Ad system
firstimpression.io
firstimpression.io is the domain an ad system uses in app-ads.txt and ads.txt files. 33,795 apps in our data declare it. Its sellers.json lists 188 sellers.
- Apps declaring it
- 33,795
- Sellers in sellers.json
- 188
- Lines verified
- 87%
- Lines with errors
- 657
- Avg. supply path score
- 50.4 / 100
6,948 DIRECT · 32,849 RESELLER
0% confidential
4,447 of 5,105 checked lines
5,105 lines in total
33,623 apps scored
Apps and lines are recounted every 10 minutes. The sellers.json breakdown and the directory ranking are as of , recomputed daily. sellers.json last read 10 October 2026. The supply path score sums up how short and clean the declared paths are, 0 to 100 (how it is computed).
How to add firstimpression.io to app-ads.txt
One line per account, in the app-ads.txt at the root of the domain your App Store and Google Play listings name as the developer website.
firstimpression.io, YOUR_ACCOUNT_ID, DIRECT
firstimpression.io, YOUR_ACCOUNT_ID, RESELLER- Field 1:
firstimpression.io, the domain firstimpression.io uses in app-ads.txt. - Field 2: your account ID with firstimpression.io. It must equal the
seller_idin firstimpression.io's sellers.json. - Field 3: DIRECT if you hold the account, RESELLER if a partner holds it and sells your inventory. DIRECT vs RESELLER
- Field 4 (optional): a certification authority ID. Most lines naming firstimpression.io carry none, or different ones, so we do not suggest one.
sellers.json at a glance
- Status
- Published
- Sellers listed
- 188
- Confidential
- 0 (0%)
- Passthrough
- 0
- Removed, last 30 days
- 2
- Last read
- Oct 10, 2026
- PUBLISHER163
- INTERMEDIARY22
- BOTH3
Cross-check of lines naming firstimpression.io
- Verified 4,447
- Seller ID not found 215
- DIRECT but intermediary 7
- RESELLER but publisher 435
- Seller type BOTH 1
- Confidential seller 0
- No sellers.json 0
- Unchecked 0
Every line naming firstimpression.io is looked up in its sellers.json. What each status means
Common errors with firstimpression.io lines
-
RESELLER but publisher
435 lines
If the account is yours, declare it DIRECT. If a partner holds it, ask firstimpression.io why the account is listed as PUBLISHER.
-
Seller ID not found
215 lines
Ask firstimpression.io for the account ID it lists for you in its sellers.json, correct the line, or remove it if you no longer work with them. Buyers that check sellers.json drop these paths.
-
DIRECT but intermediary
7 lines
If a partner holds this account and resells your inventory, the line should say RESELLER. If the account is yours, ask firstimpression.io to list it as PUBLISHER.
-
Seller type BOTH
1 line
The account is listed as BOTH, so sellers.json alone cannot tell a buyer which relationship applies. Nothing to fix on your side; buyers usually look at the seller's domain.
Intermediaries most declared as RESELLER
Accounts on firstimpression.io that its sellers.json lists as INTERMEDIARY or BOTH, by the number of app-ads.txt files declaring them. Confidential sellers are left out.
| Seller domain | Type | Files |
|---|---|---|
| ignitemediatech.com | INTERMEDIARY | 2,158 |
| bidmachine.io | INTERMEDIARY | 1,738 |
| pubnative.net | INTERMEDIARY | 192 |
| mgid.com | INTERMEDIARY | 6 |
| velocity.io | INTERMEDIARY | 3 |
Apps that declare firstimpression.io
| App | Store | Relationship | Status |
|---|---|---|---|
| Android | RESELLER | Live | |
| Android | RESELLER | Live | |
| Android | RESELLER | Live | |
| Android | RESELLER | Live | |
| Android | RESELLER | Live | |
| Android | RESELLER | Live | |
| Android | RESELLER | Live | |
| Android | RESELLER | Live | |
| Android | RESELLER | Live | |
| Android | RESELLER | Live | |
| Android | RESELLER | Live | |
| Android | RESELLER | Live | |
| Android | RESELLER | Live | |
| Android | RESELLER | Live | |
| Android | RESELLER | Live | |
| Android | RESELLER | Live | |
| Android | RESELLER | Live | |
| Android | DIRECT + RESELLER | Live | |
| Android | RESELLER | Live | |
| Android | RESELLER | Live |
Questions about firstimpression.io
How do I add firstimpression.io to app-ads.txt?
Add one line for each account firstimpression.io gives you: "firstimpression.io, YOUR_ACCOUNT_ID, DIRECT". Use DIRECT when you hold the account yourself and RESELLER when a partner holds it and sells your inventory through firstimpression.io. The account ID must be the seller_id firstimpression.io lists for you in its sellers.json; firstimpression.io will give it to you. Put the file at the root of the domain named as your developer website in the App Store and Google Play listings.
Does firstimpression.io publish a sellers.json?
Yes. Its file at https://firstimpression.io/sellers.json listed 188 sellers when we last read it on 10 October 2026: 163 publishers, 22 intermediaries and 3 listed as both; 0% are confidential.
How many apps declare firstimpression.io in app-ads.txt?
33,795 apps in Stoqlab's data (delisted apps included) declare firstimpression.io: 6,948 with at least one DIRECT line and 32,849 with at least one RESELLER line, across 3,023 app-ads.txt files. Counts are recomputed daily.
Why do firstimpression.io lines fail verification?
Of 5,105 lines naming firstimpression.io, 657 contradict its sellers.json. The most common case is "RESELLER but publisher" (435 lines): If the account is yours, declare it DIRECT. If a partner holds it, ask firstimpression.io why the account is listed as PUBLISHER.
What is the difference between DIRECT and RESELLER?
DIRECT means the publisher owns the account; RESELLER means an intermediary sells the inventory on the publisher's behalf. DIRECT lines should match a PUBLISHER entry in the network's sellers.json, RESELLER lines an INTERMEDIARY entry.
Sources: the public app-ads.txt files of tracked apps and the sellers.json of firstimpression.io. Something wrong? Tell us.