> Buyers find app-ads.txt through the developer website in your app's store listing. Without that URL there's nowhere to look, so the app's ad supply can't be verified.

Source: https://appsupplyindex.com/fix/no-developer-website · Updated: 2026-10-07 · License: CC BY 4.0 (App Supply Index)

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[Learn](https://appsupplyindex.com/learn/) · How to fix

# Why does app-ads.txt need a developer website in the store listing?

Updated Oct 7, 2026 · data from 12 App Store genres · top free + top grossing charts · US · iOS + Android

**Short answer:** Buyers find app-ads.txt through the developer website in your app's store listing. Without that URL there's nowhere to look, so the app's ad supply can't be verified.

**0 of 883**
ad-monetized top US apps in this index have this finding (0%)

## Why it matters

An app that sells ads without a developer URL is effectively invisible to app-ads.txt checks.

## How to fix it

1. Add your developer website in App Store Connect and Google Play Console.
2. Publish app-ads.txt at the root of that domain.

## Related

- [What is app-ads.txt?](https://appsupplyindex.com/learn/what-is-app-ads-txt)
- [DIRECT vs RESELLER](https://appsupplyindex.com/learn/direct-vs-reseller)
- [How the index checks files](https://appsupplyindex.com/methodology)

Based on the [IAB Tech Lab
ads.txt/app-ads.txt](https://iabtechlab.com/ads-txt/) and [sellers.json](https://iabtechlab.com/sellers-json/)
specifications. Numbers are automated observations of public files on the date above.