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.

hobbyistsoftware.com app-ads.txt check

hobbyistsoftware.com is missing out on higher CPMs: its app-ads.txt has 1 invalid line. Buyers' crawlers skip invalid lines, so those sellers can't be verified.

Checked 20 Oct 2026. 578 lines, 447 unique records, 73 duplicates, 1 invalid lines, 15 ad networks detected.

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

Mintegral — partner (reseller) lines only: 183 lines in the file, 400 expected lines missing
Unity Ads — partner (reseller) lines only: 11 lines in the file, 149 expected lines missing
ironSource / LevelPlay — partner (reseller) lines only: 15 lines in the file, 110 expected lines missing
Liftoff Monetize (Vungle) — partner (reseller) lines only: 48 lines in the file, 342 expected lines missing
Chartboost — partner (reseller) lines only: 78 lines in the file, 400 expected lines missing
InMobi — partner (reseller) lines only: 33 lines in the file, 238 expected lines missing
DT Exchange (Fyber) — partner (reseller) lines only: 25 lines in the file, 400 expected lines missing
VK Ads (myTarget) — partner (reseller) lines only: 47 lines in the file, 97 expected lines missing
BIGO Ads — partner (reseller) lines only: 32 lines in the file, 400 expected lines missing
Yango Ads — partner (reseller) lines only: 237 lines in the file, 400 expected lines missing
DSP Exchange — partner (reseller) lines only: 83 lines in the file, 400 expected lines missing
Maticoo (zMaticoo) — partner (reseller) lines only: 15 lines in the file, 400 expected lines missing
Verve (PubNative) — partner (reseller) lines only: 46 lines in the file, 400 expected lines missing
HyprMX — partner (reseller) lines only: 21 lines in the file, 348 expected lines missing
Bidmachine — partner (reseller) lines only: 58 lines in the file, 400 expected lines missing

Invalid lines

facebook.com, Business ID, RESELLER, c3e20eee3f780d68

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

FAQ

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

Yes — https://hobbyistsoftware.com/app-ads.txt has 578 lines (checked 20 Oct 2026).

Which ad networks does hobbyistsoftware.com work with?

Its app-ads.txt lists Mintegral, Unity Ads, ironSource / LevelPlay, Liftoff Monetize (Vungle), Chartboost, InMobi, DT Exchange (Fyber), VK Ads (myTarget), BIGO Ads, Yango Ads, DSP Exchange, Maticoo (zMaticoo) and 3 more.

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