DET - Duolingo English Test
by Duolingo · 6754582936
Most of the 504 lines in DET - Duolingo English Test's app-ads.txt (englishtest.duolingo.com) are RESELLER lines: 479 against 25 DIRECT, across 121 ad systems. 417 of 496 lines checked against sellers.json match; 14 name a seller ID the network does not list, 19 declare the wrong seller type. The file last changed on 3 October 2026; the same file covers 2 apps of this developer.
Store data
- Rating
- 2.12
- Installs
- —
- Category
- Education
- Contains ads
- —
32 ratings
Not published by Apple
app-ads.txt
- Domain
- englishtest.duolingo.com
- Status
- Found (200)
- Lines
- 504
- DIRECT / RESELLER
- 25 / 479
- OWNERDOMAIN
- duolingo.com
- MANAGERDOMAIN
- aditude.io
- Parse errors
- 63
- Last fetched
- Oct 10, 2026
- Last changed
- Oct 3, 2026
sellers.json cross-check
504 lines checked
Verified
417
Errors
33
Warnings
50
- Seller ID not found 14
- DIRECT but intermediary 11
- RESELLER but publisher 8
- Seller type BOTH 45
- Confidential seller 1
- No sellers.json 4
- Unchecked 4
Declared supply tree
25 direct accounts across 21 direct sellers · 288 resellers buying from them · 191 not matched
| Direct seller | Accounts | Resold by | Issues |
|---|---|---|---|
| unity.com | 1 | 127 resellers: pubmatic.com, openx.com, pubnative.net … | 0 |
| vungle.com | 1 | 92 resellers: pubnative.net, video.unrulymedia.com, pubmatic.com … | 0 |
| cpmstar.com | 1 | 21 resellers: pubmatic.com, smartadserver.com, sharethrough.com … | 0 |
| risecodes.com | 1 | 15 resellers: sharethrough.com, video.unrulymedia.com, yieldmo.com … | 1 |
| tagoras.io | 1 | 5 resellers: pubmatic.com, media.net, gitberry.com … | 0 |
| google.com | 2 | 3 resellers: pubmatic.com, video.unrulymedia.com … | 0 |
| aps.amazon.com | 1 | 2 resellers: media.net, indexexchange.com | 1 |
| gumgum.com | 1 | 2 resellers: pubmatic.com, openx.com | 0 |
| media.net | 1 | 2 resellers: pubmatic.com, openx.com | 1 |
| sharethrough.com | 1 | 2 resellers: pubmatic.com, openx.com | 1 |
| smartadserver.com | 1 | 2 resellers: pubmatic.com, openx.com | 1 |
| aditude.io | 1 | 1 reseller: video.unrulymedia.com | 0 |
| + 9 more direct sellers in the full tree | |||
191 resellers, intermediary not matched to a direct seller of this app (not cross-checked yet: 2; account not found in the ad system's sellers.json: 13; the intermediary's domain is not a direct seller of this app: 163; the ad system publishes no usable sellers.json: 4; sellers.json lists the account as a publisher, not an intermediary: 8; the seller is confidential in sellers.json: 1).
Seller IDs the networks do not list
14 lines of this app-ads.txt name an account ID that the ad system's sellers.json does not contain. Usually a stale line or a typo in the ID. How to fix it
| Line | Ad system | Account ID | Relationship |
|---|---|---|---|
| 11 | rubiconproject.com | 28669 | DIRECT |
| 54 | adform.com | 3305 | RESELLER |
| 58 | openx.com | 560607116 | RESELLER |
| 59 | robust-apps.com | 499 | RESELLER |
| 60 | video.unrulymedia.com | 311396600 | RESELLER |
| 123 | appnexus.com | 10617 | RESELLER |
| 144 | indexexchange.com | 199195 | RESELLER |
| 156 | openx.com | 540861995 | RESELLER |
| 162 | orangeclickmedia.com | c-1181 | RESELLER |
| 189 | pubmatic.com | 161853 | RESELLER |
| 533 | smartstream.tv | 679 | RESELLER |
| 552 | themediagrid.com | RIX2M5 | RESELLER |
| 594 | video.unrulymedia.com | 5336134699710583737 | RESELLER |
| 607 | xandr.com | 10128 | RESELLER |
More apps from Duolingo
New to these files? What is app-ads.txt · Network directory · Glossary
Last crawled Sun, Oct 11, 2026 3:02 PM. Data derived from the public store listing, the developer's app-ads.txt and the ad systems' sellers.json files.