# App Supply Index

> Public audit of mobile app supply chains: app-ads.txt checked against sellers.json, with line-level evidence.

Data as of 2026-10-07 (iOS top free + top grossing · US, GB, DE). 334 apps crawled, 120 graded. 13.6% of checked seller lines point to IDs the ad system's sellers.json doesn't list.

## Pages
- [All graded apps](apps)
- [Ad systems](ad-systems)
- [Methodology](methodology)
- App reports: app/<store>-<id>

## Data
- [apps.json](data/apps.json): grade, score and top issue per app
- [ad-systems.json](data/ad-systems.json): per ad system match rates

Findings are mechanical checks of public files, not fraud verdicts.