b6b7e1c5656662ff5b510e6f790b4: 36 lines in the file
Amazon Publisher Services — accounts 8cf26626-246f-4c54-ad2d-a208d1f491b1, 5d8ed25e-57cc-441a-b62a-127b34faae4e, 70247b00-ff8f-4016-b3ab-8344daf96e09: 3 lines in the file
InMobi — accounts 9590892ce3a14d8c923c062c518fe04f, 18eb7cf877c0416f997665697dceb723, 8f6a92b950834203a6df4fcd1c4a860f and 1 more: 226 lines in the file, 49 expected lines missing
MobileFuse — account 4561: 1 line in the file
PubMatic — accounts 166152, 156538, 160543 and 12 more: 15 lines in the file
Sovrn — accounts 567202, 224984, 237754 and 6 more: 9 lines in the file
Google AdMob — accounts pub-8236392776689719, pub-3940256099942544, pub-4076933686662947 and 2 more: 5 lines in the file
Liftoff Monetize (Vungle) — account 5fb510aa8072bf0015d8d59d: 362 lines in the file, 29 expected lines missing
Mintegral — account 24690: 400 lines in the file, 28 expected lines missing
Smaato — accounts 1100057546, 1100057628, 1100049012 and 13 more: 16 lines in the file
Maticoo (zMaticoo) — accounts 114490, 115617, 116664: 294 lines in the file, 153 expected lines missing
Magnite (Rubicon) — accounts 11106, 13510, 19652 and 11 more: 14 lines in the file
TikTok Ad Network (Pangle) — accounts 23855, 67962: 2 lines in the file
DT Exchange (Fyber) — account 214518: 400 lines in the file, 4 expected lines missing
Unity Ads — account 1466396: 157 lines in the file, 4 expected lines missing
ironSource / LevelPlay — account 317266: 114 lines in the file, 12 expected lines missing
TripleLift — accounts 8446, 8784-EB, 8784 and 9 more: 12 lines in the file
Display.io — accounts 2520, 173162: 25 lines in the file, 9 expected lines missing
Bidmachine — accounts 322, 1189: 400 lines in the file, 338 expected lines missing
Ogury — accounts 5bbe7af9-d51f-499e-a804-db54798d96f4, 617c5f02-17ff-4106-a0b6-d16226f89495: 12 lines in the file, 7 expected lines missing
Criteo — accounts B-066465, B-059025, B-060738 and 3 more: 6 lines in the file
Xandr (Microsoft) — accounts 14808, 15799, 16912 and 5 more: 8 lines in the file
Index Exchange — accounts 183921, 188416, 193067 and 1 more: 4 lines in the file
OpenX — accounts 540134228, 540225743, 540861995 and 2 more: 5 lines in the file
Yahoo — accounts 55305, 58855, 59435 and 1 more: 4 lines in the file
VK Ads (myTarget) — account 4296618: 141 lines in the file, 34 expected lines missing
BIGO Ads — accounts cauq6iw3wn, 1116276: 400 lines in the file, 18 expected lines missing
Verve (PubNative) — account 1009360: 400 lines in the file, 36 expected lines missing
Start.io — account 113967750: 141 lines in the file, 17 expected lines missing
BlueSea — accounts 7138144, 7138153: 29 lines in the file, 10 expected lines missing
DSail — account freeplay: 149 lines in the file, 17 expected lines missing
Chartboost — partner (reseller) lines only: 400 lines in the file, 98 expected lines missing
Yandex Ads — partner (reseller) lines only: 152 lines in the file, 16 expected lines missing
Yango Ads — partner (reseller) lines only: 400 lines in the file, 400 expected lines missing
Bidease — partner (reseller) lines only: 48 lines in the file, 1 expected line missing
DSP Exchange — partner (reseller) lines only: 378 lines in the file, 183 expected lines missing
Madex — partner (reseller) lines only: 9 lines in the file, 9 expected lines missing
Monetrix — partner (reseller) lines only: 58 lines in the file, 35 expected lines missing
Prado — partner (reseller) lines only: 21 lines in the file, 6 expected lines missing
HyprMX — partner (reseller) lines only: 277 lines in the file, 92 expected lines missing
Kidoz — partner (reseller) lines only: 17 lines in the file, 5 expected lines missing
CAS.ai — partner (reseller) lines only: 148 lines in the file, 17 expected lines missing

Invalid lines

freewheel.tv, sg1258340,
singularads, 548745, RESELLER
singularads, 225023, RESELLER
rubiconprojectcom, 25872, reseller, 0bfd66d529a55807
singularads, 556985, direct
app-stock.com, 509221, Reseller, ed8c126ea5971415 (optional)
Media.net, 8CU65V935, RESELLERxandr.com, 11316, RESELLER
admanmedia, 35, RESELLER

Corrected file: freeplay.io app-ads.txt (fixed).

FAQ

Does freeplay.io have an app-ads.txt?

Yes — https://freeplay.io/app-ads.txt has 14,570 lines (checked 19 Oct 2026).

Which ad networks does freeplay.io work with?

Its app-ads.txt lists AppLovin, Amazon Publisher Services, InMobi, MobileFuse, PubMatic, Sovrn, Google AdMob, Liftoff Monetize (Vungle), Mintegral, Smaato, Maticoo (zMaticoo), Magnite (Rubicon) and 30 more.

Is the app-ads.txt of freeplay.io correct?